test(auth): enable login tests using httptest server

auth_test.go

@@ -5,6 +5,8 @@ package logchimp_test
 import (
 	"context"
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"testing"
 
@@ -39,6 +41,46 @@ func TestAuthLogin(t *testing.T) {
 	}
 }
 
+// Without the prism server, we can mock the response for testing purposes.
+// This is useful for unit tests where we want to simulate the server's response without needing a live server.
+func TestAuthLogin_MockServer(t *testing.T) {
+	mock := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/auth/login" {
+			t.Fatalf("wrong endpoint: %s", r.URL.Path)
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{
+			"user": {
+				"email": "mock@example.com",
+				"authToken": "abc123",
+				"name": "Mock User",
+				"userId": "1",
+				"username": "mock"
+			}
+		}`))
+	}))
+	defer mock.Close()
+
+	client := logchimp.NewClient(
+		option.WithBaseURL(mock.URL),
+	)
+
+	resp, err := client.Auth.Login(context.TODO(), logchimp.AuthLoginParams{
+		Email:    "mock@example.com",
+		Password: "pass",
+	})
+
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+
+	if resp.User.Email != "mock@example.com" {
+		t.Errorf("got %s, want mock@example.com", resp.User.Email)
+	}
+}
+
 func TestAuthSignup(t *testing.T) {
 	t.Skip("Prism tests are disabled")
 	baseURL := "http://localhost:4010"