python 测试框架之---testtools

在tempest框架中,使用的是testtools为基础框架来运行接口自动化

一、初识

testools是属于python中诸多自动化框架中的一个,官方文档如下:

http://testtools.readthedocs.io/en/latest/overview.html

但是,官方中的例子还有一个myproject基础文件,让很多同学很困惑,下面我们看看使用testtool最简单的框架,如下

from testtools import TestCase


class TestLearnTesttools(TestCase):

    def setUp(self):
        super(TestLearnTesttools, self).setUp()
        print "this is setUp"

    def test_case_1(self):
        self.assertIn('a', 'cat')

    def test_case_2(self):
        assert 2 == 3

    def tearDown(self):
        super(TestLearnTesttools, self).tearDown()
        print "this is tearDown"

    @classmethod
    def setUpClass(cls):
        print "this is setUp class"

 

注意,setUp必须写super,不然会报如下错误

TestCase.setUp was not called. Have you upcalled all the way up the hierarchy fr
om your setUp? e.g. Call super(TestLearnTesttools, self).setUp() from your setUp
().

不然你就不要写setUp,这点感觉这个框架好奇葩...

运行结果如下:

E:\workspace\test_case>python -m testtools.run testtools_learn.py
Tests running...
this is setUp class
this is setUp
this is tearDown
this is setUp
this is tearDown
======================================================================
FAIL: testtools_learn.TestLearnTesttools.test_case_2
----------------------------------------------------------------------
Traceback (most recent call last):
  File "testtools_learn.py", line 22, in test_case_2
    assert 2==3
AssertionError

Ran 2 tests in 0.005s
FAILED (failures=1)

在官网中,testtool可以使用很多种方式来运行,直接贴过来吧

那下面我们用nose来运行一下看看:

E:\workspace\test_case>nosetests -s -v testtools_learn.py
ALL starting...
this is setUp class
test_case.testtools_learn.TestLearnTesttools.test_case_1 ... this is setUp
this is tearDown
ok
test_case.testtools_learn.TestLearnTesttools.test_case_2 ... this is setUp
this is tearDown
FAIL

======================================================================
FAIL: test_case.testtools_learn.TestLearnTesttools.test_case_2
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "E:\workspace\nosetest_lear\test_case\testtools_learn.py", line 22, in te
st_case_2
    assert 2==3
AssertionError


----------------------------------------------------------------------
Ran 2 tests in 0.012s

FAILED (failures=1)

感觉还是nose的格式好看。

 

二、了解

既然知道testtool是怎么写及怎么运行了,我们来仔细看看,testtools到底是个什么东东

还是看官网,可以得知道,testtools是python标准库中unittest的扩展,从testtools源码中可以看到,继承的还是unittest2.TestCase

class TestCase(unittest.TestCase):
    """Extensions to the basic TestCase.

    :ivar exception_handlers: Exceptions to catch from setUp, runTest and
        tearDown. This list is able to be modified at any time and consists of
        (exception_class, handler(case, result, exception_value)) pairs.
    :ivar force_failure: Force testtools.RunTest to fail the test after the
        test has completed.
    :cvar run_tests_with: A factory to make the ``RunTest`` to run tests with.
        Defaults to ``RunTest``.  The factory is expected to take a test case
        and an optional list of exception handlers.
    """

    skipException = TestSkipped

    run_tests_with = RunTest
View Code

至于为什么要使用Testtools,官网上也说了,

1、有更好的断言方式

testtool加了assertInassertIsassertIsInstance及其它的。

虽然unittest标准库中也有这3个方式,但这3个方式是python 2.7之后才有的

具体testtool的断言优化可以到这里testtools.assertions查询

特别用法举例,来源网上

assertThat

def test_abs(self):
    result = abs(-7)
    self.assertEqual(result, 7)
    self.assertNotEqual(result, 7)
    self.assertThat(result, testtools.matchers.Equals(7))
    self.assertThat(result, testtools.matchers.Not(Equals(8)))

expectFailure

def test_expect_failure_example(self):
    self.expectFailure(
        "cats should be dogs", self.assertEqual, 'cats''dogs')

2、更多调试手段

在测试过程中,如果你想得到更多的错误信息,可以使用TestCase.addDetail

TestCase.addDetail具体使用这里不写,感觉没用

3、fixtures

测试用例一般都包含一个 setUp 方法来准备测试环境,主要是生成一些测试过程中

会用到的变量与对象。有时候我们会需要在不同的测试用例间共享这些变量与对象,避免

在每一个测试用例中重复定义。所以就有了 fixtures,它制定了一套规范,将测试代码与

环境准备代码分离开来,使得测试代码亦可方便的组织和扩展。

class SomeTest(TestCase):
    def setUp(self):
        super(SomeTest, self).setUp()
        self.server = self.useFixture(Server())

4、Skipping tests

检测到环境不符合要求的情况下,忽略某些测试

def test_make_symlink(self):
    symlink = getattr(os, 'symlink', None)
    if symlink is None:
        self.skipTest("No symlink support")
    symlink(whatever, something_else)

5、Test attributes

标签,与nose框架中的attr一样的道理,testtool中同样支持,使用时使用的参数是--load-list

from testtools.testcase import attr, WithAttributes

class AnnotatedTests(WithAttributes, TestCase):

    @attr('simple')
    def test_one(self):
        pass

    @attr('more', 'than', 'one')
    def test_two(self):
        pass

    @attr('or')
    @attr('stacked')
    def test_three(self):
        pass

6、自定义的错误输入

self.exception_handlers.insert(-1, (ExceptionClass, handler)).

这样,在任何一个setUp teardown或测试用例中raise ExceptionClass都会调用

更多的用法请查阅framework folk

posted @ 2017-04-26 18:29  Believer007  阅读(4798)  评论(0编辑  收藏  举报