feat(coderd): add DERP healthcheck (#6936)

coderd/debug_test.go

@@ -0,0 +1,69 @@
+package coderd_test
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/coderd/coderdtest"
+	"github.com/coder/coder/coderd/healthcheck"
+	"github.com/coder/coder/testutil"
+)
+
+func TestDebug(t *testing.T) {
+	t.Parallel()
+	t.Run("Health/OK", func(t *testing.T) {
+		t.Parallel()
+
+		var (
+			ctx, cancel = context.WithTimeout(context.Background(), testutil.WaitShort)
+			client      = coderdtest.New(t, &coderdtest.Options{
+				HealthcheckFunc: func(context.Context) (*healthcheck.Report, error) {
+					return &healthcheck.Report{}, nil
+				},
+			})
+			_ = coderdtest.CreateFirstUser(t, client)
+		)
+		defer cancel()
+
+		res, err := client.Request(ctx, "GET", "/debug/health", nil)
+		require.NoError(t, err)
+		defer res.Body.Close()
+		_, _ = io.ReadAll(res.Body)
+		require.Equal(t, http.StatusOK, res.StatusCode)
+	})
+
+	t.Run("Health/Timeout", func(t *testing.T) {
+		t.Parallel()
+
+		var (
+			ctx, cancel = context.WithTimeout(context.Background(), testutil.WaitShort)
+			client      = coderdtest.New(t, &coderdtest.Options{
+				HealthcheckTimeout: time.Microsecond,
+				HealthcheckFunc: func(context.Context) (*healthcheck.Report, error) {
+					t := time.NewTimer(time.Second)
+					defer t.Stop()
+
+					select {
+					case <-ctx.Done():
+						return nil, ctx.Err()
+					case <-t.C:
+						return &healthcheck.Report{}, nil
+					}
+				},
+			})
+			_ = coderdtest.CreateFirstUser(t, client)
+		)
+		defer cancel()
+
+		res, err := client.Request(ctx, "GET", "/api/v2/debug/health", nil)
+		require.NoError(t, err)
+		defer res.Body.Close()
+		_, _ = io.ReadAll(res.Body)
+		require.Equal(t, http.StatusNotFound, res.StatusCode)
+	})
+}