chore: fix flaky tests in CLI mock (#437)

* chore: fix flaky tests in CLI mock

* fix cli tests

* switch off screenshots for tls

__tests__/cli.test.ts

@@ -187,6 +187,7 @@ describe('CLI', () => {
       ])
       .run();
     await cli.waitFor('journey/end');
+    expect(await cli.exitCode).toBe(0);
 
     const data = safeParse(cli.buffer());
     const screenshotRef = data.find(
@@ -201,9 +202,7 @@ describe('CLI', () => {
 
     const traceData = data.find(({ type }) => type === 'step/metrics');
     expect(traceData).toBeDefined();
-
-    expect(await cli.exitCode).toBe(0);
-  }, 30000);
+  });
 
   it('override screenshots with `--rich-events` flag', async () => {
     const cli = new CLIMock()
@@ -215,10 +214,9 @@ describe('CLI', () => {
       ])
       .run();
     await cli.waitFor('journey/end');
-    const screenshots = cli
-      .buffer()
-      .map(data => JSON.parse(data))
-      .find(({ type }) => type === 'step/screenshot_ref');
+    const screenshots = safeParse(cli.buffer()).find(
+      ({ type }) => type === 'step/screenshot_ref'
+    );
     expect(screenshots).not.toBeDefined();
     expect(await cli.exitCode).toBe(0);
   });
@@ -366,6 +364,8 @@ describe('CLI', () => {
         JSON.stringify({ url: tlsServer.TEST_PAGE }),
         '--reporter',
         'json',
+        '--screenshots',
+        'off',
       ];
     });
 
@@ -559,7 +559,7 @@ class CLIMock {
       this.data = data.toString();
       // Uncomment the line below if the process is blocked and you need to see its output
       // console.log('CLIMock.stdout:', this.data);
-      this.chunks.push(...this.data.split('\n').filter(Boolean));
+      this.chunks.push(this.data);
       if (this.waitForPromise && this.data.includes(this.waitForText)) {
         this.process.stdout.off('data', dataListener);
         this.waitForPromise();
@@ -588,6 +588,9 @@ class CLIMock {
   }
 
   buffer() {
-    return this.chunks;
+    // Merge all the interleaved chunks from stdout and
+    // split them on new line as synthetics runner writes the
+    // JSON output in separate lines for every event.
+    return this.chunks.join('').split('\n').filter(Boolean);
   }
 }

__tests__/fixtures/example.journey.ts

@@ -27,7 +27,7 @@ import { journey, step } from '../../';
 
 journey('example journey', ({ page, params }) => {
   step('go to test page', async () => {
-    await page.goto(params.url, { timeout: 1500 });
+    await page.goto(params.url, { waitUntil: 'networkidle' });
     await page.evaluate(() => window.performance.mark('page-loaded'));
     await page.waitForSelector('h2.synthetics', { timeout: 1500 });
   });

__tests__/plugins/network.test.ts

@@ -114,17 +114,20 @@ describe('network', () => {
 
   it('timings for aborted requests', async () => {
     const driver = await Gatherer.setupDriver({ wsEndpoint });
+    await driver.client.send('Network.setCacheDisabled', {
+      cacheDisabled: true,
+    });
     const network = new NetworkManager(driver);
     await network.start();
 
     const delayTime = 20;
-    server.route('/delay100', async (req, res) => {
+    server.route('/delay20', async (req, res) => {
       await delay(delayTime);
       res.destroy();
     });
     server.route('/index', async (_, res) => {
       res.setHeader('content-type', 'text/html');
-      res.end(`<script src=${server.PREFIX}/delay100 />`);
+      res.end(`<script src=${server.PREFIX}/delay20 />`);
     });
 
     await driver.page.goto(server.PREFIX + '/index');
@@ -133,7 +136,7 @@ describe('network', () => {
     const netinfo = await network.stop();
     expect(netinfo.length).toBe(2);
     expect(netinfo[1]).toMatchObject({
-      url: `${server.PREFIX}/delay100`,
+      url: `${server.PREFIX}/delay20`,
       response: {
         headers: {},
         mimeType: 'x-unknown',