Add specs for coercing triggeredBy into a collection.

spec/javascripts/pipelines/graph/graph_component_spec.js

@@ -83,6 +83,10 @@ describe('graph component', function () {
     });
 
     describe('linked pipelines components', function () {
+      it('should coerce triggeredBy into a collection', function () {
+        expect(this.component.triggeredBy.length).toBe(1);
+      });
+
       it('should render an upstream pipelines column', function () {
         expect(this.component.$el.querySelector('.linked-pipelines-column')).not.toBeNull();
         expect(this.component.$el.innerHTML).toContain('Upstream');

spec/javascripts/vue_mr_widget/components/mr_widget_pipeline_spec.js

@@ -130,6 +130,14 @@ describe('MRWidgetPipeline', () => {
       });
     });
 
+    it('should set triggered to an empty array', () => {
+      expect(vm.triggered.length).toBe(0);
+    });
+
+    it('should set triggeredBy to an empty array', () => {
+      expect(vm.triggered.length).toBe(0);
+    });
+
     it('should not render upstream or downstream pipelines', () => {
       expect(el.querySelector('.linked-pipeline-mini-list')).toBeNull();
     });
@@ -149,6 +157,10 @@ describe('MRWidgetPipeline', () => {
       }).$mount();
     });
 
+    it('should coerce triggeredBy into a collection', function() {
+      expect(this.vm.triggeredBy.length).toBe(1);
+    });
+
     it('should render the linked pipelines mini list', function (done) {
       Vue.nextTick(() => {
         expect(this.vm.$el.querySelector('.linked-pipeline-mini-list.is-upstream')).not.toBeNull();