《测试驱动开发》中使用Python开发测试工具

最近在看《测试驱动开发 by example》，发现从测试开始进行设计与编码确实很有意思。

于是本人花了点时间，把第二部分xUnit中清单上的剩余条目全部补充实现了。

完整代码如下：

'''
Created on 2011-12-10

@author: Mnid
'''

class TestCase(object):
    def __init__(self, name):
        self.name= name
    
    def setUp(self):
        pass
    def tearDown(self):
        pass
    def run(self, result):
        result.testStarted()
        try:
            self.setUp()
        except:
            self.tearDown()
            return None
        try:
            method = getattr(self, self.name)
            method()
        except:
            result.testFailed()
        self.tearDown()
    
    def summary(self):
        pass

    
    def createSuite(self, name):
        self.name = name
        return TestSuite()
    


class WasRun(TestCase):
    def __init__(self, name):
        self.wasRun= None
        TestCase.__init__(self, name)
    
    def setUp(self):
        self.wasRun= None
        self.log = "setUp"
        
    def testSetUp(self):
        self.setUp()
    
    def tearDown(self):
        self.wasRun = None
        self.log += " tearDown"
    
    def testMethod(self):
        self.wasRun= 1
        self.log += " testMethod"
        
    def testBrokenMethod(self):
        raise Exception


class TestResult(TestCase):
    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 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)


class TestFailedSetUp(TestCase):
    def setUp(self):
        self.log = "setUp"
        raise Exception
    def testRun(self):
        self.log += "can't be here"
    def tearDown(self):
        self.log += " tearDown"
        
class TestFailedRun(TestCase):
    def setUp(self):
        self.log = "setUp"
    def testRun(self):
        self.log += " can be here"
        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 testSuite(self):
        suite = TestSuite()
        suite.add(WasRun("testMethod"))
        suite.add(WasRun("testBrokenMethod"))
        suite.run(self.result)
        assert("2 run, 1 failed" == self.result.summary())
        
    def testFailedResultFormatting(self):
        self.result.testStarted()
        self.result.testFailed()
        assert("1 run, 1 failed" == self.result.summary())
        
    def testFailedSetUp(self):
        test = TestFailedSetUp("testRun")
        test.run(self.result)
        assert("setUp tearDown" == test.log)
        
    def testTearDownFailedMethod(self):
        test = TestFailedRun("testRun")
        test.run(self.result)
        assert("setUp can be here tearDown" == test.log)
        
    def testCreateSuite(self):
        suite = self.createSuite("One Test")
        suite.add(WasRun("testMethod"))
        suite.run(self.result)
        assert("1 run, 0 failed" == self.result.summary())

suite = TestCase("TestCase").createSuite("Test For All")
suite.add(TestCaseTest("testTemplateMethod"))
suite.add(TestCaseTest("testResult"))
suite.add(TestCaseTest("testFailedResult"))
suite.add(TestCaseTest("testFailedResultFormatting"))
suite.add(TestCaseTest("testSuite"))
suite.add(TestCaseTest("testFailedSetUp"))
suite.add(TestCaseTest("testTearDownFailedMethod"))
suite.add(TestCaseTest("testCreateSuite"))
result = TestResult()
suite.run(result)
print(result.summary())