1 files changed, 34 insertions, 0 deletions
diff --git a/spec/javascripts/issuable_context_spec.js b/spec/javascripts/issuable_context_spec.js
new file mode 100644
index 00000000000..bcb2b7b24a0
--- /dev/null
+++ b/spec/javascripts/issuable_context_spec.js
@@ -0,0 +1,34 @@
+/* global IssuableContext */
+import '~/issuable_context';
+import $ from 'jquery';
+
+describe('IssuableContext', () => {
+  describe('toggleHiddenParticipants', () => {
+    const event = jasmine.createSpyObj('event', ['preventDefault']);
+
+    beforeEach(() => {
+      spyOn($.fn, 'data').and.returnValue('data');
+      spyOn($.fn, 'text').and.returnValue('data');
+    });
+
+    afterEach(() => {
+      gl.lazyLoader = undefined;
+    });
+
+    it('calls loadCheck if lazyLoader is set', () => {
+      gl.lazyLoader = jasmine.createSpyObj('lazyLoader', ['loadCheck']);
+
+      IssuableContext.prototype.toggleHiddenParticipants(event);
+
+      expect(gl.lazyLoader.loadCheck).toHaveBeenCalled();
+    });
+
+    it('does not throw if lazyLoader is not defined', () => {
+      gl.lazyLoader = undefined;
+
+      const toggle = IssuableContext.prototype.toggleHiddenParticipants.bind(null, event);
+
+      expect(toggle).not.toThrow();
+    });
+  });
+});