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* If the MOZ_HOST_BIN environment variable points to a directory containing xpcshell, that directory will be used for host utilities; otherwise, mach will offer to download and setup host utilities for you.
== Front-end-centric tests test notes ==(In the interest of removing duplication) For basic details & run instructions, see [[#Quick reference]].
=== JUnit4 tests ===(Note mcomella 5/5/16: they don't all pass for me locally) These jobs run on [http://robolectric.org/ Robolectric], which mocks various Android libraries so you can write integration tests as unit tests. [http://mockito.org/ Mockito] is also supported for mocking (see [http://mxr.mozilla.org/mozilla-central/source/mobile/android/tests/background/junit4/src/org/mozilla/gecko/dlc/TestVerifyAction.java TestVerifyAction for a sample]). You can also run specific tests from the IDE by selecting the "Build Variants" menu (bottom left), changing "Test Artifact" to "Unit Tests", right-clicking on the test class you want to run, and selecting the "Run <test-class>" option. === integration tests ===
You can run specific tests locally in the IDE by selecting the "Build Variants" menu (bottom left), changing "Test Artifact" to "Android Instrumentation Tests", right-clicking on the test class you want to run, and selecting the "Run <test-class>" option.
These do not run in automation so junit tests (via robolectric) or robocop tests (which are integration tests with a UI component) are generally preferred.
=== robocop UI tests ===
[[Auto-tools/Projects/Robocop|General Robocop information]] and http://mxr.mozilla.org/mozilla-central/source/mobile/android/tests/browser/robocop/README.rst.
