How to run a single unit test using gradle wrapper 2.2.1 from command line

Question

Using Android studio with gradle wrapper version 2.2.1, I am trying to run all the tests in one single test class, as well as a specific test inside that class and have tried using:

./gradlew  test --tests DownloadsActivityTest

like the documentation suggests, as well as

-DandroidTest.single=DownloadsActivityTest

But neither of these versions work.

How do I run a single test class, and a single test from the command line using the gradle wrapper?

 ./gradlew --version

------------------------------------------------------------
Gradle 2.2.1
------------------------------------------------------------

Build time:   2014-11-24 09:45:35 UTC
Build number: none
Revision:     6fcb59c06f43a4e6b1bcb401f7686a8601a1fb4a

Groovy:       2.3.6
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.7.0_51 (Oracle Corporation 24.51-b03)
OS:           Linux 3.17.6-200.fc20.x86_64 amd64

[16:33][j@localhost:~/myHomeDir]$ ./gradlew  test --tests DownloadsActivityTest
WARNING: Dependency commons-logging:commons-logging:1.1.1 is ignored for debugTest as it may be conflicting with the internal version provided by Android.
     In case of problem, please repackage it with jarjar to change the class packages
WARNING: Dependency org.apache.httpcomponents:httpclient:4.0.3 is ignored for debugTest as it may be conflicting with the internal version provided by Android.
     In case of problem, please repackage it with jarjar to change the class packages

FAILURE: Build failed with an exception.

* What went wrong:
Problem configuring task :app:test from command line.
> Unknown command-line option '--tests'.

* Try:
Run gradlew help --task :app:test to get task usage details. Run with --stacktrace     option to get the stack trace. Run with --info or --debug                                                                                                                                  option to get more log output.

BUILD FAILED

Total time: 4.466 secs

Answer 1

To only run instrumentation tests (androidTests) in a specific test class, execute:

./gradlew app:connectedAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=com.example.android.testing.blueprint.ui.espresso.EspressoTest

To only run local tests ("unit", JVM tests) in a specific test class or package execute:

./gradlew :app:testDebugUnitTest --tests "com.example.android.testing.blueprint.unit.integrationTests.*"