Improved TestCase Class

dectest.TestCase is a drop-in replacement for unittest.TestCase with a few added features.

Tests, Setup, and Teardown with Decorators

Tests can optionally be marked using the @test decorator, instead of prefixing the method name with test. The following test case class contains two tests:

from dectest import TestCase, test

class MyTest(TestCase):
    def test_foo(self):
        pass

    @test
    def bar(self):
        pass

Setup and teardown methods can be marked using the @before and @after decorators, respectively. A class can have multiple setup and teardown methods:

from dectest import TestCase, before, after

class MyTest(TestCase):
    @before
    def setup_stuff(self):
        pass
    
    @before
    def setup_more_stuff(self):
        pass
        
    @after
    def teardown_all_stuff(self):
        pass

While the order of execution inside a class is undefined and should not be relied upon, it is guaranteed that setup methods in super-classes are executed before methods in sub-classes, and teardown methods in sub-classes are executed before teardown method in super-classes:

from dectest import TestCase, before, after

class MySuperTest(TestCase):
    @before
    def super_setup(self):
        print("setup first")
    
    @after
    def super_teardown(self):
        print("teardown second")

class MySubTest(MySuperTest):
    @before
    def sub_setup(self):
        print("setup second")

    @after
    def sub_teardown(self):
        print("teardown first")

Patch Support

dectest.TestCase has a patch() method to install a mock using unittest.mock.patch(). This patch is removed during test teardown:

from dectest import TestCase, test

class MyPatchTest(TestCase):
    @test
    def foo(self):
        exit = self.patch("sys.exit")  # will be stopped during teardown
        # call implementation
        exit.assert_called_with(1)