Python unit-testing with nose: Making sequential tests
I am just learning how to do unit-testing. I'm on Python / nose / Wing IDE.
(The project that I'm writing tests for is a simulations framework, and among other things it lets you run simulations both synchronously and asynchronously, and the results of the simulation should be the same in both.)
The thing is, I want some of my tests to use simulation results that were created in other tests. For example,
synchronous_test calculates a certain simulation in synchronous mode, but then I want to calculate it in asynchronous mode, and check that the results came out the same.
How do I structure this? Do I put them all in one test function, or make a separate
asynchronous_test? Do I pass these objects from one test function to another?
Also, keep in mind that all these tests will run through a test generator, so I can do the tests for each of the simulation packages included with my program.
Asked by: Gianna883 | Posted: 06-12-2021
You can add tests that need to calculate once per class to the "setup" of that class. As an example:
Answered by: Aston100 | Posted: 07-01-2022
from nose.tools import * class Test_mysim(): def setup(self): self.ans = calculate_it_once() def test_sync(self): ans=calculate_it_sync() assert_equal(ans,self.ans) def test_async(self): ans=calculate_it_async() assert_equal(ans,self.ans)
In general, I'd recommend not making one test depend upon another. Do the synchronous_test, do the asynchronous_test, compare them each to the expected correct output, not to each other.
So something like:
Answered by: Vivian766 | Posted: 07-01-2022
class TestSimulate(TestCase): def setup(self): self.simpack = SimpackToTest() self.initial_state = pickle.load("initial.state") self.expected_state = pickle.load("known_good.state") def test_simulate(self): state = simulate(self.simpack, self.initial_state) # assert_equal will require State to implement __eq__ in a meaningful # way. If it doesn't, you'll want to define your own comparison # function. self.assert_equal(self.expected_state, state) def test_other_simulate(self): foo = OtherThing(self.simpack) blah = foo.simulate(self.initial_state) state = blah.state self.assert_equal(self.expected_state, state)
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