bank-account: update README using configlet

exercises/bank-account/README.md

@@ -34,12 +34,30 @@ every exercise will require you to raise an exception, but for those that do, th
 a message.
 
 To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
-`raise Exception`, you shold write:
+`raise Exception`, you should write:
 
 ```python
 raise Exception("Meaningful message indicating the source of the error")
 ```
 
+## Running the tests
+
+To run the tests, run the appropriate command below ([why they are different](https://github.com/pytest-dev/pytest/issues/1629#issue-161422224)):
+
+- Python 2.7: `py.test bank_account_test.py`
+- Python 3.3+: `pytest bank_account_test.py`
+
+Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version):
+`python -m pytest bank_account_test.py`
+
+### Common `pytest` options
+
+- `-v` : enable verbose output
+- `-x` : stop running tests on first failure
+- `--ff` : run failures from previous test before running other test cases
+
+For other options, see `python -m pytest -h`
+
 ## Submitting Exercises
 
 Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/bank-account` directory.
@@ -50,4 +68,5 @@ For more detailed information about running tests, code style and linting,
 please see the [help page](http://exercism.io/languages/python).
 
 ## Submitting Incomplete Solutions
+
 It's possible to submit an incomplete solution so you can see how others have completed the exercise.