☞

Program Repair Shop

62

Test suite

• Throughout, I kept running against the original test suite

• This has some drawbacks:

• The test suite is incomplete

• It didn't detect the gross failure in delete_observer, for example

• It also missed several bugs in my version along the way

• Some tests checked undocumented behavior

• That is a maintenance programmer's nightmare

• You run the test suite and some tests fail

• Then you dig into the tests to figure out what they are doing

• When you're done, you do not know what the problem is

• Are the tests broken?

• Or is your implementation broken?

☞

☞