Questão 2044993

Considere o seguinte texto para responder as duas próximas questões (49 e 50):

Set the Table

When you begin writing tests, you will discover a common pattern:

1. Create some objects

2. Stimulate them

3. Check the results

While the stimulation and checking steps are unique test-to-test, the creation step is

often familiar. I have a 2 and 3. If I add them, I expect 5. If I subtract them, I expect –

1, if I multiply them, I expect 6. The stimulation and expected results are unique, the 2

and the 3 don’t change.

If this pattern repeats at different scales (and it does), then we’re faced with the

question of how often do we want to create new objects. Looking back at our initial set

of constraints, two constraints come into conflict:

· Performance—we would like our tests to run as quickly as possible

· Isolation—we would the success or failure of one test to be irrelevant to other

tests

For performance sake, assuming creating the objects (we’ll call them collectively the “fixture”) is

expensive, we would like to create them once and then run lots of tests.

But sharing objects between tests creates the possibility of test coupling. Test coupling

can have an obvious nasty effect, where breaking one test causes the next ten to fail

even though the code is correct. Test coupling can have a subtle really nasty effect,

where the order of tests matters. If I run A before B, they both work, but if I run B

before A, then A fails. Worse, the code exercised by B is wrong, but because A ran

first, the test passes.

Kent Beck – Test-Driven Development By Example. Addison-Wesley Professional; Edição: 1. Novembro, 2002. Page 82.

Based on the text it is correct to state about the coupling of tests that: