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diff --git a/spec/javascripts/behaviors/shortcuts/shortcuts_issuable_spec.js b/spec/javascripts/behaviors/shortcuts/shortcuts_issuable_spec.js
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+++ b/spec/javascripts/behaviors/shortcuts/shortcuts_issuable_spec.js
@@ -0,0 +1,106 @@
+import $ from 'jquery';
+import initCopyAsGFM from '~/behaviors/markdown/copy_as_gfm';
+import ShortcutsIssuable from '~/behaviors/shortcuts/shortcuts_issuable';
+
+initCopyAsGFM();
+
+const FORM_SELECTOR = '.js-main-target-form .js-vue-comment-form';
+
+describe('ShortcutsIssuable', function() {
+  const fixtureName = 'snippets/show.html.raw';
+  preloadFixtures(fixtureName);
+
+  beforeEach(() => {
+    loadFixtures(fixtureName);
+    $('body').append(
+      `<div class="js-main-target-form">
+        <textare class="js-vue-comment-form"></textare>
+      </div>`,
+    );
+    document.querySelector('.js-new-note-form').classList.add('js-main-target-form');
+    this.shortcut = new ShortcutsIssuable(true);
+  });
+
+  afterEach(() => {
+    $(FORM_SELECTOR).remove();
+  });
+
+  describe('replyWithSelectedText', () => {
+    // Stub window.gl.utils.getSelectedFragment to return a node with the provided HTML.
+    const stubSelection = html => {
+      window.gl.utils.getSelectedFragment = () => {
+        const node = document.createElement('div');
+        node.innerHTML = html;
+
+        return node;
+      };
+    };
+    describe('with empty selection', () => {
+      it('does not return an error', () => {
+        ShortcutsIssuable.replyWithSelectedText(true);
+
+        expect($(FORM_SELECTOR).val()).toBe('');
+      });
+
+      it('triggers `focus`', () => {
+        const spy = spyOn(document.querySelector(FORM_SELECTOR), 'focus');
+        ShortcutsIssuable.replyWithSelectedText(true);
+
+        expect(spy).toHaveBeenCalled();
+      });
+    });
+
+    describe('with any selection', () => {
+      beforeEach(() => {
+        stubSelection('<p>Selected text.</p>');
+      });
+
+      it('leaves existing input intact', () => {
+        $(FORM_SELECTOR).val('This text was already here.');
+        expect($(FORM_SELECTOR).val()).toBe('This text was already here.');
+
+        ShortcutsIssuable.replyWithSelectedText(true);
+        expect($(FORM_SELECTOR).val()).toBe('This text was already here.\n\n> Selected text.\n\n');
+      });
+
+      it('triggers `input`', () => {
+        let triggered = false;
+        $(FORM_SELECTOR).on('input', () => {
+          triggered = true;
+        });
+
+        ShortcutsIssuable.replyWithSelectedText(true);
+        expect(triggered).toBe(true);
+      });
+
+      it('triggers `focus`', () => {
+        const spy = spyOn(document.querySelector(FORM_SELECTOR), 'focus');
+        ShortcutsIssuable.replyWithSelectedText(true);
+
+        expect(spy).toHaveBeenCalled();
+      });
+    });
+
+    describe('with a one-line selection', () => {
+      it('quotes the selection', () => {
+        stubSelection('<p>This text has been selected.</p>');
+        ShortcutsIssuable.replyWithSelectedText(true);
+
+        expect($(FORM_SELECTOR).val()).toBe('> This text has been selected.\n\n');
+      });
+    });
+
+    describe('with a multi-line selection', () => {
+      it('quotes the selected lines as a group', () => {
+        stubSelection(
+          '<p>Selected line one.</p>\n<p>Selected line two.</p>\n<p>Selected line three.</p>',
+        );
+        ShortcutsIssuable.replyWithSelectedText(true);
+
+        expect($(FORM_SELECTOR).val()).toBe(
+          '> Selected line one.\n>\n> Selected line two.\n>\n> Selected line three.\n\n',
+        );
+      });
+    });
+  });
+});