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diff --git a/spec/frontend/diffs/components/diff_content_spec.js b/spec/frontend/diffs/components/diff_content_spec.js
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+++ b/spec/frontend/diffs/components/diff_content_spec.js
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+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import Vuex from 'vuex';
+import { GlLoadingIcon } from '@gitlab/ui';
+import DiffContentComponent from '~/diffs/components/diff_content.vue';
+import InlineDiffView from '~/diffs/components/inline_diff_view.vue';
+import NotDiffableViewer from '~/vue_shared/components/diff_viewer/viewers/not_diffable.vue';
+import NoPreviewViewer from '~/vue_shared/components/diff_viewer/viewers/no_preview.vue';
+import ParallelDiffView from '~/diffs/components/parallel_diff_view.vue';
+import ImageDiffOverlay from '~/diffs/components/image_diff_overlay.vue';
+import NoteForm from '~/notes/components/note_form.vue';
+import DiffDiscussions from '~/diffs/components/diff_discussions.vue';
+import { IMAGE_DIFF_POSITION_TYPE } from '~/diffs/constants';
+import diffFileMockData from '../../../javascripts/diffs/mock_data/diff_file';
+import { diffViewerModes } from '~/ide/constants';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('DiffContent', () => {
+  let wrapper;
+
+  const saveDiffDiscussionMock = jest.fn();
+  const closeDiffFileCommentFormMock = jest.fn();
+
+  const noteableTypeGetterMock = jest.fn();
+  const getUserDataGetterMock = jest.fn();
+
+  const isInlineViewGetterMock = jest.fn();
+  const isParallelViewGetterMock = jest.fn();
+  const getCommentFormForDiffFileGetterMock = jest.fn();
+
+  const defaultProps = {
+    diffFile: JSON.parse(JSON.stringify(diffFileMockData)),
+  };
+
+  const createComponent = ({ props, state } = {}) => {
+    const fakeStore = new Vuex.Store({
+      getters: {
+        getNoteableData() {
+          return {
+            current_user: {
+              can_create_note: true,
+            },
+          };
+        },
+        noteableType: noteableTypeGetterMock,
+        getUserData: getUserDataGetterMock,
+      },
+      modules: {
+        /*
+        we need extra batchComments since vue-test-utils does not
+        stub async components properly
+        */
+        batchComments: {
+          namespaced: true,
+          getters: {
+            draftsForFile: () => () => true,
+          },
+        },
+        diffs: {
+          namespaced: true,
+          state: {
+            projectPath: 'project/path',
+            endpoint: 'endpoint',
+            ...state,
+          },
+          getters: {
+            isInlineView: isInlineViewGetterMock,
+            isParallelView: isParallelViewGetterMock,
+            getCommentFormForDiffFile: getCommentFormForDiffFileGetterMock,
+          },
+          actions: {
+            saveDiffDiscussion: saveDiffDiscussionMock,
+            closeDiffFileCommentForm: closeDiffFileCommentFormMock,
+          },
+        },
+      },
+    });
+
+    wrapper = shallowMount(DiffContentComponent, {
+      propsData: {
+        ...defaultProps,
+        ...props,
+      },
+      localVue,
+      store: fakeStore,
+      sync: false,
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('with text based files', () => {
+    afterEach(() => {
+      [isParallelViewGetterMock, isInlineViewGetterMock].forEach(m => m.mockRestore());
+    });
+
+    const textDiffFile = { ...defaultProps.diffFile, viewer: { name: diffViewerModes.text } };
+    it('should render diff inline view if `isInlineView` is true', () => {
+      isInlineViewGetterMock.mockReturnValue(true);
+      createComponent({ props: { diffFile: textDiffFile } });
+
+      expect(wrapper.find(InlineDiffView).exists()).toBe(true);
+    });
+
+    it('should render parallel view if `isParallelView` getter is true', () => {
+      isParallelViewGetterMock.mockReturnValue(true);
+      createComponent({ props: { diffFile: textDiffFile } });
+
+      expect(wrapper.find(ParallelDiffView).exists()).toBe(true);
+    });
+
+    it('renders rendering more lines loading icon', () => {
+      createComponent({ props: { diffFile: { ...textDiffFile, renderingLines: true } } });
+
+      expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
+    });
+  });
+
+  describe('with empty files', () => {
+    const emptyDiffFile = {
+      ...defaultProps.diffFile,
+      viewer: { name: diffViewerModes.text },
+      highlighted_diff_lines: [],
+      parallel_diff_lines: [],
+    };
+
+    it('should render a no preview view if viewer set to no preview', () => {
+      createComponent({
+        props: { diffFile: { ...emptyDiffFile, viewer: { name: diffViewerModes.no_preview } } },
+      });
+
+      expect(wrapper.find(NoPreviewViewer).exists()).toBe(true);
+    });
+
+    it('should render not diffable view if viewer set to non_diffable', () => {
+      createComponent({
+        props: { diffFile: { ...emptyDiffFile, viewer: { name: diffViewerModes.not_diffable } } },
+      });
+
+      expect(wrapper.find(NotDiffableViewer).exists()).toBe(true);
+    });
+  });
+
+  describe('with image files', () => {
+    const imageDiffFile = { ...defaultProps.diffFile, viewer: { name: diffViewerModes.image } };
+
+    it('should have image diff view in place', () => {
+      getCommentFormForDiffFileGetterMock.mockReturnValue(() => true);
+      createComponent({ props: { diffFile: imageDiffFile } });
+
+      expect(wrapper.find(InlineDiffView).exists()).toBe(false);
+      expect(wrapper.find(ImageDiffOverlay).exists()).toBe(true);
+    });
+
+    it('renders diff file discussions', () => {
+      getCommentFormForDiffFileGetterMock.mockReturnValue(() => true);
+      createComponent({
+        props: {
+          diffFile: { ...imageDiffFile, discussions: [{ name: 'discussion-stub ' }] },
+        },
+      });
+
+      expect(wrapper.find(DiffDiscussions).exists()).toBe(true);
+    });
+
+    it('emits saveDiffDiscussion when note-form emits `handleFormUpdate`', () => {
+      const noteStub = {};
+      getCommentFormForDiffFileGetterMock.mockReturnValue(() => true);
+      const currentDiffFile = { ...imageDiffFile, discussions: [{ name: 'discussion-stub ' }] };
+      createComponent({
+        props: {
+          diffFile: currentDiffFile,
+        },
+      });
+
+      wrapper.find(NoteForm).vm.$emit('handleFormUpdate', noteStub);
+      expect(saveDiffDiscussionMock).toHaveBeenCalledWith(
+        expect.any(Object),
+        {
+          note: noteStub,
+          formData: {
+            noteableData: expect.any(Object),
+            diffFile: currentDiffFile,
+            positionType: IMAGE_DIFF_POSITION_TYPE,
+            x: undefined,
+            y: undefined,
+            width: undefined,
+            height: undefined,
+            noteableType: undefined,
+          },
+        },
+        undefined,
+      );
+    });
+  });
+});