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diff --git a/spec/frontend/vue_shared/components/diff_viewer/viewers/image_diff_viewer_spec.js b/spec/frontend/vue_shared/components/diff_viewer/viewers/image_diff_viewer_spec.js
new file mode 100644
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+++ b/spec/frontend/vue_shared/components/diff_viewer/viewers/image_diff_viewer_spec.js
@@ -0,0 +1,194 @@
+import Vue from 'vue';
+import { compileToFunctions } from 'vue-template-compiler';
+import { mount } from '@vue/test-utils';
+
+import { GREEN_BOX_IMAGE_URL, RED_BOX_IMAGE_URL } from 'spec/test_constants';
+import imageDiffViewer from '~/vue_shared/components/diff_viewer/viewers/image_diff_viewer.vue';
+
+describe('ImageDiffViewer', () => {
+  const requiredProps = {
+    diffMode: 'replaced',
+    newPath: GREEN_BOX_IMAGE_URL,
+    oldPath: RED_BOX_IMAGE_URL,
+  };
+  const allProps = {
+    ...requiredProps,
+    oldSize: 2048,
+    newSize: 1024,
+  };
+  let wrapper;
+  let vm;
+
+  function createComponent(props) {
+    const ImageDiffViewer = Vue.extend(imageDiffViewer);
+    wrapper = mount(ImageDiffViewer, { propsData: props });
+    vm = wrapper.vm;
+  }
+
+  const triggerEvent = (eventName, el = vm.$el, clientX = 0) => {
+    const event = new MouseEvent(eventName, {
+      bubbles: true,
+      cancelable: true,
+      view: window,
+      detail: 1,
+      screenX: clientX,
+      clientX,
+    });
+
+    // JSDOM does not implement experimental APIs
+    event.pageX = clientX;
+
+    el.dispatchEvent(event);
+  };
+
+  const dragSlider = (sliderElement, doc, dragPixel) => {
+    triggerEvent('mousedown', sliderElement);
+    triggerEvent('mousemove', doc.body, dragPixel);
+    triggerEvent('mouseup', doc.body);
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it('renders image diff for replaced', done => {
+    createComponent({ ...allProps });
+
+    vm.$nextTick(() => {
+      const metaInfoElements = vm.$el.querySelectorAll('.image-info');
+
+      expect(vm.$el.querySelector('.added img').getAttribute('src')).toBe(GREEN_BOX_IMAGE_URL);
+
+      expect(vm.$el.querySelector('.deleted img').getAttribute('src')).toBe(RED_BOX_IMAGE_URL);
+
+      expect(vm.$el.querySelector('.view-modes-menu li.active').textContent.trim()).toBe('2-up');
+      expect(vm.$el.querySelector('.view-modes-menu li:nth-child(2)').textContent.trim()).toBe(
+        'Swipe',
+      );
+
+      expect(vm.$el.querySelector('.view-modes-menu li:nth-child(3)').textContent.trim()).toBe(
+        'Onion skin',
+      );
+
+      expect(metaInfoElements.length).toBe(2);
+      expect(metaInfoElements[0]).toHaveText('2.00 KiB');
+      expect(metaInfoElements[1]).toHaveText('1.00 KiB');
+
+      done();
+    });
+  });
+
+  it('renders image diff for new', done => {
+    createComponent({ ...allProps, diffMode: 'new', oldPath: '' });
+
+    setImmediate(() => {
+      const metaInfoElement = vm.$el.querySelector('.image-info');
+
+      expect(vm.$el.querySelector('.added img').getAttribute('src')).toBe(GREEN_BOX_IMAGE_URL);
+      expect(metaInfoElement).toHaveText('1.00 KiB');
+
+      done();
+    });
+  });
+
+  it('renders image diff for deleted', done => {
+    createComponent({ ...allProps, diffMode: 'deleted', newPath: '' });
+
+    setImmediate(() => {
+      const metaInfoElement = vm.$el.querySelector('.image-info');
+
+      expect(vm.$el.querySelector('.deleted img').getAttribute('src')).toBe(RED_BOX_IMAGE_URL);
+      expect(metaInfoElement).toHaveText('2.00 KiB');
+
+      done();
+    });
+  });
+
+  it('renders image diff for renamed', done => {
+    vm = new Vue({
+      components: {
+        imageDiffViewer,
+      },
+      data: {
+        ...allProps,
+        diffMode: 'renamed',
+      },
+      ...compileToFunctions(`
+        <image-diff-viewer
+          :diff-mode="diffMode"
+          :new-path="newPath"
+          :old-path="oldPath"
+          :new-size="newSize"
+          :old-size="oldSize"
+        >
+          <span slot="image-overlay" class="overlay">test</span>
+        </image-diff-viewer>
+      `),
+    }).$mount();
+
+    setImmediate(() => {
+      const metaInfoElement = vm.$el.querySelector('.image-info');
+
+      expect(vm.$el.querySelector('img').getAttribute('src')).toBe(GREEN_BOX_IMAGE_URL);
+      expect(vm.$el.querySelector('.overlay')).not.toBe(null);
+
+      expect(metaInfoElement).toHaveText('2.00 KiB');
+
+      done();
+    });
+  });
+
+  describe('swipeMode', () => {
+    beforeEach(done => {
+      createComponent({ ...requiredProps });
+
+      setImmediate(() => {
+        done();
+      });
+    });
+
+    it('switches to Swipe Mode', done => {
+      vm.$el.querySelector('.view-modes-menu li:nth-child(2)').click();
+
+      vm.$nextTick(() => {
+        expect(vm.$el.querySelector('.view-modes-menu li.active').textContent.trim()).toBe('Swipe');
+        done();
+      });
+    });
+  });
+
+  describe('onionSkin', () => {
+    beforeEach(done => {
+      createComponent({ ...requiredProps });
+
+      setImmediate(() => {
+        done();
+      });
+    });
+
+    it('switches to Onion Skin Mode', done => {
+      vm.$el.querySelector('.view-modes-menu li:nth-child(3)').click();
+
+      vm.$nextTick(() => {
+        expect(vm.$el.querySelector('.view-modes-menu li.active').textContent.trim()).toBe(
+          'Onion skin',
+        );
+        done();
+      });
+    });
+
+    it('has working drag handler', done => {
+      vm.$el.querySelector('.view-modes-menu li:nth-child(3)').click();
+
+      vm.$nextTick(() => {
+        dragSlider(vm.$el.querySelector('.dragger'), document, 20);
+
+        vm.$nextTick(() => {
+          expect(vm.$el.querySelector('.dragger').style.left).toBe('20px');
+          expect(vm.$el.querySelector('.added.frame').style.opacity).toBe('0.2');
+          done();
+        });
+      });
+    });
+  });
+});