tests: added new setup configuration + test args (#211)

- added utils for future tests and conftest
- added test args

rl_coach/tests/README.md

@@ -46,7 +46,7 @@ several parts, each testing the framework in different areas and strictness.
     The golden tests can be run using the following command:
     
     ```
-    python3 rl_coach/tests/test_golden.py
+    python3 -m pytest rl_coach/tests -m golden_test
     ```
 
 * **Trace tests** -
@@ -59,3 +59,19 @@ several parts, each testing the framework in different areas and strictness.
     ```
     python3 rl_coach/tests/trace_tests.py -prl
     ```
+
+* **Optional PyTest Flags** -
+
+    Using -k expr to select tests based on their name;
+    The -k command line option to specify an expression which implements a substring match on the test names
+    instead of the exact match on markers that -m provides. This makes it easy to select tests based on their names:
+    ```
+    python3 -m pytest rl_coach/tests -k Doom
+    ```
+    Using -v (--verbose) expr to show tests progress during running the tests, -v can be added with -m or with -k, to use -v see
+    the following commands:
+    ```
+    python3 -m pytest rl_coach/tests -v -m golden_test
+    OR
+    python3 -m pytest rl_coach/tests -v -k Doom
+    ```