1 files changed, 143 insertions, 1 deletions

diff --git a/spec/frontend/diffs/components/commit_item_spec.js b/spec/frontend/diffs/components/commit_item_spec.js
index 6bb3a0dcf21..0df951d43a7 100644
--- a/spec/frontend/diffs/components/commit_item_spec.js
+++ b/spec/frontend/diffs/components/commit_item_spec.js
@@ -13,6 +13,8 @@ const TEST_AUTHOR_EMAIL = 'test+test@gitlab.com';
 const TEST_AUTHOR_GRAVATAR = `${TEST_HOST}/avatar/test?s=40`;
 const TEST_SIGNATURE_HTML = '<a>Legit commit</a>';
 const TEST_PIPELINE_STATUS_PATH = `${TEST_HOST}/pipeline/status`;
+const NEXT_COMMIT_URL = `${TEST_HOST}/?commit_id=next`;
+const PREV_COMMIT_URL = `${TEST_HOST}/?commit_id=prev`;
 
 describe('diffs/components/commit_item', () => {
   let wrapper;
@@ -30,12 +32,24 @@ describe('diffs/components/commit_item', () => {
   const getCommitActionsElement = () => wrapper.find('.commit-actions');
   const getCommitPipelineStatus = () => wrapper.find(CommitPipelineStatus);
 
-  const mountComponent = propsData => {
+  const getCommitNavButtonsElement = () => wrapper.find('.commit-nav-buttons');
+  const getNextCommitNavElement = () =>
+    getCommitNavButtonsElement().find('.btn-group > *:last-child');
+  const getPrevCommitNavElement = () =>
+    getCommitNavButtonsElement().find('.btn-group > *:first-child');
+
+  const mountComponent = (propsData, featureFlags = {}) => {
     wrapper = mount(Component, {
       propsData: {
         commit,
         ...propsData,
       },
+      provide: {
+        glFeatures: {
+          mrCommitNeighborNav: true,
+          ...featureFlags,
+        },
+      },
       stubs: {
         CommitPipelineStatus: true,
       },
@@ -173,4 +187,132 @@ describe('diffs/components/commit_item', () => {
       expect(getCommitPipelineStatus().exists()).toBe(true);
     });
   });
+
+  describe('without neighbor commits', () => {
+    beforeEach(() => {
+      mountComponent({ commit: { ...commit, prev_commit_id: null, next_commit_id: null } });
+    });
+
+    it('does not render any navigation buttons', () => {
+      expect(getCommitNavButtonsElement().exists()).toEqual(false);
+    });
+  });
+
+  describe('with neighbor commits', () => {
+    let mrCommit;
+
+    beforeEach(() => {
+      mrCommit = {
+        ...commit,
+        next_commit_id: 'next',
+        prev_commit_id: 'prev',
+      };
+
+      mountComponent({ commit: mrCommit });
+    });
+
+    it('renders the commit navigation buttons', () => {
+      expect(getCommitNavButtonsElement().exists()).toEqual(true);
+
+      mountComponent({
+        commit: { ...mrCommit, next_commit_id: null },
+      });
+      expect(getCommitNavButtonsElement().exists()).toEqual(true);
+
+      mountComponent({
+        commit: { ...mrCommit, prev_commit_id: null },
+      });
+      expect(getCommitNavButtonsElement().exists()).toEqual(true);
+    });
+
+    it('does not render the commit navigation buttons if the `mrCommitNeighborNav` feature flag is disabled', () => {
+      mountComponent({ commit: mrCommit }, { mrCommitNeighborNav: false });
+
+      expect(getCommitNavButtonsElement().exists()).toEqual(false);
+    });
+
+    describe('prev commit', () => {
+      const { location } = window;
+
+      beforeAll(() => {
+        delete window.location;
+        window.location = { href: `${TEST_HOST}?commit_id=${mrCommit.id}` };
+      });
+
+      beforeEach(() => {
+        jest.spyOn(wrapper.vm, 'moveToNeighboringCommit').mockImplementation(() => {});
+      });
+
+      afterAll(() => {
+        window.location = location;
+      });
+
+      it('uses the correct href', () => {
+        const link = getPrevCommitNavElement();
+
+        expect(link.element.getAttribute('href')).toEqual(PREV_COMMIT_URL);
+      });
+
+      it('triggers the correct Vuex action on click', () => {
+        const link = getPrevCommitNavElement();
+
+        link.trigger('click');
+        return wrapper.vm.$nextTick().then(() => {
+          expect(wrapper.vm.moveToNeighboringCommit).toHaveBeenCalledWith({
+            direction: 'previous',
+          });
+        });
+      });
+
+      it('renders a disabled button when there is no prev commit', () => {
+        mountComponent({ commit: { ...mrCommit, prev_commit_id: null } });
+
+        const button = getPrevCommitNavElement();
+
+        expect(button.element.tagName).toEqual('BUTTON');
+        expect(button.element.hasAttribute('disabled')).toEqual(true);
+      });
+    });
+
+    describe('next commit', () => {
+      const { location } = window;
+
+      beforeAll(() => {
+        delete window.location;
+        window.location = { href: `${TEST_HOST}?commit_id=${mrCommit.id}` };
+      });
+
+      beforeEach(() => {
+        jest.spyOn(wrapper.vm, 'moveToNeighboringCommit').mockImplementation(() => {});
+      });
+
+      afterAll(() => {
+        window.location = location;
+      });
+
+      it('uses the correct href', () => {
+        const link = getNextCommitNavElement();
+
+        expect(link.element.getAttribute('href')).toEqual(NEXT_COMMIT_URL);
+      });
+
+      it('triggers the correct Vuex action on click', () => {
+        const link = getNextCommitNavElement();
+
+        link.trigger('click');
+        return wrapper.vm.$nextTick().then(() => {
+          expect(wrapper.vm.moveToNeighboringCommit).toHaveBeenCalledWith({ direction: 'next' });
+        });
+      });
+
+      it('renders a disabled button when there is no next commit', () => {
+        mountComponent({ commit: { ...mrCommit, next_commit_id: null } });
+
+        const button = getNextCommitNavElement();
+
+        expect(button.element.tagName).toEqual('BUTTON');
+        expect(button.element.hasAttribute('disabled')).toEqual(true);
+      });
+    });
+  });
 });