feat: first

internal/health/health_test.go

@@ -0,0 +1,115 @@
+package health
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHealthHandler_ServeHTTP(t *testing.T) {
+	tests := []struct {
+		name           string
+		method         string
+		checkers       []HealthChecker
+		expectedStatus int
+		expectedHealth string
+	}{
+		{
+			name:           "GET request with no checkers",
+			method:         "GET",
+			checkers:       []HealthChecker{},
+			expectedStatus: http.StatusOK,
+			expectedHealth: "ok",
+		},
+		{
+			name:   "GET request with healthy checker",
+			method: "GET",
+			checkers: []HealthChecker{
+				NewSimpleChecker("test", func() error { return nil }),
+			},
+			expectedStatus: http.StatusOK,
+			expectedHealth: "ok",
+		},
+		{
+			name:   "GET request with unhealthy checker",
+			method: "GET",
+			checkers: []HealthChecker{
+				NewSimpleChecker("test", func() error { return errors.New("test error") }),
+			},
+			expectedStatus: http.StatusServiceUnavailable,
+			expectedHealth: "error",
+		},
+		{
+			name:           "POST request should return 405",
+			method:         "POST",
+			checkers:       []HealthChecker{},
+			expectedStatus: http.StatusMethodNotAllowed,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			handler := NewHandler("1.0.0")
+			for _, checker := range tt.checkers {
+				handler.AddCheck(checker)
+			}
+
+			req := httptest.NewRequest(tt.method, "/health", nil)
+			w := httptest.NewRecorder()
+
+			handler.ServeHTTP(w, req)
+
+			if w.Code != tt.expectedStatus {
+				t.Errorf("expected status %d, got %d", tt.expectedStatus, w.Code)
+			}
+
+			if tt.method == "GET" && tt.expectedStatus != http.StatusMethodNotAllowed {
+				var response Response
+				if err := json.NewDecoder(w.Body).Decode(&response); err != nil {
+					t.Fatalf("failed to decode response: %v", err)
+				}
+
+				if response.Status != tt.expectedHealth {
+					t.Errorf("expected status %s, got %s", tt.expectedHealth, response.Status)
+				}
+
+				if response.Version != "1.0.0" {
+					t.Errorf("expected version 1.0.0, got %s", response.Version)
+				}
+
+				if len(response.Checks) != len(tt.checkers) {
+					t.Errorf("expected %d checks, got %d", len(tt.checkers), len(response.Checks))
+				}
+			}
+		})
+	}
+}
+
+func TestSimpleChecker(t *testing.T) {
+	t.Run("healthy checker", func(t *testing.T) {
+		checker := NewSimpleChecker("test", func() error { return nil })
+		
+		if checker.Name() != "test" {
+			t.Errorf("expected name 'test', got %s", checker.Name())
+		}
+		
+		if err := checker.Check(); err != nil {
+			t.Errorf("expected no error, got %v", err)
+		}
+	})
+
+	t.Run("unhealthy checker", func(t *testing.T) {
+		testErr := errors.New("test error")
+		checker := NewSimpleChecker("test", func() error { return testErr })
+		
+		if checker.Name() != "test" {
+			t.Errorf("expected name 'test', got %s", checker.Name())
+		}
+		
+		if err := checker.Check(); err != testErr {
+			t.Errorf("expected error %v, got %v", testErr, err)
+		}
+	})
+}