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diff --git a/spec/frontend/image_diff/helpers/utils_helper_spec.js b/spec/frontend/image_diff/helpers/utils_helper_spec.js
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+++ b/spec/frontend/image_diff/helpers/utils_helper_spec.js
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+import * as utilsHelper from '~/image_diff/helpers/utils_helper';
+import ImageBadge from '~/image_diff/image_badge';
+import * as mockData from '../mock_data';
+
+describe('utilsHelper', () => {
+  const { noteId, discussionId, image, imageProperties, imageMeta } = mockData;
+
+  describe('resizeCoordinatesToImageElement', () => {
+    let result;
+
+    beforeEach(() => {
+      result = utilsHelper.resizeCoordinatesToImageElement(image, imageMeta);
+    });
+
+    it('should return x based on widthRatio', () => {
+      expect(result.x).toEqual(imageMeta.x * 0.5);
+    });
+
+    it('should return y based on heightRatio', () => {
+      expect(result.y).toEqual(imageMeta.y * 0.5);
+    });
+
+    it('should return image width', () => {
+      expect(result.width).toEqual(image.width);
+    });
+
+    it('should return image height', () => {
+      expect(result.height).toEqual(image.height);
+    });
+  });
+
+  describe('generateBadgeFromDiscussionDOM', () => {
+    let discussionEl;
+    let result;
+
+    beforeEach(() => {
+      const imageFrameEl = document.createElement('div');
+      imageFrameEl.innerHTML = `
+        <img src="${gl.TEST_HOST}/image.png">
+      `;
+      discussionEl = document.createElement('div');
+      discussionEl.dataset.discussionId = discussionId;
+      discussionEl.innerHTML = `
+        <div class="note" id="${noteId}"></div>
+      `;
+      discussionEl.dataset.position = JSON.stringify(imageMeta);
+      result = utilsHelper.generateBadgeFromDiscussionDOM(imageFrameEl, discussionEl);
+    });
+
+    it('should return actual image properties', () => {
+      const { actual } = result;
+
+      expect(actual.x).toEqual(imageMeta.x);
+      expect(actual.y).toEqual(imageMeta.y);
+      expect(actual.width).toEqual(imageMeta.width);
+      expect(actual.height).toEqual(imageMeta.height);
+    });
+
+    it('should return browser image properties', () => {
+      const { browser } = result;
+
+      expect(browser.x).toBeDefined();
+      expect(browser.y).toBeDefined();
+      expect(browser.width).toBeDefined();
+      expect(browser.height).toBeDefined();
+    });
+
+    it('should return instance of ImageBadge', () => {
+      expect(result instanceof ImageBadge).toEqual(true);
+    });
+
+    it('should return noteId', () => {
+      expect(result.noteId).toEqual(noteId);
+    });
+
+    it('should return discussionId', () => {
+      expect(result.discussionId).toEqual(discussionId);
+    });
+  });
+
+  describe('getTargetSelection', () => {
+    let containerEl;
+
+    beforeEach(() => {
+      containerEl = {
+        querySelector: () => imageProperties,
+      };
+    });
+
+    function generateEvent(offsetX, offsetY) {
+      return {
+        currentTarget: containerEl,
+        offsetX,
+        offsetY,
+      };
+    }
+
+    it('should return browser properties', () => {
+      const event = generateEvent(25, 25);
+      const result = utilsHelper.getTargetSelection(event);
+
+      const { browser } = result;
+
+      expect(browser.x).toEqual(event.offsetX);
+      expect(browser.y).toEqual(event.offsetY);
+      expect(browser.width).toEqual(imageProperties.width);
+      expect(browser.height).toEqual(imageProperties.height);
+    });
+
+    it('should return resized actual image properties', () => {
+      const event = generateEvent(50, 50);
+      const result = utilsHelper.getTargetSelection(event);
+
+      const { actual } = result;
+
+      expect(actual.x).toEqual(100);
+      expect(actual.y).toEqual(100);
+      expect(actual.width).toEqual(imageProperties.naturalWidth);
+      expect(actual.height).toEqual(imageProperties.naturalHeight);
+    });
+
+    describe('normalize coordinates', () => {
+      it('should return x = 0 if x < 0', () => {
+        const event = generateEvent(-5, 50);
+        const result = utilsHelper.getTargetSelection(event);
+
+        expect(result.browser.x).toEqual(0);
+      });
+
+      it('should return x = width if x > width', () => {
+        const event = generateEvent(1000, 50);
+        const result = utilsHelper.getTargetSelection(event);
+
+        expect(result.browser.x).toEqual(imageProperties.width);
+      });
+
+      it('should return y = 0 if y < 0', () => {
+        const event = generateEvent(50, -10);
+        const result = utilsHelper.getTargetSelection(event);
+
+        expect(result.browser.y).toEqual(0);
+      });
+
+      it('should return y = height if y > height', () => {
+        const event = generateEvent(50, 1000);
+        const result = utilsHelper.getTargetSelection(event);
+
+        expect(result.browser.y).toEqual(imageProperties.height);
+      });
+    });
+  });
+});