如何在目录中运行所有Python单元测试?

问题:如何在目录中运行所有Python单元测试?

我有一个目录,其中包含我的Python单元测试。每个单元测试模块的形式为test _ *。py。我正在尝试制作一个名为all_test.py的文件,您猜对了,它将以上述测试形式运行所有文件并返回结果。到目前为止,我已经尝试了两种方法。都失败了。我将展示这两种方法,并希望那里的人知道如何正确地正确执行此操作。

对于我的第一次英勇尝试,我想:“如果我只是将所有测试模块导入文件中,然后调用此unittest.main()doodad,它将起作用,对吗?” 好吧,原来我错了。

import glob
import unittest

testSuite = unittest.TestSuite()
test_file_strings = glob.glob('test_*.py')
module_strings = [str[0:len(str)-3] for str in test_file_strings]

if __name__ == "__main__":
     unittest.main()

这没有用,我得到的结果是:

$ python all_test.py 

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK

对于第二次尝试,我还是可以,也许我会尝试以“手动”方式进行整个测试。所以我尝试在下面这样做:

import glob
import unittest

testSuite = unittest.TestSuite()
test_file_strings = glob.glob('test_*.py')
module_strings = [str[0:len(str)-3] for str in test_file_strings]
[__import__(str) for str in module_strings]
suites = [unittest.TestLoader().loadTestsFromName(str) for str in module_strings]
[testSuite.addTest(suite) for suite in suites]
print testSuite 

result = unittest.TestResult()
testSuite.run(result)
print result

#Ok, at this point I have a result
#How do I display it as the normal unit test command line output?
if __name__ == "__main__":
    unittest.main()

这也没有用,但是似乎太接近了!

$ python all_test.py 
<unittest.TestSuite tests=[<unittest.TestSuite tests=[<unittest.TestSuite tests=[<test_main.TestMain testMethod=test_respondes_to_get>]>]>]>
<unittest.TestResult run=1 errors=0 failures=0>

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK

我似乎有一套类似的套件,可以执行结果。我有点担心它说我只有一个事实run=1,似乎应该是这样run=2,但这是进步。但是如何传递结果并将其显示给main?还是我基本上如何使它工作,以便我可以运行该文件,然后运行此目录中的所有单元测试?

I have a directory that contains my Python unit tests. Each unit test module is of the form test_*.py. I am attempting to make a file called all_test.py that will, you guessed it, run all files in the aforementioned test form and return the result. I have tried two methods so far; both have failed. I will show the two methods, and I hope someone out there knows how to actually do this correctly.

For my first valiant attempt, I thought “If I just import all my testing modules in the file, and then call this unittest.main() doodad, it will work, right?” Well, turns out I was wrong.

import glob
import unittest

testSuite = unittest.TestSuite()
test_file_strings = glob.glob('test_*.py')
module_strings = [str[0:len(str)-3] for str in test_file_strings]

if __name__ == "__main__":
     unittest.main()

This did not work, the result I got was:

$ python all_test.py 

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK

For my second try, I though, ok, maybe I will try to do this whole testing thing in a more “manual” fashion. So I attempted to do that below:

import glob
import unittest

testSuite = unittest.TestSuite()
test_file_strings = glob.glob('test_*.py')
module_strings = [str[0:len(str)-3] for str in test_file_strings]
[__import__(str) for str in module_strings]
suites = [unittest.TestLoader().loadTestsFromName(str) for str in module_strings]
[testSuite.addTest(suite) for suite in suites]
print testSuite 

result = unittest.TestResult()
testSuite.run(result)
print result

#Ok, at this point I have a result
#How do I display it as the normal unit test command line output?
if __name__ == "__main__":
    unittest.main()

This also did not work, but it seems so close!

$ python all_test.py 
<unittest.TestSuite tests=[<unittest.TestSuite tests=[<unittest.TestSuite tests=[<test_main.TestMain testMethod=test_respondes_to_get>]>]>]>
<unittest.TestResult run=1 errors=0 failures=0>

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK

I seem to have a suite of some sort, and I can execute the result. I am a little concerned about the fact that it says I have only run=1, seems like that should be run=2, but it is progress. But how do I pass and display the result to main? Or how do I basically get it working so I can just run this file, and in doing so, run all the unit tests in this directory?


回答 0

使用Python 2.7及更高版本,您无需编写新代码或使用第三方工具即可完成此操作。内置了通过命令行执行递归测试的功能。__init__.py在您的测试目录中放置:

python -m unittest discover <test_directory>
# or
python -m unittest discover -s <directory> -p '*_test.py'

您可以在python 2.7python 3.x unittest文档中阅读更多内容。

With Python 2.7 and higher you don’t have to write new code or use third-party tools to do this; recursive test execution via the command line is built-in. Put an __init__.py in your test directory and:

python -m unittest discover <test_directory>
# or
python -m unittest discover -s <directory> -p '*_test.py'

You can read more in the python 2.7 or python 3.x unittest documentation.


回答 1

您可以使用可以为您完成此任务的测试运行程序。 例如鼻子很好。运行时,它将在当前树中找到测试并运行它们。

更新:

这是我前鼻时期的一些代码。您可能不希望使用模块名称的明确列表,但是其余的名称可能对您有用。

testmodules = [
    'cogapp.test_makefiles',
    'cogapp.test_whiteutils',
    'cogapp.test_cogapp',
    ]

suite = unittest.TestSuite()

for t in testmodules:
    try:
        # If the module defines a suite() function, call it to get the suite.
        mod = __import__(t, globals(), locals(), ['suite'])
        suitefn = getattr(mod, 'suite')
        suite.addTest(suitefn())
    except (ImportError, AttributeError):
        # else, just load all the test cases from the module.
        suite.addTest(unittest.defaultTestLoader.loadTestsFromName(t))

unittest.TextTestRunner().run(suite)

You could use a test runner that would do this for you. nose is very good for example. When run, it will find tests in the current tree and run them.

Updated:

Here’s some code from my pre-nose days. You probably don’t want the explicit list of module names, but maybe the rest will be useful to you.

testmodules = [
    'cogapp.test_makefiles',
    'cogapp.test_whiteutils',
    'cogapp.test_cogapp',
    ]

suite = unittest.TestSuite()

for t in testmodules:
    try:
        # If the module defines a suite() function, call it to get the suite.
        mod = __import__(t, globals(), locals(), ['suite'])
        suitefn = getattr(mod, 'suite')
        suite.addTest(suitefn())
    except (ImportError, AttributeError):
        # else, just load all the test cases from the module.
        suite.addTest(unittest.defaultTestLoader.loadTestsFromName(t))

unittest.TextTestRunner().run(suite)

回答 2

在python 3中,如果您使用的是unittest.TestCase

  • 您的目录中必须有一个空(或其他)__init__.py文件test必须命名为test/
  • 您的测试文件test/与模式匹配test_*.py。它们可以位于下方的子目录中test/,并且这些子目录可以命名为任何东西。

然后,您可以使用以下命令运行所有测试:

python -m unittest

做完了!解决方案少于100行。希望其他python初学者可以通过查找此方法节省时间。

In python 3, if you’re using unittest.TestCase:

  • You must have an empty (or otherwise) __init__.py file in your test directory (must be named test/)
  • Your test files inside test/ match the pattern test_*.py. They can be inside a subdirectory under test/, and those subdirs can be named as anything.

Then, you can run all the tests with:

python -m unittest

Done! A solution less than 100 lines. Hopefully another python beginner saves time by finding this.


回答 3

现在,可以直接从unittest:unittest.TestLoader.discover进行此操作

import unittest
loader = unittest.TestLoader()
start_dir = 'path/to/your/test/files'
suite = loader.discover(start_dir)

runner = unittest.TextTestRunner()
runner.run(suite)

This is now possible directly from unittest: unittest.TestLoader.discover.

import unittest
loader = unittest.TestLoader()
start_dir = 'path/to/your/test/files'
suite = loader.discover(start_dir)

runner = unittest.TextTestRunner()
runner.run(suite)

回答 4

通过研究上面的代码(特别是使用TextTestRunnerdefaultTestLoader),我可以很接近了。最终,我通过仅将所有测试套件传递给单个套件的构造函数,而不是“手动”添加它们来修复了我的代码,从而解决了其他问题。所以这是我的解决方案。

import glob
import unittest

test_files = glob.glob('test_*.py')
module_strings = [test_file[0:len(test_file)-3] for test_file in test_files]
suites = [unittest.defaultTestLoader.loadTestsFromName(test_file) for test_file in module_strings]
test_suite = unittest.TestSuite(suites)
test_runner = unittest.TextTestRunner().run(test_suite)

是的,使用鼻子可能比这样做更容易,但这不重要。

Well by studying the code above a bit (specifically using TextTestRunner and defaultTestLoader), I was able to get pretty close. Eventually I fixed my code by also just passing all test suites to a single suites constructor, rather than adding them “manually”, which fixed my other problems. So here is my solution.

import glob
import unittest

test_files = glob.glob('test_*.py')
module_strings = [test_file[0:len(test_file)-3] for test_file in test_files]
suites = [unittest.defaultTestLoader.loadTestsFromName(test_file) for test_file in module_strings]
test_suite = unittest.TestSuite(suites)
test_runner = unittest.TextTestRunner().run(test_suite)

Yeah, it is probably easier to just use nose than to do this, but that is besides the point.


回答 5

如果要运行各种测试用例类中的所有测试,并且很乐意明确指定它们,则可以这样做:

from unittest import TestLoader, TextTestRunner, TestSuite
from uclid.test.test_symbols import TestSymbols
from uclid.test.test_patterns import TestPatterns

if __name__ == "__main__":

    loader = TestLoader()
    tests = [
        loader.loadTestsFromTestCase(test)
        for test in (TestSymbols, TestPatterns)
    ]
    suite = TestSuite(tests)

    runner = TextTestRunner(verbosity=2)
    runner.run(suite)

uclid我的项目在哪里,TestSymbols并且TestPatterns是的子类TestCase

If you want to run all the tests from various test case classes and you’re happy to specify them explicitly then you can do it like this:

from unittest import TestLoader, TextTestRunner, TestSuite
from uclid.test.test_symbols import TestSymbols
from uclid.test.test_patterns import TestPatterns

if __name__ == "__main__":

    loader = TestLoader()
    tests = [
        loader.loadTestsFromTestCase(test)
        for test in (TestSymbols, TestPatterns)
    ]
    suite = TestSuite(tests)

    runner = TextTestRunner(verbosity=2)
    runner.run(suite)

where uclid is my project and TestSymbols and TestPatterns are subclasses of TestCase.


回答 6

我使用了该discover方法和的重载load_tests来在(最少,我认为)数字行中实现此结果:

def load_tests(loader, tests, pattern):
''' Discover and load all unit tests in all files named ``*_test.py`` in ``./src/``
'''
    suite = TestSuite()
    for all_test_suite in unittest.defaultTestLoader.discover('src', pattern='*_tests.py'):
        for test_suite in all_test_suite:
            suite.addTests(test_suite)
    return suite

if __name__ == '__main__':
    unittest.main()

执行击掌,像

Ran 27 tests in 0.187s
OK

I have used the discover method and an overloading of load_tests to achieve this result in a (minimal, I think) number lines of code:

def load_tests(loader, tests, pattern):
''' Discover and load all unit tests in all files named ``*_test.py`` in ``./src/``
'''
    suite = TestSuite()
    for all_test_suite in unittest.defaultTestLoader.discover('src', pattern='*_tests.py'):
        for test_suite in all_test_suite:
            suite.addTests(test_suite)
    return suite

if __name__ == '__main__':
    unittest.main()

Execution on fives something like

Ran 27 tests in 0.187s
OK

回答 7

我尝试了各种方法,但似乎都存在缺陷,或者我必须编写一些代码,这很烦人。但是在Linux下,有一种简便的方法,就是简单地通过某种模式找到每个测试,然后逐个调用它们。

find . -name 'Test*py' -exec python '{}' \;

最重要的是,它肯定有效。

I tried various approaches but all seem flawed or I have to makeup some code, that’s annoying. But there’s a convinient way under linux, that is simply to find every test through certain pattern and then invoke them one by one.

find . -name 'Test*py' -exec python '{}' \;

and most importantly, it definitely works.


回答 8

对于打包的库或应用程序,您不想这样做。setuptools 会为你做

要使用此命令,您的项目的测试必须unittest通过函数,TestCase类或方法或包含TestCase类的模块或包来包装在测试套件中。如果命名套件是一个模块,并且该模块具有一个additional_tests()功能,则将其调用,并将结果(必须为unittest.TestSuite)添加到要运行的测试中。如果命名套件是一个包,则将所有子模块和子包递归地添加到整个测试套件中

只需告诉它您的根测试包在哪里,例如:

setup(
    # ...
    test_suite = 'somepkg.test'
)

然后跑 python setup.py test

除非您避免在测试套件中进行相对导入,否则在Python 3中基于文件的发现可能会出现问题,因为会discover使用文件导入。即使它支持optional top_level_dir,但是我还是有一些无限递归错误。因此,针对非打包代码的简单解决方案是将以下内容放入__init__.py测试包中(请参阅load_tests协议)。

import unittest

from . import foo, bar


def load_tests(loader, tests, pattern):
    suite = unittest.TestSuite()
    suite.addTests(loader.loadTestsFromModule(foo))
    suite.addTests(loader.loadTestsFromModule(bar))

    return suite

In case of a packaged library or application, you don’t want to do it. setuptools will do it for you.

To use this command, your project’s tests must be wrapped in a unittest test suite by either a function, a TestCase class or method, or a module or package containing TestCase classes. If the named suite is a module, and the module has an additional_tests() function, it is called and the result (which must be a unittest.TestSuite) is added to the tests to be run. If the named suite is a package, any submodules and subpackages are recursively added to the overall test suite.

Just tell it where your root test package is, like:

setup(
    # ...
    test_suite = 'somepkg.test'
)

And run python setup.py test.

File-based discovery may be problematic in Python 3, unless you avoid relative imports in your test suite, because discover uses file import. Even though it supports optional top_level_dir, but I had some infinite recursion errors. So a simple solution for a non-packaged code is to put the following in __init__.py of your test package (see load_tests Protocol).

import unittest

from . import foo, bar


def load_tests(loader, tests, pattern):
    suite = unittest.TestSuite()
    suite.addTests(loader.loadTestsFromModule(foo))
    suite.addTests(loader.loadTestsFromModule(bar))

    return suite

回答 9

我使用PyDev / LiClipse,但还没有真正弄清楚如何从GUI一次运行所有测试。(编辑:右键单击根测试文件夹,然后选择Run as -> Python unit-test

这是我当前的解决方法:

import unittest

def load_tests(loader, tests, pattern):
    return loader.discover('.')

if __name__ == '__main__':
    unittest.main()

我把这段代码放在一个名为 all测试目录中。如果我以LiClipse的单元测试形式运行此模块,则将运行所有测试。如果我只要求重复特定或失败的测试,则仅运行那些测试。它也不会干扰我的命令行测试运行程序(noestests)-被忽略。

您可能需要discover根据项目设置将参数更改为。

I use PyDev/LiClipse and haven’t really figured out how to run all tests at once from the GUI. (edit: you right click the root test folder and choose Run as -> Python unit-test

This is my current workaround:

import unittest

def load_tests(loader, tests, pattern):
    return loader.discover('.')

if __name__ == '__main__':
    unittest.main()

I put this code in a module called all in my test directory. If I run this module as a unittest from LiClipse then all tests are run. If I ask to only repeat specific or failed tests then only those tests are run. It doesn’t interfere with my commandline test runner either (nosetests) — it’s ignored.

You may need to change the arguments to discover based on your project setup.


回答 10

根据Stephen Cagle的回答,我添加了对嵌套测试模块的支持。

import fnmatch
import os
import unittest

def all_test_modules(root_dir, pattern):
    test_file_names = all_files_in(root_dir, pattern)
    return [path_to_module(str) for str in test_file_names]

def all_files_in(root_dir, pattern):
    matches = []

    for root, dirnames, filenames in os.walk(root_dir):
        for filename in fnmatch.filter(filenames, pattern):
            matches.append(os.path.join(root, filename))

    return matches

def path_to_module(py_file):
    return strip_leading_dots( \
        replace_slash_by_dot(  \
            strip_extension(py_file)))

def strip_extension(py_file):
    return py_file[0:len(py_file) - len('.py')]

def replace_slash_by_dot(str):
    return str.replace('\\', '.').replace('/', '.')

def strip_leading_dots(str):
    while str.startswith('.'):
       str = str[1:len(str)]
    return str

module_names = all_test_modules('.', '*Tests.py')
suites = [unittest.defaultTestLoader.loadTestsFromName(mname) for mname 
    in module_names]

testSuite = unittest.TestSuite(suites)
runner = unittest.TextTestRunner(verbosity=1)
runner.run(testSuite)

该代码搜索的所有子目录以.查找*Tests.py文件,然后将其加载。它期望每个*Tests.py都包含一个类*Tests(unittest.TestCase),该类依次加载并一个接一个地执行。

这适用于目录/模块的任意深度嵌套,但是之间的每个目录__init__.py至少需要包含一个空文件。这允许测试通过用点替换斜杠(或反斜杠)来加载嵌套模块(请参阅参考资料replace_slash_by_dot)。

Based on the answer of Stephen Cagle I added support for nested test modules.

import fnmatch
import os
import unittest

def all_test_modules(root_dir, pattern):
    test_file_names = all_files_in(root_dir, pattern)
    return [path_to_module(str) for str in test_file_names]

def all_files_in(root_dir, pattern):
    matches = []

    for root, dirnames, filenames in os.walk(root_dir):
        for filename in fnmatch.filter(filenames, pattern):
            matches.append(os.path.join(root, filename))

    return matches

def path_to_module(py_file):
    return strip_leading_dots( \
        replace_slash_by_dot(  \
            strip_extension(py_file)))

def strip_extension(py_file):
    return py_file[0:len(py_file) - len('.py')]

def replace_slash_by_dot(str):
    return str.replace('\\', '.').replace('/', '.')

def strip_leading_dots(str):
    while str.startswith('.'):
       str = str[1:len(str)]
    return str

module_names = all_test_modules('.', '*Tests.py')
suites = [unittest.defaultTestLoader.loadTestsFromName(mname) for mname 
    in module_names]

testSuite = unittest.TestSuite(suites)
runner = unittest.TextTestRunner(verbosity=1)
runner.run(testSuite)

The code searches all subdirectories of . for *Tests.py files which are then loaded. It expects each *Tests.py to contain a single class *Tests(unittest.TestCase) which is loaded in turn and executed one after another.

This works with arbitrary deep nesting of directories/modules, but each directory in between needs to contain an empty __init__.py file at least. This allows the test to load the nested modules by replacing slashes (or backslashes) by dots (see replace_slash_by_dot).


回答 11

这是一个老问题,但现在(2019年)对我有用的是:

python -m unittest *_test.py

我所有的测试文件都与源文件位于同一文件夹中,并以结尾_test

This is an old question, but what worked for me now (in 2019) is:

python -m unittest *_test.py

All my test files are in the same folder as the source files and they end with _test.


回答 12

由于测试发现似乎是一个完整的主题,因此存在一些专用的框架来测试发现:

在这里更多阅读:https : //wiki.python.org/moin/PythonTestingToolsTaxonomy

Because Test discovery seems to be a complete subject, there is some dedicated framework to test discovery :

More reading here : https://wiki.python.org/moin/PythonTestingToolsTaxonomy


回答 13

无论您位于哪个工作目录中,此BASH脚本都将从文件系统中的任何位置执行python unittest测试目录:其工作目录始终test位于该目录所在的位置。

所有测试,独立$ PWD

unittest Python模块对您的当前目录敏感,除非您告诉它当前位置(使用discover -s选项)。

当位于./src./example工作目录中并且需要快速的整体单元测试时,这很有用:

#!/bin/bash
this_program="$0"
dirname="`dirname $this_program`"
readlink="`readlink -e $dirname`"

python -m unittest discover -s "$readlink"/test -v

所选测试,独立$ PWD

我将此实用程序文件命名为:runone.py并按以下方式使用它:

runone.py <test-python-filename-minus-dot-py-fileextension>
#!/bin/bash
this_program="$0"
dirname="`dirname $this_program`"
readlink="`readlink -e $dirname`"

(cd "$dirname"/test; python -m unittest $1)

test/__init__.py在生产过程中不需要文件来负担您的程序包/内存开销。

This BASH script will execute the python unittest test directory from ANYWHERE in the file system, no matter what working directory you are in: its working directory always be where that test directory is located.

ALL TESTS, independent $PWD

unittest Python module is sensitive to your current directory, unless you tell it where (using discover -s option).

This is useful when staying in the ./src or ./example working directory and you need a quick overall unit test:

#!/bin/bash
this_program="$0"
dirname="`dirname $this_program`"
readlink="`readlink -e $dirname`"

python -m unittest discover -s "$readlink"/test -v

SELECTED TESTS, independent $PWD

I name this utility file: runone.py and use it like this:

runone.py <test-python-filename-minus-dot-py-fileextension>
#!/bin/bash
this_program="$0"
dirname="`dirname $this_program`"
readlink="`readlink -e $dirname`"

(cd "$dirname"/test; python -m unittest $1)

No need for a test/__init__.py file to burden your package/memory-overhead during production.


回答 14

这是我创建包装器以从命令行运行测试的方法:

#!/usr/bin/env python3
import os, sys, unittest, argparse, inspect, logging

if __name__ == '__main__':
    # Parse arguments.
    parser = argparse.ArgumentParser(add_help=False)
    parser.add_argument("-?", "--help",     action="help",                        help="show this help message and exit" )
    parser.add_argument("-v", "--verbose",  action="store_true", dest="verbose",  help="increase output verbosity" )
    parser.add_argument("-d", "--debug",    action="store_true", dest="debug",    help="show debug messages" )
    parser.add_argument("-h", "--host",     action="store",      dest="host",     help="Destination host" )
    parser.add_argument("-b", "--browser",  action="store",      dest="browser",  help="Browser driver.", choices=["Firefox", "Chrome", "IE", "Opera", "PhantomJS"] )
    parser.add_argument("-r", "--reports-dir", action="store",   dest="dir",      help="Directory to save screenshots.", default="reports")
    parser.add_argument('files', nargs='*')
    args = parser.parse_args()

    # Load files from the arguments.
    for filename in args.files:
        exec(open(filename).read())

    # See: http://codereview.stackexchange.com/q/88655/15346
    def make_suite(tc_class):
        testloader = unittest.TestLoader()
        testnames = testloader.getTestCaseNames(tc_class)
        suite = unittest.TestSuite()
        for name in testnames:
            suite.addTest(tc_class(name, cargs=args))
        return suite

    # Add all tests.
    alltests = unittest.TestSuite()
    for name, obj in inspect.getmembers(sys.modules[__name__]):
        if inspect.isclass(obj) and name.startswith("FooTest"):
            alltests.addTest(make_suite(obj))

    # Set-up logger
    verbose = bool(os.environ.get('VERBOSE', args.verbose))
    debug   = bool(os.environ.get('DEBUG', args.debug))
    if verbose or debug:
        logging.basicConfig( stream=sys.stdout )
        root = logging.getLogger()
        root.setLevel(logging.INFO if verbose else logging.DEBUG)
        ch = logging.StreamHandler(sys.stdout)
        ch.setLevel(logging.INFO if verbose else logging.DEBUG)
        ch.setFormatter(logging.Formatter('%(asctime)s %(levelname)s: %(name)s: %(message)s'))
        root.addHandler(ch)
    else:
        logging.basicConfig(stream=sys.stderr)

    # Run tests.
    result = unittest.TextTestRunner(verbosity=2).run(alltests)
    sys.exit(not result.wasSuccessful())

为了简单起见,请原谅我的非PEP8编码标准。

然后,您可以为所有测试的通用组件创建BaseTest类,因此每个测试都将看起来像:

from BaseTest import BaseTest
class FooTestPagesBasic(BaseTest):
    def test_foo(self):
        driver = self.driver
        driver.get(self.base_url + "/")

要运行,只需将测试指定为命令行参数的一部分,例如:

./run_tests.py -h http://example.com/ tests/**/*.py

Here is my approach by creating a wrapper to run tests from the command line:

#!/usr/bin/env python3
import os, sys, unittest, argparse, inspect, logging

if __name__ == '__main__':
    # Parse arguments.
    parser = argparse.ArgumentParser(add_help=False)
    parser.add_argument("-?", "--help",     action="help",                        help="show this help message and exit" )
    parser.add_argument("-v", "--verbose",  action="store_true", dest="verbose",  help="increase output verbosity" )
    parser.add_argument("-d", "--debug",    action="store_true", dest="debug",    help="show debug messages" )
    parser.add_argument("-h", "--host",     action="store",      dest="host",     help="Destination host" )
    parser.add_argument("-b", "--browser",  action="store",      dest="browser",  help="Browser driver.", choices=["Firefox", "Chrome", "IE", "Opera", "PhantomJS"] )
    parser.add_argument("-r", "--reports-dir", action="store",   dest="dir",      help="Directory to save screenshots.", default="reports")
    parser.add_argument('files', nargs='*')
    args = parser.parse_args()

    # Load files from the arguments.
    for filename in args.files:
        exec(open(filename).read())

    # See: http://codereview.stackexchange.com/q/88655/15346
    def make_suite(tc_class):
        testloader = unittest.TestLoader()
        testnames = testloader.getTestCaseNames(tc_class)
        suite = unittest.TestSuite()
        for name in testnames:
            suite.addTest(tc_class(name, cargs=args))
        return suite

    # Add all tests.
    alltests = unittest.TestSuite()
    for name, obj in inspect.getmembers(sys.modules[__name__]):
        if inspect.isclass(obj) and name.startswith("FooTest"):
            alltests.addTest(make_suite(obj))

    # Set-up logger
    verbose = bool(os.environ.get('VERBOSE', args.verbose))
    debug   = bool(os.environ.get('DEBUG', args.debug))
    if verbose or debug:
        logging.basicConfig( stream=sys.stdout )
        root = logging.getLogger()
        root.setLevel(logging.INFO if verbose else logging.DEBUG)
        ch = logging.StreamHandler(sys.stdout)
        ch.setLevel(logging.INFO if verbose else logging.DEBUG)
        ch.setFormatter(logging.Formatter('%(asctime)s %(levelname)s: %(name)s: %(message)s'))
        root.addHandler(ch)
    else:
        logging.basicConfig(stream=sys.stderr)

    # Run tests.
    result = unittest.TextTestRunner(verbosity=2).run(alltests)
    sys.exit(not result.wasSuccessful())

For sake of simplicity, please excuse my non-PEP8 coding standards.

Then you can create BaseTest class for common components for all your tests, so each of your test would simply look like:

from BaseTest import BaseTest
class FooTestPagesBasic(BaseTest):
    def test_foo(self):
        driver = self.driver
        driver.get(self.base_url + "/")

To run, you simply specifying tests as part of the command line arguments, e.g.:

./run_tests.py -h http://example.com/ tests/**/*.py