Gradle build fail: Process ‘Gradle Test Executor 1’ finished with non-zero exit value 1

Try cleaning your daemons with ./gradlew --stop. It works for me.
This was my error. also sometimes I got an IDLE at the end of the build and never ends.

* What went wrong:
Execution failed for task ':test'.
> A problem occurred starting process 'Gradle Test Executor 1'