Use subtests

server/main_test.go

@@ -87,12 +87,16 @@ func TestMain(t *testing.T) {
 
 	loc := time.Now().Location()
 
-	AssertCategoriesAndAvailableEqual(t, loc, handler, ctx, budget)
+	AssertCategoriesAndAvailableEqual(ctx, t, loc, handler, budget)
 
 	// check accounts
 }
 
-func AssertCategoriesAndAvailableEqual(t *testing.T, loc *time.Location, handler *Handler, ctx context.Context, budget *postgres.Budget) {
+func AssertCategoriesAndAvailableEqual(ctx context.Context, t *testing.T, loc *time.Location, handler *Handler, budget *postgres.Budget) {
+	t.Helper()
+
+	t.Run("Categories and available balance", func(t *testing.T) {
+		t.Parallel()
 		resultDir := "../testdata/production-export/results"
 		files, err := os.ReadDir(resultDir)
 		if err != nil {
@@ -110,10 +114,10 @@ func AssertCategoriesAndAvailableEqual(t *testing.T, loc *time.Location, handler
 			year, _ := strconv.Atoi(parts[0])
 			month, _ := strconv.Atoi(parts[1])
 			first := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, loc)
-		t.Logf("Checking balances for %s", first.Format("2006-01"))
 			testCaseFile := filepath.Join(resultDir, file.Name())
 			handler.CheckAvailableBalance(ctx, t, testCaseFile, budget, first)
 		}
+	})
 }
 
 type TestData struct {
@@ -130,6 +134,8 @@ type CategoryTestData struct {
 func (h Handler) CheckAvailableBalance(ctx context.Context, t *testing.T, testCaseFile string, budget *postgres.Budget, first time.Time) {
 	t.Helper()
 
+	t.Run(first.Format("2006-01"), func(t *testing.T) {
+		t.Parallel()
 		data, err := h.prepareBudgeting(ctx, *budget, first)
 		if err != nil {
 			t.Errorf("prepare budgeting: %s", err)
@@ -169,6 +175,7 @@ func (h Handler) CheckAvailableBalance(ctx context.Context, t *testing.T, testCa
 				t.Errorf("category " + categoryName + " was not found in result")
 			}
 		}
+	})
 }
 
 func assertEqual(t *testing.T, expected, actual float64, message string) {