add getServer spec

Author: aitchiss

src/lib/get-server/get-server.test.js

@@ -0,0 +1,64 @@
+jest.unstable_mockModule('chalk', () => {
+  return {
+    default: {
+      magenta: (m) => m,
+    },
+  };
+});
+
+const mockedExpress = () => ({
+  use: jest.fn(),
+  listen: jest.fn(),
+});
+const mockStatic = jest.fn();
+Object.defineProperty(mockedExpress, 'static', { value: mockStatic });
+
+jest.unstable_mockModule('express', () => {
+  return {
+    default: mockedExpress,
+  };
+});
+const getServer = (await import('.')).default;
+
+describe('getServer', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('returns a mock server if audit URL is defined', () => {
+    const mockListen = jest.fn();
+    console.log = jest.fn();
+
+    const { server } = getServer({ auditUrl: '/' });
+    expect(server.listen).toBeDefined();
+    server.listen(mockListen);
+    expect(mockListen).toHaveBeenCalled();
+    expect(console.log.mock.calls[0][0]).toEqual('Scanning url /');
+
+    expect(server.close).toBeDefined();
+    expect(server.close()).toBeUndefined();
+    expect(server.url).toEqual('/');
+  });
+
+  it('throws an error if no audit URL and no serveDir', () => {
+    expect(() => getServer({})).toThrow('Empty publish dir');
+  });
+
+  it('returns an express server if no audit URL and a serveDir', () => {
+    const { server } = getServer({ serveDir: 'dir' });
+    expect(mockStatic).toHaveBeenCalled();
+
+    // Check we log when we start serving directory
+    server.listen(jest.fn());
+    expect(console.log.mock.calls[0][0]).toEqual(
+      'Serving and scanning site from directory dir',
+    );
+
+    expect(server.url).toEqual('http://localhost:5100');
+
+    // Check close method closes the given instance
+    const close = jest.fn();
+    server.close({ close });
+    expect(close).toHaveBeenCalled();
+  });
+});