1 files changed, 59 insertions, 0 deletions
diff --git a/spec/javascripts/vue_shared/components/panel_resizer_spec.js b/spec/javascripts/vue_shared/components/panel_resizer_spec.js
new file mode 100644
index 00000000000..70ce3dffaba
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+++ b/spec/javascripts/vue_shared/components/panel_resizer_spec.js
@@ -0,0 +1,59 @@
+import Vue from 'vue';
+import panelResizer from '~/vue_shared/components/panel_resizer.vue';
+import mountComponent from '../../helpers/vue_mount_component_helper';
+
+describe('Panel Resizer component', () => {
+  let vm;
+  let PanelResizer;
+
+  const triggerEvent = (eventName, el = vm.$el, clientX = 0) => {
+    const event = document.createEvent('MouseEvents');
+    event.initMouseEvent(eventName, true, true, window, 1, clientX, 0, clientX, 0, false, false,
+                         false, false, 0, null);
+
+    el.dispatchEvent(event);
+  };
+
+  beforeEach(() => {
+    PanelResizer = Vue.extend(panelResizer);
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  it('should render a div element with the correct classes and styles', () => {
+    vm = mountComponent(PanelResizer, {
+      startSize: 100,
+      side: 'left',
+    });
+
+    expect(vm.$el.tagName).toEqual('DIV');
+    expect(vm.$el.getAttribute('class')).toBe('dragHandle dragleft');
+    expect(vm.$el.getAttribute('style')).toBe('cursor: ew-resize;');
+  });
+
+  it('should render a div element with the correct classes for a right side panel', () => {
+    vm = mountComponent(PanelResizer, {
+      startSize: 100,
+      side: 'right',
+    });
+
+    expect(vm.$el.tagName).toEqual('DIV');
+    expect(vm.$el.getAttribute('class')).toBe('dragHandle dragright');
+  });
+
+  it('drag the resizer', () => {
+    vm = mountComponent(PanelResizer, {
+      startSize: 100,
+      side: 'left',
+    });
+
+    spyOn(vm, '$emit');
+    triggerEvent('mousedown', vm.$el);
+    triggerEvent('mousemove', document);
+    triggerEvent('mouseup', document);
+    expect(vm.$emit.calls.allArgs()).toEqual([['resize-start', 100], ['update:size', 100], ['resize-end', 100]]);
+    expect(vm.size).toBe(100);
+  });
+});