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diff --git a/spec/javascripts/diffs/components/parallel_diff_view_spec.js b/spec/javascripts/diffs/components/parallel_diff_view_spec.js
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+import Vue from 'vue';
+import ParallelDiffView from '~/diffs/components/parallel_diff_view.vue';
+import store from '~/mr_notes/stores';
+import * as constants from '~/diffs/constants';
+import { createComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
+import diffFileMockData from '../mock_data/diff_file';
+import discussionsMockData from '../mock_data/diff_discussions';
+
+describe('ParallelDiffView', () => {
+  let component;
+  const getDiffFileMock = () => Object.assign({}, diffFileMockData);
+  const getDiscussionsMockData = () => [Object.assign({}, discussionsMockData)];
+
+  beforeEach(() => {
+    const diffFile = getDiffFileMock();
+
+    component = createComponentWithStore(Vue.extend(ParallelDiffView), store, {
+      diffFile,
+      diffLines: diffFile.parallelDiffLines,
+    }).$mount();
+  });
+
+  describe('computed', () => {
+    describe('parallelDiffLines', () => {
+      it('should normalize lines for empty cells', () => {
+        expect(component.parallelDiffLines[0].left.type).toEqual(constants.EMPTY_CELL_TYPE);
+        expect(component.parallelDiffLines[1].left.type).toEqual(constants.EMPTY_CELL_TYPE);
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('hasDiscussion', () => {
+      it('it should return true if there is a discussion either for left or right section', () => {
+        Object.defineProperty(component, 'discussionsByLineCode', {
+          get() {
+            return { line_42: true };
+          },
+        });
+
+        expect(component.hasDiscussion({ left: {}, right: {} })).toEqual(undefined);
+        expect(component.hasDiscussion({ left: { lineCode: 'line_42' }, right: {} })).toEqual(true);
+        expect(component.hasDiscussion({ left: {}, right: { lineCode: 'line_42' } })).toEqual(true);
+      });
+    });
+
+    describe('getClassName', () => {
+      it('should return line class object', () => {
+        const { LINE_HOVER_CLASS_NAME, LINE_UNFOLD_CLASS_NAME } = constants;
+        const { MATCH_LINE_TYPE, NEW_LINE_TYPE, LINE_POSITION_RIGHT } = constants;
+
+        expect(component.getClassName(component.diffLines[1], LINE_POSITION_RIGHT)).toEqual({
+          [NEW_LINE_TYPE]: NEW_LINE_TYPE,
+          [LINE_UNFOLD_CLASS_NAME]: false,
+          [LINE_HOVER_CLASS_NAME]: false,
+        });
+
+        const eventMock = {
+          target: component.$refs.rightLines[1],
+        };
+
+        component.handleMouse(eventMock, component.diffLines[1], true);
+        Object.defineProperty(component, 'isLoggedIn', {
+          get() {
+            return true;
+          },
+        });
+
+        expect(component.getClassName(component.diffLines[1], LINE_POSITION_RIGHT)).toEqual({
+          [NEW_LINE_TYPE]: NEW_LINE_TYPE,
+          [LINE_UNFOLD_CLASS_NAME]: false,
+          [LINE_HOVER_CLASS_NAME]: true,
+        });
+
+        expect(component.getClassName(component.diffLines[5], LINE_POSITION_RIGHT)).toEqual({
+          [MATCH_LINE_TYPE]: MATCH_LINE_TYPE,
+          [LINE_UNFOLD_CLASS_NAME]: true,
+          [LINE_HOVER_CLASS_NAME]: false,
+        });
+      });
+    });
+
+    describe('handleMouse', () => {
+      it('should set hovered line code and line section to null when isHover is false', () => {
+        const rightLineEventMock = { target: component.$refs.rightLines[1] };
+        expect(component.hoveredLineCode).toEqual(null);
+        expect(component.hoveredSection).toEqual(null);
+
+        component.handleMouse(rightLineEventMock, null, false);
+        expect(component.hoveredLineCode).toEqual(null);
+        expect(component.hoveredSection).toEqual(null);
+      });
+
+      it('should set hovered line code and line section for right section', () => {
+        const rightLineEventMock = { target: component.$refs.rightLines[1] };
+        component.handleMouse(rightLineEventMock, component.diffLines[1], true);
+        expect(component.hoveredLineCode).toEqual(component.diffLines[1].right.lineCode);
+        expect(component.hoveredSection).toEqual(constants.LINE_POSITION_RIGHT);
+      });
+
+      it('should set hovered line code and line section for left section', () => {
+        const leftLineEventMock = { target: component.$refs.leftLines[2] };
+        component.handleMouse(leftLineEventMock, component.diffLines[2], true);
+        expect(component.hoveredLineCode).toEqual(component.diffLines[2].left.lineCode);
+        expect(component.hoveredSection).toEqual(constants.LINE_POSITION_LEFT);
+      });
+    });
+
+    describe('shouldRenderDiscussions', () => {
+      it('should return true if there is a discussion on left side and it is expanded', () => {
+        const line = { left: { lineCode: 'lineCode1' } };
+        spyOn(component, 'isDiscussionExpanded').and.returnValue(true);
+        Object.defineProperty(component, 'discussionsByLineCode', {
+          get() {
+            return {
+              [line.left.lineCode]: true,
+            };
+          },
+        });
+
+        expect(component.shouldRenderDiscussions(line, constants.LINE_POSITION_LEFT)).toEqual(true);
+        expect(component.isDiscussionExpanded).toHaveBeenCalledWith(line.left.lineCode);
+      });
+
+      it('should return false if there is a discussion on left side but it is collapsed', () => {
+        const line = { left: { lineCode: 'lineCode1' } };
+        spyOn(component, 'isDiscussionExpanded').and.returnValue(false);
+        Object.defineProperty(component, 'discussionsByLineCode', {
+          get() {
+            return {
+              [line.left.lineCode]: true,
+            };
+          },
+        });
+
+        expect(component.shouldRenderDiscussions(line, constants.LINE_POSITION_LEFT)).toEqual(
+          false,
+        );
+      });
+
+      it('should return false for discussions on the right side if there is no line type', () => {
+        const CUSTOM_RIGHT_LINE_TYPE = 'CUSTOM_RIGHT_LINE_TYPE';
+        const line = { right: { lineCode: 'lineCode1', type: CUSTOM_RIGHT_LINE_TYPE } };
+        spyOn(component, 'isDiscussionExpanded').and.returnValue(true);
+        Object.defineProperty(component, 'discussionsByLineCode', {
+          get() {
+            return {
+              [line.right.lineCode]: true,
+            };
+          },
+        });
+
+        expect(component.shouldRenderDiscussions(line, constants.LINE_POSITION_RIGHT)).toEqual(
+          CUSTOM_RIGHT_LINE_TYPE,
+        );
+      });
+    });
+
+    describe('hasAnyExpandedDiscussion', () => {
+      const LINE_CODE_LEFT = 'LINE_CODE_LEFT';
+      const LINE_CODE_RIGHT = 'LINE_CODE_RIGHT';
+
+      it('should return true if there is a discussion either on the left or the right side', () => {
+        const mockLineOne = {
+          right: { lineCode: LINE_CODE_RIGHT },
+          left: {},
+        };
+        const mockLineTwo = {
+          left: { lineCode: LINE_CODE_LEFT },
+          right: {},
+        };
+
+        spyOn(component, 'isDiscussionExpanded').and.callFake(lc => lc === LINE_CODE_RIGHT);
+        expect(component.hasAnyExpandedDiscussion(mockLineOne)).toEqual(true);
+        expect(component.hasAnyExpandedDiscussion(mockLineTwo)).toEqual(false);
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('should have rendered diff lines', () => {
+      const el = component.$el;
+
+      expect(el.querySelectorAll('tr.line_holder.parallel').length).toEqual(6);
+      expect(el.querySelectorAll('td.empty-cell').length).toEqual(4);
+      expect(el.querySelectorAll('td.line_content.parallel.right-side').length).toEqual(6);
+      expect(el.querySelectorAll('td.line_content.parallel.left-side').length).toEqual(6);
+      expect(el.querySelectorAll('td.match').length).toEqual(4);
+      expect(el.textContent.indexOf('Bad dates') > -1).toEqual(true);
+    });
+
+    it('should render discussions', done => {
+      const el = component.$el;
+      component.$store.dispatch('setInitialNotes', getDiscussionsMockData());
+
+      Vue.nextTick(() => {
+        expect(el.querySelectorAll('.notes_holder').length).toEqual(1);
+        expect(el.querySelectorAll('.notes_holder .note-discussion li').length).toEqual(5);
+        expect(el.innerText.indexOf('comment 5') > -1).toEqual(true);
+        component.$store.dispatch('setInitialNotes', []);
+
+        done();
+      });
+    });
+
+    it('should render new discussion forms', done => {
+      const el = component.$el;
+      const lines = getDiffFileMock().parallelDiffLines;
+
+      component.handleShowCommentForm({ lineCode: lines[0].lineCode });
+      component.handleShowCommentForm({ lineCode: lines[1].lineCode });
+
+      Vue.nextTick(() => {
+        expect(el.querySelectorAll('.js-vue-markdown-field').length).toEqual(2);
+        expect(el.querySelectorAll('tr')[1].classList.contains('notes_holder')).toEqual(true);
+        expect(el.querySelectorAll('tr')[3].classList.contains('notes_holder')).toEqual(true);
+
+        store.state.diffs.diffLineCommentForms = {};
+
+        done();
+      });
+    });
+  });
+});