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diff --git a/spec/frontend/vue_shared/components/markdown/header_spec.js b/spec/frontend/vue_shared/components/markdown/header_spec.js
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+++ b/spec/frontend/vue_shared/components/markdown/header_spec.js
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+import Vue from 'vue';
+import $ from 'jquery';
+import headerComponent from '~/vue_shared/components/markdown/header.vue';
+
+describe('Markdown field header component', () => {
+  let vm;
+
+  beforeEach(done => {
+    const Component = Vue.extend(headerComponent);
+
+    vm = new Component({
+      propsData: {
+        previewMarkdown: false,
+      },
+    }).$mount();
+
+    Vue.nextTick(done);
+  });
+
+  it('renders markdown header buttons', () => {
+    const buttons = [
+      'Add bold text',
+      'Add italic text',
+      'Insert a quote',
+      'Insert suggestion',
+      'Insert code',
+      'Add a link',
+      'Add a bullet list',
+      'Add a numbered list',
+      'Add a task list',
+      'Add a table',
+      'Go full screen',
+    ];
+    const elements = vm.$el.querySelectorAll('.toolbar-btn');
+
+    elements.forEach((buttonEl, index) => {
+      expect(buttonEl.getAttribute('data-original-title')).toBe(buttons[index]);
+    });
+  });
+
+  it('renders `write` link as active when previewMarkdown is false', () => {
+    expect(vm.$el.querySelector('li:nth-child(1)').classList.contains('active')).toBeTruthy();
+  });
+
+  it('renders `preview` link as active when previewMarkdown is true', done => {
+    vm.previewMarkdown = true;
+
+    Vue.nextTick(() => {
+      expect(vm.$el.querySelector('li:nth-child(2)').classList.contains('active')).toBeTruthy();
+
+      done();
+    });
+  });
+
+  it('emits toggle markdown event when clicking preview', () => {
+    jest.spyOn(vm, '$emit').mockImplementation();
+
+    vm.$el.querySelector('.js-preview-link').click();
+
+    expect(vm.$emit).toHaveBeenCalledWith('preview-markdown');
+
+    vm.$el.querySelector('.js-write-link').click();
+
+    expect(vm.$emit).toHaveBeenCalledWith('write-markdown');
+  });
+
+  it('does not emit toggle markdown event when triggered from another form', () => {
+    jest.spyOn(vm, '$emit').mockImplementation();
+
+    $(document).triggerHandler('markdown-preview:show', [
+      $(
+        '<form><div class="js-vue-markdown-field"><textarea class="markdown-area"></textarea></div></form>',
+      ),
+    ]);
+
+    expect(vm.$emit).not.toHaveBeenCalled();
+  });
+
+  it('blurs preview link after click', () => {
+    const link = vm.$el.querySelector('li:nth-child(2) button');
+    jest.spyOn(HTMLElement.prototype, 'blur').mockImplementation();
+
+    link.click();
+
+    expect(link.blur).toHaveBeenCalled();
+  });
+
+  it('renders markdown table template', () => {
+    expect(vm.mdTable).toEqual(
+      '| header | header |\n| ------ | ------ |\n| cell | cell |\n| cell | cell |',
+    );
+  });
+
+  it('renders suggestion template', () => {
+    vm.lineContent = 'Some content';
+
+    expect(vm.mdSuggestion).toEqual('```suggestion:-0+0\n{text}\n```');
+  });
+
+  it('does not render suggestion button if `canSuggest` is set to false', () => {
+    vm.canSuggest = false;
+
+    Vue.nextTick(() => {
+      expect(vm.$el.querySelector('.qa-suggestion-btn')).toBe(null);
+    });
+  });
+});