1 files changed, 96 insertions, 0 deletions
diff --git a/spec/frontend/ci/catalog/components/details/ci_resource_readme_spec.js b/spec/frontend/ci/catalog/components/details/ci_resource_readme_spec.js
new file mode 100644
index 00000000000..0dadac236a8
--- /dev/null
+++ b/spec/frontend/ci/catalog/components/details/ci_resource_readme_spec.js
@@ -0,0 +1,96 @@
+import Vue from 'vue';
+import VueApollo from 'vue-apollo';
+import { GlLoadingIcon } from '@gitlab/ui';
+import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
+import CiResourceReadme from '~/ci/catalog/components/details/ci_resource_readme.vue';
+import getCiCatalogResourceReadme from '~/ci/catalog/graphql/queries/get_ci_catalog_resource_readme.query.graphql';
+import createMockApollo from 'helpers/mock_apollo_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import { createAlert } from '~/alert';
+
+jest.mock('~/alert');
+
+Vue.use(VueApollo);
+
+const readmeHtml = '<h1>This is a readme file</h1>';
+const resourceId = 'gid://gitlab/Ci::Catalog::Resource/1';
+
+describe('CiResourceReadme', () => {
+  let wrapper;
+  let mockReadmeResponse;
+
+  const readmeMockData = {
+    data: {
+      ciCatalogResource: {
+        id: resourceId,
+        readmeHtml,
+      },
+    },
+  };
+
+  const defaultProps = { resourceId };
+
+  const createComponent = ({ props = {} } = {}) => {
+    const handlers = [[getCiCatalogResourceReadme, mockReadmeResponse]];
+
+    wrapper = shallowMountExtended(CiResourceReadme, {
+      propsData: {
+        ...defaultProps,
+        ...props,
+      },
+      apolloProvider: createMockApollo(handlers),
+    });
+  };
+
+  const findLoadingIcon = () => wrapper.findComponent(GlLoadingIcon);
+
+  beforeEach(() => {
+    mockReadmeResponse = jest.fn();
+  });
+
+  describe('when loading', () => {
+    beforeEach(() => {
+      mockReadmeResponse.mockResolvedValue(readmeMockData);
+      createComponent();
+    });
+
+    it('renders only a loading icon', () => {
+      expect(findLoadingIcon().exists()).toBe(true);
+      expect(wrapper.html()).not.toContain(readmeHtml);
+    });
+  });
+
+  describe('when mounted', () => {
+    beforeEach(async () => {
+      mockReadmeResponse.mockResolvedValue(readmeMockData);
+
+      createComponent();
+      await waitForPromises();
+    });
+
+    it('renders only the received HTML', () => {
+      expect(findLoadingIcon().exists()).toBe(false);
+      expect(wrapper.html()).toContain(readmeHtml);
+    });
+
+    it('does not render an error', () => {
+      expect(createAlert).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('when there is an error loading the readme', () => {
+    beforeEach(async () => {
+      mockReadmeResponse.mockRejectedValue({ errors: [] });
+
+      createComponent();
+      await waitForPromises();
+    });
+
+    it('calls the createAlert function to show an error', () => {
+      expect(createAlert).toHaveBeenCalled();
+      expect(createAlert).toHaveBeenCalledWith({
+        message: "There was a problem loading this project's readme content.",
+      });
+    });
+  });
+});