1 files changed, 70 insertions, 1 deletions

diff --git a/spec/javascripts/diffs/components/diff_file_header_spec.js b/spec/javascripts/diffs/components/diff_file_header_spec.js
index 66c5b17b825..2d10b8383e2 100644
--- a/spec/javascripts/diffs/components/diff_file_header_spec.js
+++ b/spec/javascripts/diffs/components/diff_file_header_spec.js
@@ -3,7 +3,7 @@ import Vuex from 'vuex';
 import diffsModule from '~/diffs/store/modules';
 import notesModule from '~/notes/stores/modules';
 import DiffFileHeader from '~/diffs/components/diff_file_header.vue';
-import { mountComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
+import mountComponent, { mountComponentWithStore } from 'spec/helpers/vue_mount_component_helper';
 import diffDiscussionsMockData from '../mock_data/diff_discussions';
 import { diffViewerModes } from '~/ide/constants';
 
@@ -252,6 +252,75 @@ describe('diff_file_header', () => {
         expect(vm.$emit).not.toHaveBeenCalled();
       });
     });
+
+    describe('handleFileNameClick', () => {
+      let e;
+
+      beforeEach(() => {
+        e = { preventDefault: () => {} };
+        spyOn(e, 'preventDefault');
+      });
+
+      describe('when file name links to other page', () => {
+        it('does not call preventDefault if submodule tree url exists', () => {
+          vm = mountComponent(Component, {
+            ...props,
+            diffFile: { ...props.diffFile, submodule_tree_url: 'foobar.com' },
+          });
+
+          vm.handleFileNameClick(e);
+
+          expect(e.preventDefault).not.toHaveBeenCalled();
+        });
+
+        it('does not call preventDefault if submodule_link exists', () => {
+          vm = mountComponent(Component, {
+            ...props,
+            diffFile: { ...props.diffFile, submodule_link: 'foobar.com' },
+          });
+          vm.handleFileNameClick(e);
+
+          expect(e.preventDefault).not.toHaveBeenCalled();
+        });
+
+        it('does not call preventDefault if discussionPath exists', () => {
+          vm = mountComponent(Component, {
+            ...props,
+            discussionPath: 'Foo bar',
+          });
+
+          vm.handleFileNameClick(e);
+
+          expect(e.preventDefault).not.toHaveBeenCalled();
+        });
+      });
+
+      describe('scrolling to diff', () => {
+        let scrollToElement;
+        let el;
+
+        beforeEach(() => {
+          el = document.createElement('div');
+          spyOn(document, 'querySelector').and.returnValue(el);
+          scrollToElement = spyOnDependency(DiffFileHeader, 'scrollToElement');
+          vm = mountComponent(Component, props);
+
+          vm.handleFileNameClick(e);
+        });
+
+        it('calls scrollToElement with file content', () => {
+          expect(scrollToElement).toHaveBeenCalledWith(el);
+        });
+
+        it('element adds the content id to the window location', () => {
+          expect(window.location.hash).toContain(props.diffFile.file_hash);
+        });
+
+        it('calls preventDefault when button does not link to other page', () => {
+          expect(e.preventDefault).toHaveBeenCalled();
+        });
+      });
+    });
   });
 
   describe('template', () => {