feat: add comprehensive test suite for recent backend changes

backend/handlers/services/services_test.go

@@ -347,3 +347,47 @@ func TestContact_ReturnsInfo(t *testing.T) {
 		t.Error("expected role in response")
 	}
 }
+
+// TestServices_Create_PatchTest verifies that creating a service with
+// patch_test_duration_hours > 0 automatically creates a patch test record.
+func TestServices_Create_PatchTest(t *testing.T) {
+	resetTestData(t)
+
+	adminToken := jwt.GenerateAdminToken()
+	handler := http.HandlerFunc(CreateServiceHandler)
+
+	req := CreateServiceRequest{
+		Name:                   "Lash Lift",
+		Description:            strPtr("Lash lift service"),
+		Price:                  50.00,
+		DurationMinutes:        60,
+		MinimumAgeRequired:     18,
+		PatchTestDurationHours: 48,
+	}
+
+	reqBody, _ := json.Marshal(req)
+	httpreq := httptest.NewRequest("POST", "/api/admin/services", bytes.NewReader(reqBody))
+	httpreq.Header.Set("Content-Type", "application/json")
+	httpreq.Header.Set("Authorization", "Bearer "+adminToken)
+
+	w := httptest.NewRecorder()
+	handler.ServeHTTP(w, httpreq)
+
+	if w.Code != http.StatusCreated {
+		t.Fatalf("expected status 201, got %d. body: %s", w.Code, w.Body.String())
+	}
+
+	var count int
+	err := db.DB.QueryRow(context.Background(),
+		"SELECT COUNT(*) FROM patch_tests WHERE notice_duration_hours = 48").Scan(&count)
+	if err != nil {
+		t.Fatalf("failed to query patch_tests: %v", err)
+	}
+	if count != 1 {
+		t.Errorf("expected 1 patch test record, got %d", count)
+	}
+}
+
+func strPtr(s string) *string {
+	return &s
+}