diff --git a/.travis.yml b/.travis.yml
index 30895c7..1fb1232 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,21 +2,25 @@ language: scala
 
 jdk: openjdk8
 
-node_js:
-  - 14
-
 scala:
   - 2.13.2
 
 before_install:
+  - curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
+  - export NVM_DIR="$HOME/.nvm"
+  - nvm install node
+  - nvm use node
+  - nvm alias default node
   - npm install
 script:
   - sbt ++$TRAVIS_SCALA_VERSION clean coverage test coverageReport
+  - bash <(curl -s https://codecov.io/bash) -cF scala
+  - npm test -- --coverage --collectCoverageFrom=src/main/resources/dashboard/*.jsx
+  - bash <(curl -s https://codecov.io/bash) -cF javascript
   - sbt assembly
   - sbt docker:publishLocal
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
   - docker build -t docker.pkg.github.com/amanjpro/greenish/greenish:$TRAVIS_TAG target/docker/stage
   - echo $GITHUB_RELEASES_TOKEN | docker login https://docker.pkg.github.com -u amanjpro --password-stdin
   - docker push docker.pkg.github.com/amanjpro/greenish/greenish:$TRAVIS_TAG
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..a58820a
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,4 @@
+module.exports = {
+  presets: ['@babel/preset-env', '@babel/preset-react'],
+  plugins: ["@babel/plugin-proposal-class-properties"]
+};
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..18d60d2
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,24 @@
+const {defaults} = require('jest-config');
+
+module.exports = {
+  verbose: true,
+  collectCoverage: true,
+  coverageReporters: ["json", "html"],
+  transform: {
+    "^.+\\.jsx?$": "babel-jest"
+  },
+  roots: [
+    "<rootDir>",
+     "<rootDir>src/main/resources/dashboard"
+  ],
+  moduleDirectories: [
+    "node_modules",
+  ],
+  "moduleNameMapper": {
+     "^./(.*)_container.js$": "<rootDir>src/main/resources/dashboard/$1_container.jsx",
+     "^./resources/(.*).js$": "<rootDir>/src/test/resources/json-samples/$1.js"
+  },
+  "setupFilesAfterEnv": [
+    "<rootDir>/jest.setup.js"
+  ]
+};
diff --git a/jest.setup.js b/jest.setup.js
new file mode 100644
index 0000000..b87443b
--- /dev/null
+++ b/jest.setup.js
@@ -0,0 +1,6 @@
+import React from 'react';
+
+import { configure } from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+configure({ adapter: new Adapter() });
diff --git a/package.json b/package.json
index 7ea1f32..064817c 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,18 @@
   "name": "greenish",
   "version": "1.4.0-SNAPSHOT",
   "devDependencies": {
+    "@babel/preset-env": "^7.0.0",
+    "@babel/preset-react": "^7.0.0",
     "babel-cli": "^6.0.0",
-    "babel-preset-react-app": "^3.0.0"
+    "babel-plugin-transform-class-properties": "^6.24.1",
+    "babel-preset-react-app": "^3.0.0",
+    "enzyme": "^3.11.0",
+    "enzyme-adapter-react-16": "^1.15.2",
+    "jest": "^26.1.0",
+    "react": "^16.0.0",
+    "react-dom": "^16.0.0"
+  },
+  "scripts": {
+    "test": "jest"
   }
 }
diff --git a/src/main/resources/dashboard/group_container.jsx b/src/main/resources/dashboard/group_container.jsx
index 2ad0cb7..8850c4f 100644
--- a/src/main/resources/dashboard/group_container.jsx
+++ b/src/main/resources/dashboard/group_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class GroupContainer extends React.Component {
   intervalID
   constructor(props) {
@@ -68,3 +70,5 @@ class GroupContainer extends React.Component {
     }
   }
 }
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/job_container.jsx b/src/main/resources/dashboard/job_container.jsx
index 74fb7f0..6b5149b 100644
--- a/src/main/resources/dashboard/job_container.jsx
+++ b/src/main/resources/dashboard/job_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class JobContainer extends React.Component {
   intervalID
   constructor(props) {
@@ -71,3 +73,5 @@ class JobContainer extends React.Component {
     }
   }
 }
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/main_container.jsx b/src/main/resources/dashboard/main_container.jsx
index d317f98..f52e472 100644
--- a/src/main/resources/dashboard/main_container.jsx
+++ b/src/main/resources/dashboard/main_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 const e = React.createElement;
 
 class MainContainer extends React.Component {
@@ -81,3 +83,5 @@ class MainContainer extends React.Component {
 
 const domContainer = document.querySelector('#main_container');
 ReactDOM.render(e(MainContainer), domContainer);
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/state_container.jsx b/src/main/resources/dashboard/state_container.jsx
index f682e63..a2b3b1c 100644
--- a/src/main/resources/dashboard/state_container.jsx
+++ b/src/main/resources/dashboard/state_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class StateContainer extends React.Component {
   intervalID
   constructor(props) {
@@ -60,3 +62,5 @@ class StateContainer extends React.Component {
     }
   }
 }
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/summary_container.jsx b/src/main/resources/dashboard/summary_container.jsx
index 2740f82..56a36b6 100644
--- a/src/main/resources/dashboard/summary_container.jsx
+++ b/src/main/resources/dashboard/summary_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class SummaryContainer extends React.Component {
   intervalID
   constructor(props) {
@@ -105,3 +107,5 @@ class SummaryContainer extends React.Component {
     }
   }
 }
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/time_container.jsx b/src/main/resources/dashboard/time_container.jsx
index a50b50b..de218c2 100644
--- a/src/main/resources/dashboard/time_container.jsx
+++ b/src/main/resources/dashboard/time_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class TimeContainer extends React.Component {
   intervalID
   constructor(props) {
@@ -30,3 +32,5 @@ class TimeContainer extends React.Component {
     )
   }
 }
+
+export default VersionContainer;
diff --git a/src/main/resources/dashboard/version_container.jsx b/src/main/resources/dashboard/version_container.jsx
index 9d33568..f0f6450 100644
--- a/src/main/resources/dashboard/version_container.jsx
+++ b/src/main/resources/dashboard/version_container.jsx
@@ -1,3 +1,5 @@
+import React from 'react';
+
 class VersionContainer extends React.Component {
   constructor(props) {
     super(props);
@@ -51,3 +53,5 @@ class VersionContainer extends React.Component {
     }
   }
 }
+
+export default VersionContainer;
diff --git a/src/test/js/version_container.test.js b/src/test/js/version_container.test.js
new file mode 100644
index 0000000..aa7c7b9
--- /dev/null
+++ b/src/test/js/version_container.test.js
@@ -0,0 +1,95 @@
+import React from 'react';
+
+import { shallow } from 'enzyme';
+
+import VersionContainer from './version_container.js';
+
+import { testObject } from './resources/system.js';
+
+describe('VersionContainer', () => {
+  it('fetches version from server when server returns a successful response', done => {
+    const mockSuccessResponse = {};
+    const mockJsonPromise = Promise.resolve(testObject);
+    const mockFetchPromise = Promise.resolve({
+      json: () => mockJsonPromise,
+    });
+    global.fetch = jest.fn().mockImplementation(() => mockFetchPromise);
+
+    const wrapper = shallow(<VersionContainer/>);
+
+    expect(global.fetch).toHaveBeenCalledTimes(1);
+    expect(global.fetch).toHaveBeenCalledWith('/system');
+
+    process.nextTick(() => {
+      expect(wrapper.state()).toEqual({
+        "error": null,
+        "isLoaded": true,
+        "version": "1.4.0-SNAPSHOT"
+      });
+
+      var rendered = wrapper.find('em').render();
+      expect(rendered.text()).toContain("1.4.0-SNAPSHOT")
+
+      global.fetch.mockClear();
+      delete global.fetch;
+      done();
+    });
+  });
+
+  it('shows error, when a bad json is returned from API', done => {
+    const mockSuccessResponse = {};
+    const mockJsonPromise = Promise.reject({"nah": "bad"});
+    const mockFetchPromise = Promise.resolve({
+      json: () => mockJsonPromise,
+    });
+    global.fetch = jest.fn().mockImplementation(() => mockFetchPromise);
+
+    const wrapper = shallow(<VersionContainer/>);
+
+    expect(global.fetch).toHaveBeenCalledTimes(1);
+    expect(global.fetch).toHaveBeenCalledWith('/system');
+
+    process.nextTick(() => {
+      expect(wrapper.state()).toEqual({
+        "error": {"nah": "bad"},
+        "isLoaded": true,
+        "version": null,
+      });
+
+      var rendered = wrapper.find('em').render();
+      expect(rendered.text()).toContain("Error")
+
+
+      global.fetch.mockClear();
+      delete global.fetch;
+      done();
+    });
+  });
+
+  it('shows loading, before loading is done', done => {
+    const mockSuccessResponse = {};
+    const mockFetchPromise = new Promise(resolve => setTimeout(resolve, 1000))
+    global.fetch = jest.fn().mockImplementation(() => mockFetchPromise);
+
+    const wrapper = shallow(<VersionContainer/>);
+
+    expect(global.fetch).toHaveBeenCalledTimes(1);
+    expect(global.fetch).toHaveBeenCalledWith('/system');
+
+    process.nextTick(() => {
+      expect(wrapper.state()).toEqual({
+        "error": null,
+        "isLoaded": false,
+        "version": null,
+      });
+
+      var rendered = wrapper.find('em').render();
+      expect(rendered.text()).toContain("Loading")
+
+
+      global.fetch.mockClear();
+      delete global.fetch;
+      done();
+    });
+  });
+});
diff --git a/src/test/resources/json-samples/group.js b/src/test/resources/json-samples/group.js
new file mode 100644
index 0000000..09e430e
--- /dev/null
+++ b/src/test/resources/json-samples/group.js
@@ -0,0 +1,290 @@
+module.exports = {
+  "testObject": {
+    {
+      "group": {
+        "group_id": 0,
+        "name": "Reporting Hourly Jobs",
+        "jobs": [
+          {
+            "job_id": 0,
+            "name": "Raw event logs",
+            "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 0,
+              "normal": 1,
+              "warn": 2,
+              "critical": 3
+            },
+            "env": []
+          },
+          {
+            "job_id": 1,
+            "name": "Processed logs",
+            "prometheus_id": "reporting_hourly_jobs_processed_logs",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 1,
+              "normal": 2,
+              "warn": 3,
+              "critical": 4
+            },
+            "env": []
+          },
+          {
+            "job_id": 2,
+            "name": "Summary metrics",
+            "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 0,
+              "normal": 1,
+              "warn": 2,
+              "critical": 3
+            },
+            "env": []
+          },
+          {
+            "job_id": 3,
+            "name": "Summary report",
+            "prometheus_id": "reporting_hourly_jobs_summary_report",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 1,
+              "normal": 2,
+              "warn": 3,
+              "critical": 4
+            },
+            "env": []
+          }
+        ]
+      },
+      "status": [
+        {
+          "job": {
+            "job_id": 0,
+            "name": "Raw event logs",
+            "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 0,
+              "normal": 1,
+              "warn": 2,
+              "critical": 3
+            },
+            "env": []
+          },
+          "updated_at": 1595126730945,
+          "period_health": [
+            {
+              "period": "2020-07-18-20",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-21",
+              "ok": false
+            },
+            {
+              "period": "2020-07-18-22",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-23",
+              "ok": true
+            },
+            {
+              "period": "2020-07-19-00",
+              "ok": false
+            },
+            {
+              "period": "2020-07-19-01",
+              "ok": false
+            }
+          ]
+        },
+        {
+          "job": {
+            "job_id": 1,
+            "name": "Processed logs",
+            "prometheus_id": "reporting_hourly_jobs_processed_logs",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 1,
+              "normal": 2,
+              "warn": 3,
+              "critical": 4
+            },
+            "env": []
+          },
+          "updated_at": 1595126730945,
+          "period_health": [
+            {
+              "period": "2020-07-18-20",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-21",
+              "ok": false
+            },
+            {
+              "period": "2020-07-18-22",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-23",
+              "ok": true
+            },
+            {
+              "period": "2020-07-19-00",
+              "ok": false
+            },
+            {
+              "period": "2020-07-19-01",
+              "ok": false
+            }
+          ]
+        },
+        {
+          "job": {
+            "job_id": 2,
+            "name": "Summary metrics",
+            "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 0,
+              "normal": 1,
+              "warn": 2,
+              "critical": 3
+            },
+            "env": []
+          },
+          "updated_at": 1595126730945,
+          "period_health": [
+            {
+              "period": "2020-07-18-20",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-21",
+              "ok": false
+            },
+            {
+              "period": "2020-07-18-22",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-23",
+              "ok": true
+            },
+            {
+              "period": "2020-07-19-00",
+              "ok": false
+            },
+            {
+              "period": "2020-07-19-01",
+              "ok": false
+            }
+          ]
+        },
+        {
+          "job": {
+            "job_id": 3,
+            "name": "Summary report",
+            "prometheus_id": "reporting_hourly_jobs_summary_report",
+            "cmd": "/tmp/check /tmp",
+            "time_pattern": "yyyy-MM-dd-HH",
+            "frequency": "hourly",
+            "period_check_offset": 1,
+            "timezone": {
+              "zone_id": "UTC"
+            },
+            "lookback": 6,
+            "alert_levels": {
+              "great": 1,
+              "normal": 2,
+              "warn": 3,
+              "critical": 4
+            },
+            "env": []
+          },
+          "updated_at": 1595126730945,
+          "period_health": [
+            {
+              "period": "2020-07-18-20",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-21",
+              "ok": false
+            },
+            {
+              "period": "2020-07-18-22",
+              "ok": true
+            },
+            {
+              "period": "2020-07-18-23",
+              "ok": true
+            },
+            {
+              "period": "2020-07-19-00",
+              "ok": false
+            },
+            {
+              "period": "2020-07-19-01",
+              "ok": false
+            }
+          ]
+        }
+      ]
+    }
+  }
+}
diff --git a/src/test/resources/json-samples/job.js b/src/test/resources/json-samples/job.js
new file mode 100644
index 0000000..78cb03e
--- /dev/null
+++ b/src/test/resources/json-samples/job.js
@@ -0,0 +1,53 @@
+module.exports = {
+  "testObject": {
+    {
+      "job": {
+        "job_id": 0,
+        "name": "Raw event logs",
+        "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+        "cmd": "/tmp/check /tmp",
+        "time_pattern": "yyyy-MM-dd-HH",
+        "frequency": "hourly",
+        "period_check_offset": 1,
+        "timezone": {
+          "zone_id": "UTC"
+        },
+        "lookback": 6,
+        "alert_levels": {
+          "great": 0,
+          "normal": 1,
+          "warn": 2,
+          "critical": 3
+        },
+        "env": []
+      },
+      "updated_at": 1595126730945,
+      "period_health": [
+        {
+          "period": "2020-07-18-20",
+          "ok": true
+        },
+        {
+          "period": "2020-07-18-21",
+          "ok": false
+        },
+        {
+          "period": "2020-07-18-22",
+          "ok": true
+        },
+        {
+          "period": "2020-07-18-23",
+          "ok": true
+        },
+        {
+          "period": "2020-07-19-00",
+          "ok": false
+        },
+        {
+          "period": "2020-07-19-01",
+          "ok": false
+        }
+      ]
+    }
+  }
+}
diff --git a/src/test/resources/json-samples/maxlag.js b/src/test/resources/json-samples/maxlag.js
new file mode 100644
index 0000000..ff6d227
--- /dev/null
+++ b/src/test/resources/json-samples/maxlag.js
@@ -0,0 +1,7 @@
+module.exports = {
+  "testObject": {
+    {
+      "lag": 3
+    }
+  }
+}
diff --git a/src/test/resources/json-samples/missing.js b/src/test/resources/json-samples/missing.js
new file mode 100644
index 0000000..ecb3bc8
--- /dev/null
+++ b/src/test/resources/json-samples/missing.js
@@ -0,0 +1,476 @@
+module.exports = {
+  "testObject": {
+    [
+      {
+        "group": {
+          "group_id": 0,
+          "name": "Reporting Hourly Jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Raw event logs",
+              "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Processed logs",
+              "prometheus_id": "reporting_hourly_jobs_processed_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            {
+              "job_id": 2,
+              "name": "Summary metrics",
+              "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 3,
+              "name": "Summary report",
+              "prometheus_id": "reporting_hourly_jobs_summary_report",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Raw event logs",
+              "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Processed logs",
+              "prometheus_id": "reporting_hourly_jobs_processed_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 2,
+              "name": "Summary metrics",
+              "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 3,
+              "name": "Summary report",
+              "prometheus_id": "reporting_hourly_jobs_summary_report",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "group": {
+          "group_id": 1,
+          "name": "Nighly jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Even log compacter",
+              "prometheus_id": "nighly_jobs_even_log_compacter",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 2,
+                "normal": 3,
+                "warn": 4,
+                "critical": 5
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Event log archiver",
+              "prometheus_id": "nighly_jobs_event_log_archiver",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 3,
+                "normal": 4,
+                "warn": 5,
+                "critical": 6
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Even log compacter",
+              "prometheus_id": "nighly_jobs_even_log_compacter",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 2,
+                "normal": 3,
+                "warn": 4,
+                "critical": 5
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-13",
+                "ok": false
+              },
+              {
+                "period": "2020-07-17",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Event log archiver",
+              "prometheus_id": "nighly_jobs_event_log_archiver",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 3,
+                "normal": 4,
+                "warn": 5,
+                "critical": 6
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-13",
+                "ok": false
+              },
+              {
+                "period": "2020-07-17",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18",
+                "ok": false
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "group": {
+          "group_id": 2,
+          "name": "Monthly jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Billing reports",
+              "prometheus_id": "monthly_jobs_billing_reports",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Exporter jobs",
+              "prometheus_id": "monthly_jobs_exporter_jobs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Billing reports",
+              "prometheus_id": "monthly_jobs_billing_reports",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Exporter jobs",
+              "prometheus_id": "monthly_jobs_exporter_jobs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-01",
+                "ok": false
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}
diff --git a/src/test/resources/json-samples/state.js b/src/test/resources/json-samples/state.js
new file mode 100644
index 0000000..57400b7
--- /dev/null
+++ b/src/test/resources/json-samples/state.js
@@ -0,0 +1,588 @@
+module.exports = {
+  "testObject": {
+    [
+      {
+        "group": {
+          "group_id": 0,
+          "name": "Reporting Hourly Jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Raw event logs",
+              "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Processed logs",
+              "prometheus_id": "reporting_hourly_jobs_processed_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            {
+              "job_id": 2,
+              "name": "Summary metrics",
+              "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 3,
+              "name": "Summary report",
+              "prometheus_id": "reporting_hourly_jobs_summary_report",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Raw event logs",
+              "prometheus_id": "reporting_hourly_jobs_raw_event_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-20",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18-22",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-23",
+                "ok": true
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Processed logs",
+              "prometheus_id": "reporting_hourly_jobs_processed_logs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-20",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18-22",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-23",
+                "ok": true
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 2,
+              "name": "Summary metrics",
+              "prometheus_id": "reporting_hourly_jobs_summary_metrics",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-20",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18-22",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-23",
+                "ok": true
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 3,
+              "name": "Summary report",
+              "prometheus_id": "reporting_hourly_jobs_summary_report",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd-HH",
+              "frequency": "hourly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 1,
+                "normal": 2,
+                "warn": 3,
+                "critical": 4
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-18-20",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-21",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18-22",
+                "ok": true
+              },
+              {
+                "period": "2020-07-18-23",
+                "ok": true
+              },
+              {
+                "period": "2020-07-19-00",
+                "ok": false
+              },
+              {
+                "period": "2020-07-19-01",
+                "ok": false
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "group": {
+          "group_id": 1,
+          "name": "Nighly jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Even log compacter",
+              "prometheus_id": "nighly_jobs_even_log_compacter",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 2,
+                "normal": 3,
+                "warn": 4,
+                "critical": 5
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Event log archiver",
+              "prometheus_id": "nighly_jobs_event_log_archiver",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 3,
+                "normal": 4,
+                "warn": 5,
+                "critical": 6
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Even log compacter",
+              "prometheus_id": "nighly_jobs_even_log_compacter",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 2,
+                "normal": 3,
+                "warn": 4,
+                "critical": 5
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-13",
+                "ok": false
+              },
+              {
+                "period": "2020-07-14",
+                "ok": true
+              },
+              {
+                "period": "2020-07-15",
+                "ok": true
+              },
+              {
+                "period": "2020-07-16",
+                "ok": true
+              },
+              {
+                "period": "2020-07-17",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18",
+                "ok": false
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Event log archiver",
+              "prometheus_id": "nighly_jobs_event_log_archiver",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM-dd",
+              "frequency": "daily",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 3,
+                "normal": 4,
+                "warn": 5,
+                "critical": 6
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-07-13",
+                "ok": false
+              },
+              {
+                "period": "2020-07-14",
+                "ok": true
+              },
+              {
+                "period": "2020-07-15",
+                "ok": true
+              },
+              {
+                "period": "2020-07-16",
+                "ok": true
+              },
+              {
+                "period": "2020-07-17",
+                "ok": false
+              },
+              {
+                "period": "2020-07-18",
+                "ok": false
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "group": {
+          "group_id": 2,
+          "name": "Monthly jobs",
+          "jobs": [
+            {
+              "job_id": 0,
+              "name": "Billing reports",
+              "prometheus_id": "monthly_jobs_billing_reports",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            {
+              "job_id": 1,
+              "name": "Exporter jobs",
+              "prometheus_id": "monthly_jobs_exporter_jobs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            }
+          ]
+        },
+        "status": [
+          {
+            "job": {
+              "job_id": 0,
+              "name": "Billing reports",
+              "prometheus_id": "monthly_jobs_billing_reports",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-01",
+                "ok": false
+              },
+              {
+                "period": "2020-02",
+                "ok": true
+              },
+              {
+                "period": "2020-03",
+                "ok": true
+              },
+              {
+                "period": "2020-04",
+                "ok": true
+              },
+              {
+                "period": "2020-05",
+                "ok": true
+              },
+              {
+                "period": "2020-06",
+                "ok": true
+              }
+            ]
+          },
+          {
+            "job": {
+              "job_id": 1,
+              "name": "Exporter jobs",
+              "prometheus_id": "monthly_jobs_exporter_jobs",
+              "cmd": "/tmp/check /tmp",
+              "time_pattern": "yyyy-MM",
+              "frequency": "monthly",
+              "period_check_offset": 1,
+              "timezone": {
+                "zone_id": "UTC"
+              },
+              "lookback": 6,
+              "alert_levels": {
+                "great": 0,
+                "normal": 1,
+                "warn": 2,
+                "critical": 3
+              },
+              "env": []
+            },
+            "updated_at": 1595126670907,
+            "period_health": [
+              {
+                "period": "2020-01",
+                "ok": false
+              },
+              {
+                "period": "2020-02",
+                "ok": true
+              },
+              {
+                "period": "2020-03",
+                "ok": true
+              },
+              {
+                "period": "2020-04",
+                "ok": true
+              },
+              {
+                "period": "2020-05",
+                "ok": true
+              },
+              {
+                "period": "2020-06",
+                "ok": true
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}
diff --git a/src/test/resources/json-samples/summary.js b/src/test/resources/json-samples/summary.js
new file mode 100644
index 0000000..bff9f5a
--- /dev/null
+++ b/src/test/resources/json-samples/summary.js
@@ -0,0 +1,72 @@
+module.exports = {
+  "testObject": {
+    [
+      {
+        "group_id": 0,
+        "name": "Reporting Hourly Jobs",
+        "status": [
+          {
+            "job_id": 0,
+            "name": "Raw event logs",
+            "missing": 3,
+            "alert_level": "critical"
+          },
+          {
+            "job_id": 1,
+            "name": "Processed logs",
+            "missing": 3,
+            "alert_level": "warn"
+          },
+          {
+            "job_id": 2,
+            "name": "Summary metrics",
+            "missing": 3,
+            "alert_level": "critical"
+          },
+          {
+            "job_id": 3,
+            "name": "Summary report",
+            "missing": 3,
+            "alert_level": "warn"
+          }
+        ]
+      },
+      {
+        "group_id": 1,
+        "name": "Nighly jobs",
+        "status": [
+          {
+            "job_id": 0,
+            "name": "Even log compacter",
+            "missing": 3,
+            "alert_level": "normal"
+          },
+          {
+            "job_id": 1,
+            "name": "Event log archiver",
+            "missing": 3,
+            "alert_level": "great"
+          }
+        ]
+      },
+      {
+        "group_id": 2,
+        "name": "Monthly jobs",
+        "status": [
+          {
+            "job_id": 0,
+            "name": "Billing reports",
+            "missing": 1,
+            "alert_level": "normal"
+          },
+          {
+            "job_id": 1,
+            "name": "Exporter jobs",
+            "missing": 1,
+            "alert_level": "normal"
+          }
+        ]
+      }
+    ]
+  }
+}
diff --git a/src/test/resources/json-samples/system.js b/src/test/resources/json-samples/system.js
new file mode 100644
index 0000000..fdf7aae
--- /dev/null
+++ b/src/test/resources/json-samples/system.js
@@ -0,0 +1,7 @@
+module.exports = {
+  "testObject": {
+    "service":"Greenish",
+    "version":"1.4.0-SNAPSHOT",
+    "uptime":1707873
+  }
+};