Single runner invocation

By default, each Espresso test case is invoked separately using the test runner. There is reduced shared state between different test cases as each test runs in its own instrumentation instance. With this default workflow, there is overall greater stability for your tests in general.

However, this will increase overall execution time for your build as each test case spawns a new instrumentation process. Alternatively, you can disable this behavior and execute all test cases together with a single test runner invocation (on each device). This can help significantly speed up the test execution time. To do so, you can use the singleRunnerInvocation parameter in the REST API request to start your test execution.

REST API endpoint:

POST /app-automate/espresso/v2/build

Example cURL request to start the execution of your Espresso tests:

curl -u "YOUR_USERNAME:YOUR_ACCESS_KEY" \
-X POST "https://api-cloud.browserstack.com/app-automate/espresso/v2/build" \
-d '{"singleRunnerInvocation": "true", "devices": ["Samsung Galaxy S8-7.0"], "app": "bs://f7c874f21852ba57957a3fdc33f47514288c4ba4", "testSuite": "bs://e994db8333e32a5863938666c3c3491e778352ff"}' \
-H "Content-Type: application/json"