test: ensure that the reporter is working correctly (#72)

.travis.yml

@@ -1,3 +1,10 @@
 language: node_js
 node_js:
   - '10.13'
+before_script:
+  - export DISPLAY=:99.0
+  - export CHROME_PATH="$(pwd)/chrome-linux/chrome"
+services:
+  - xvfb
+addons:
+  chrome: stable

__tests__/reporter.test.js

@@ -0,0 +1,22 @@
+const writeReport = require('../lib/lighthouse-reporter');
+
+describe('Reporter', () => {
+  it('should launch Chrome and generate a report', async () => {
+    jest.setTimeout(20000); // Allows more time to run all tests
+    const result = await writeReport('http://www.google.com');
+    expect(result).toEqual(
+      expect.objectContaining({
+        categoryReport: {
+          performance: expect.any(Number),
+          accessibility: expect.any(Number),
+          'best-practices': expect.any(Number),
+          seo: expect.any(Number),
+          pwa: expect.any(Number),
+        },
+        budgetsReport: expect.any(Object),
+        htmlReport: expect.any(Object),
+        jsonReport: expect.any(Object),
+      }),
+    );
+  });
+});