Add tests for the ProjectLoaderHOC

test/unit/util/project-loader-hoc.test.jsx

+import React from 'react';
+import ProjectLoaderHOC, {ProjectLoader} from '../../../src/lib/project-loader-hoc.jsx';
+import {mount} from 'enzyme';
+
+describe('ProjectLoaderHOC', () => {
+    test('when there is no project data, it renders null', () => {
+        const Component = ({projectData}) => <div>{projectData}</div>;
+        const WrappedComponent = ProjectLoaderHOC(Component);
+        window.location.hash = '#winning';
+        ProjectLoader.load = jest.fn((id, cb) => cb(null, null));
+        const mounted = mount(<WrappedComponent />);
+        ProjectLoader.load.mockRestore();
+        window.location.hash = '';
+        expect(mounted.find('div').exists()).toEqual(false);
+    });
+
+    test('when there is no hash, it loads the default project', () => {
+        const Component = ({projectData}) => <div>{projectData}</div>;
+        const WrappedComponent = ProjectLoaderHOC(Component);
+        window.location.hash = '';
+        const mounted = mount(<WrappedComponent />);
+        expect(mounted.find('div').text()).toEqual(JSON.stringify(ProjectLoader.DEFAULT_PROJECT_DATA));
+    });
+
+    test('when there is a hash, it tries to load that project', () => {
+        const Component = ({projectData}) => <div>{projectData}</div>;
+        const WrappedComponent = ProjectLoaderHOC(Component);
+        window.location.hash = '#winning';
+        ProjectLoader.load = jest.fn((id, cb) => cb(null, id));
+        const mounted = mount(<WrappedComponent />);
+        mounted.update();
+        ProjectLoader.load.mockRestore();
+        window.location.hash = '';
+        expect(mounted
+            .find('div')
+            .text()
+        ).toEqual('winning');
+    });
+
+    test('when hash change happens, the project data state is changed', () => {
+        const Component = ({projectData}) => <div>{projectData}</div>;
+        const WrappedComponent = ProjectLoaderHOC(Component);
+        window.location.hash = '';
+        const mounted = mount(<WrappedComponent />);
+        const before = mounted.find('div').text();
+        ProjectLoader.load = jest.fn((id, cb) => cb(null, id));
+        window.location.hash = `#winning`;
+        mounted.node.updateProject();
+        expect(mounted.find('div').text()).not.toEqual(before);
+    });
+});