Example code from the book Test-Driven Development By Example by Kent Beck

tdd-example-part-2

#!/usr/bin/env python

'''
TODO
1. Invoke tearDown even if the test method fails
2. Catch and report setUp errors
3. Create TestSuite from a TestCase class
'''
class TestCase(object):
    def __init__(self, name):
        self.name = name

    def setUp(self):
        pass

    def run(self, result):
        result.testStarted()
        self.setUp()
        try:
            method = getattr(self, self.name)
            method()
        except Exception as error:
            if not error:
                print error
            result.testFailed()
        self.tearDown()
        return result

    def tearDown(self):
        pass

class TestResult(object):
    def __init__(self):
        self.runCount = 0
        self.errorCount = 0

    def testStarted(self):
        self.runCount += 1

    def testFailed(self):
        self.errorCount += 1

    def summary(self):
        return "%d run, %d failed" % (self.runCount, self.errorCount)

class WasRun(TestCase):
    def __init__(self, name):
        TestCase.__init__(self, name)

    def setUp(self):
        self.log = "setUp "

    def testMethod(self):
        self.log += "testMethod "

    def testBrokenMethod(self):
        raise Exception

    def tearDown(self):
        self.log += "tearDown "

class TestCaseTest(TestCase):
    def setUp(self):
        self.result = TestResult()

    def testTemplateMethod(self):
        test = WasRun("testMethod")
        test.run(self.result)
        assert("setUp testMethod tearDown " == test.log)

    def testResult(self):
        test = WasRun("testMethod")
        test.run(self.result)
        assert("1 run, 0 failed" == self.result.summary())

    def testFailedResult(self):
        test = WasRun("testBrokenMethod")
        test.run(self.result)
        assert("1 run, 1 failed" == self.result.summary())

    def testFailedResultFormatting(self):
        self.result.testStarted()
        self.result.testFailed()
        assert("1 run, 1 failed" == self.result.summary())

    def testSuite(self):
        suite = TestSuite()
        suite.add(WasRun("testMethod"))
        suite.add(WasRun("testBrokenMethod"))
        suite.run(self.result)
        assert("2 run, 1 failed" == self.result.summary())

class TestSuite(object):
    def __init__(self):
        self.tests = []

    def add(self, test):
        self.tests.append(test)

    def run(self, result):
        for test in self.tests:
            test.run(result)

suite = TestSuite()
suite.add(TestCaseTest("testTemplateMethod"))
suite.add(TestCaseTest("testResult"))
suite.add(TestCaseTest("testFailedResult"))
suite.add(TestCaseTest("testFailedResultFormatting"))
suite.add(TestCaseTest("testSuite"))
result = TestResult()
suite.run(result)
print result.summary()