Test-Driven Python Development

Documenting our tests

When we run the tests, we get the following output:

.E
==================================================================
ERROR: test_stock_update (__main__.StockTest)
An update should set the price on the stock object
------------------------------------------------------------------
Traceback (most recent call last):
  File "stock_alerter\stock.py", line 22, in test_stock_update
    goog.update(datetime(2014, 2, 12), price=10)
AttributeError: 'Stock' object has no attribute 'update'

------------------------------------------------------------------
Ran 2 tests in 0.001s
FAILED (errors=1)

The test fails as expected, but the interesting thing is that the first line of the docstring is printed out on the fourth line. This is useful ...