How to run all test scripts on a single browser instance

I am using Testcafe (free version) with Java Script. I want to run all my test cases (resides in multiple test scripts in __test__ directory) in a single browser instance (That way 1 time log in) per browser type.

1. For example, 1 instance for chrome and 1 instance for safari but all tests will run before closing the browser.
2. If a test fails, I want the screenshot is taken and count number of the test failures. But do want to continue.
3. I'm doing all on Node 12 Docker image, so it is best if I don't need to install anything else.

How do I do this with Testcafe?

const createTestCafe = require('testcafe') let testcafe = null let runner = null createTestCafe('localhost', 1337, 1338) .then(tc => { testcafe = tc const runner = testcafe.createRunner() return runner .src([ '__test__/*.js' ]) .browsers([ 'chrome:headless --no-sandbox --disable-gpu', 'safari' ]) .screenshots('./reports/screenshots/', true) .run({ selectorTimeout: 10000, assertionTimeout: 10000, }) }) runner .screenshots({ path: 'reports/screenshots/', takeOnFails: true, }) .then(failedCount => { console.log('Tests failed: ' + failedCount) testcafe.close() }) .catch(error => { console.log("An ERROR detected:" + error) }) 

This is how you install chrome on Dockerfile. Can someone tell me how to install Firefox on Dockerfile?

RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' && \ http_proxy=${http_proxy} https_proxy=${https_proxy} apt-get update && \ http_proxy=${http_proxy} https_proxy=${https_proxy} apt-get install -y --allow-unauthenticated google-chrome-stable && \ apt clean && rm -rf /var/lib/apt/lists/*