refac: deleting an article also deletes its images, and deleting a missing article returns 404

test/image_test.go

@@ -19,9 +19,11 @@ var supportedImageContentTypes = map[string]bool{
 }
 
 type mockImageRepo struct {
-	images map[uint32]imageDomain.Image
-	nextID uint32
-	fail   failSwitch
+	images        map[uint32]imageDomain.Image
+	nextID        uint32
+	fail          failSwitch
+	failDeleteFor map[uint32]error
+	deleteCalls   []uint32
 }
 
 func newMockImageRepo() *mockImageRepo {
@@ -45,9 +47,13 @@ func (m *mockImageRepo) Create(input imageDomain.ImageInput) (imageDomain.Image,
 }
 
 func (m *mockImageRepo) Delete(id uint32) error {
+	m.deleteCalls = append(m.deleteCalls, id)
 	if err := m.fail.trigger("Delete"); err != nil {
 		return err
 	}
+	if err, ok := m.failDeleteFor[id]; ok {
+		return err
+	}
 	if _, ok := m.images[id]; !ok {
 		return imageDomain.ErrImageNotFound
 	}