1 files changed, 92 insertions, 0 deletions
diff --git a/spec/frontend/__helpers__/vue_test_utils_helper_spec.js b/spec/frontend/__helpers__/vue_test_utils_helper_spec.js
new file mode 100644
index 00000000000..31c4ccd5dbb
--- /dev/null
+++ b/spec/frontend/__helpers__/vue_test_utils_helper_spec.js
@@ -0,0 +1,92 @@
+import { shallowMount } from '@vue/test-utils';
+import { extendedWrapper, shallowWrapperContainsSlotText } from './vue_test_utils_helper';
+
+describe('Vue test utils helpers', () => {
+  describe('shallowWrapperContainsSlotText', () => {
+    const mockText = 'text';
+    const mockSlot = `<div>${mockText}</div>`;
+    let mockComponent;
+
+    beforeEach(() => {
+      mockComponent = shallowMount(
+        {
+          render(h) {
+            h(`<div>mockedComponent</div>`);
+          },
+        },
+        {
+          slots: {
+            default: mockText,
+            namedSlot: mockSlot,
+          },
+        },
+      );
+    });
+
+    it('finds text within shallowWrapper default slot', () => {
+      expect(shallowWrapperContainsSlotText(mockComponent, 'default', mockText)).toBe(true);
+    });
+
+    it('finds text within shallowWrapper named slot', () => {
+      expect(shallowWrapperContainsSlotText(mockComponent, 'namedSlot', mockText)).toBe(true);
+    });
+
+    it('returns false when text is not present', () => {
+      const searchText = 'absent';
+
+      expect(shallowWrapperContainsSlotText(mockComponent, 'default', searchText)).toBe(false);
+      expect(shallowWrapperContainsSlotText(mockComponent, 'namedSlot', searchText)).toBe(false);
+    });
+
+    it('searches with case-sensitivity', () => {
+      const searchText = mockText.toUpperCase();
+
+      expect(shallowWrapperContainsSlotText(mockComponent, 'default', searchText)).toBe(false);
+      expect(shallowWrapperContainsSlotText(mockComponent, 'namedSlot', searchText)).toBe(false);
+    });
+  });
+
+  describe('extendedWrapper', () => {
+    describe('when an invalid wrapper is provided', () => {
+      beforeEach(() => {
+        // eslint-disable-next-line no-console
+        console.warn = jest.fn();
+      });
+
+      it.each`
+        wrapper
+        ${{}}
+        ${[]}
+        ${null}
+        ${undefined}
+        ${1}
+        ${''}
+      `('should warn with an error when the wrapper is $wrapper', ({ wrapper }) => {
+        extendedWrapper(wrapper);
+        /* eslint-disable no-console */
+        expect(console.warn).toHaveBeenCalled();
+        expect(console.warn).toHaveBeenCalledWith(
+          '[vue-test-utils-helper]: you are trying to extend an object that is not a VueWrapper.',
+        );
+        /* eslint-enable no-console */
+      });
+    });
+
+    describe('findByTestId', () => {
+      const testId = 'a-component';
+      let mockComponent;
+
+      beforeEach(() => {
+        mockComponent = extendedWrapper(
+          shallowMount({
+            template: `<div data-testid="${testId}"></div>`,
+          }),
+        );
+      });
+
+      it('should find the component by test id', () => {
+        expect(mockComponent.findByTestId(testId).exists()).toBe(true);
+      });
+    });
+  });
+});