ADD unzip support

__test__/assets/unzip.spec.js

@@ -0,0 +1,50 @@
+const { EventEmitter } = require('events');
+const unzipper = require('unzipper');
+const unzip = require('../../src/assets/unzip');
+
+jest.mock('unzipper', () => ({
+  Extract: jest.fn()
+}));
+
+describe('unzip()', () => {
+
+  let unzipEvents, pipe, onSuccess, onError;
+
+  beforeEach(() => {
+    unzipEvents = new EventEmitter();
+
+    pipe = jest.fn();
+    onSuccess = jest.fn();
+    onError = jest.fn();
+
+    pipe.mockReturnValueOnce({ pipe });
+    unzipper.Extract.mockReturnValueOnce(unzipEvents);
+  });
+
+  it('should download resource and unzip to given binPath', () => {
+
+    unzip({ opts: { binPath: './bin', binName: 'command' }, req: { pipe }, onSuccess, onError });
+
+    expect(unzipper.Extract).toHaveBeenCalledWith({ path: './bin' });
+  });
+
+  it('should call onSuccess on unzip close', () => {
+
+    unzip({ opts: { binPath: './bin', binName: 'command' }, req: { pipe }, onSuccess, onError });
+
+    unzipEvents.emit('close');
+
+    expect(onSuccess).toHaveBeenCalled();
+  });
+
+  it('should call onError with error on unzip error', () => {
+
+    const error = new Error();
+
+    unzip({ opts: { binPath: './bin', binName: 'command' }, req: { pipe }, onSuccess, onError });
+
+    unzipEvents.emit('error', error);
+
+    expect(onError).toHaveBeenCalledWith(error);
+  });
+});