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diff --git a/spec/frontend/wikis_spec.js b/spec/frontend/wikis_spec.js
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+++ b/spec/frontend/wikis_spec.js
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+import Wikis from '~/pages/projects/wikis/wikis';
+import { setHTMLFixture } from './helpers/fixtures';
+
+describe('Wikis', () => {
+  describe('setting the commit message when the title changes', () => {
+    const editFormHtmlFixture = args => `<form class="wiki-form ${
+      args.newPage ? 'js-new-wiki-page' : ''
+    }">
+        <input type="text" id="wiki_title" value="My title" />
+        <input type="text" id="wiki_message" />
+      </form>`;
+
+    let wikis;
+    let titleInput;
+    let messageInput;
+
+    describe('when the wiki page is being created', () => {
+      const formHtmlFixture = editFormHtmlFixture({ newPage: true });
+
+      beforeEach(() => {
+        setHTMLFixture(formHtmlFixture);
+
+        titleInput = document.getElementById('wiki_title');
+        messageInput = document.getElementById('wiki_message');
+        wikis = new Wikis();
+      });
+
+      it('binds an event listener to the title input', () => {
+        wikis.handleWikiTitleChange = jest.fn();
+
+        titleInput.dispatchEvent(new Event('keyup'));
+
+        expect(wikis.handleWikiTitleChange).toHaveBeenCalled();
+      });
+
+      it('sets the commit message when title changes', () => {
+        titleInput.value = 'My title';
+        messageInput.value = '';
+
+        titleInput.dispatchEvent(new Event('keyup'));
+
+        expect(messageInput.value).toEqual('Create My title');
+      });
+
+      it('replaces hyphens with spaces', () => {
+        titleInput.value = 'my-hyphenated-title';
+        titleInput.dispatchEvent(new Event('keyup'));
+
+        expect(messageInput.value).toEqual('Create my hyphenated title');
+      });
+    });
+
+    describe('when the wiki page is being updated', () => {
+      const formHtmlFixture = editFormHtmlFixture({ newPage: false });
+
+      beforeEach(() => {
+        setHTMLFixture(formHtmlFixture);
+
+        titleInput = document.getElementById('wiki_title');
+        messageInput = document.getElementById('wiki_message');
+        wikis = new Wikis();
+      });
+
+      it('sets the commit message when title changes, prefixing with "Update"', () => {
+        titleInput.value = 'My title';
+        messageInput.value = '';
+
+        titleInput.dispatchEvent(new Event('keyup'));
+
+        expect(messageInput.value).toEqual('Update My title');
+      });
+    });
+  });
+});