[doc] Replace runtest.py with mini_test.py in documentation. (#3750)

Rename `xray_test.py` to `mini_test.py` and use that in the documentation. Right now we suggest that people run `runtest.py`, but that often doesn't succeed and takes too long.

.travis.yml

@@ -157,7 +157,7 @@ script:
   - python -m pytest -v --durations=10 python/ray/test/test_global_state.py
   - python -m pytest -v --durations=10 python/ray/test/test_queue.py
   - python -m pytest -v --durations=10 python/ray/test/test_ray_init.py
-  - python -m pytest -v --durations=10 test/xray_test.py
+  - python -m pytest -v --durations=10 test/mini_test.py
 
   - python -m pytest -v --durations=10 test/runtest.py
   - python -m pytest -v --durations=10 test/array_test.py

doc/source/development.rst

@@ -44,7 +44,7 @@ helpful.
    .. code-block:: shell
 
      cd ray
-     python test/runtest.py APITest.testKeywordArgs
+     python -m pytest -v test/runtest.py::test_keyword_args
 
    When running tests, usually only the first test failure matters. A single
    test failure often triggers the failure of subsequent tests in the same

doc/source/install-on-docker.rst

@@ -148,7 +148,7 @@ container shell enter the following commands:
 
 .. code-block:: bash
 
-  python test/runtest.py # This tests basic functionality.
+  python -m pytest -v test/mini_test.py  # This tests some basic functionality.
 
 You are now ready to continue with the `tutorial`_.
 

doc/source/installation.rst

@@ -116,8 +116,7 @@ that you've cloned the git repository.
 
 .. code-block:: bash
 
-  export PYTHONPATH="$PYTHONPATH:./test/"
-  python -m pytest test/runtest.py
+  python -m pytest -v test/mini_test.py
 
 Cleaning the source tree
 ~~~~~~~~~~~~~~~~~~~~~~~~