从Nose2插件跳过单元测试
我在使用Nose2插件时遇到了一些麻烦，想要跳过一个单元测试。虽然我可以把测试标记为跳过，并且在最后的结果中看到原因，但测试还是会执行。下面的示例代码应该可以在插件激活的情况下跳过任何测试。
from nose2.events import Plugin
class SkipAllTests(Plugin):
def startTest(self, event):
event.result.addSkip(event.test, 'skip it')
event.handled = True
如果我调用 event.test.skipTest('reason')，它确实会像预期那样抛出一个 SkipTest 异常，但这个异常并没有被测试运行器捕获，而是在我的 startTest 钩子方法里抛出。有没有什么好的建议呢？
2 个回答
0
我遇到了同样的问题……我解决这个问题的方法是：
class SkipMe :
"""
Use this module together with nose2 and preferably with the 'with such.A() ...' construct.
Synopsis :
import nose2.tools.such as such
import inspect
import functools
import unittest
with such.A( 'thingy') as it : # Create a SkipMe object.
skipme = SkipMe( 'my_id' ) # You can give this section/chapter a name
skipme = SkipMe() # or just leave it as 'Default'.
@it.has_setup # Integrate to test setup to skip all tests if you like.
def setup() :
skipme.skip_all() # To skip every test in here.
skipme.skip_all( 'for some reason' ) # Same but give a reason in verbose mode.
...
@it.has_test_setup # Recommended to integrate into setup for every test.
def test_setup() :
skipme.skip_if_reason() # Skip test if an overall skip reason was set.
...
@it.should( "just be skipped" )
@skipme.skip_reg( reason='I want it that way' ) # Intentionally skip a single test
def test_skipping():
...
@it.should( "do something basic")
@skipme.skip_reg( skip_all_on_failed=True ) # Register this test. If it fails, skip all consecutive tests.
def test_basic_things() :
...
@it.should( "test something")
@skipme.skip_reg() # Register this test. It will be marked as passed or failed.
def test_one_thing() :
...
@it.should( "test another thing") # Skip this test if previous 'test_one_thing' test failed.
@skipme.skip_reg( func_list=['test_one_thing'] )
def test_another_thing() : # 'skipme.helper' is a unittest.TestCase object.
skipme.helper.assertIs( onething, otherthing, 'MESSAGE' )
...
it.createTests( globals() )
Purpose : Have a convenient way of skipping tests in a nose2 'whith such.A() ...' construct.
As a bonus you have with the 'object.helper' method a 'unittest.TestCase' object.
You can use it to have all the fine assert functions at hand, like assertRaisesRegexp.
Initialize object with:
:param chapter : A string as identifier for a chapter/section.
Defaults:
chapter : 'Default'
Prerequisites: import nose2.tools.such as such, unittest, inspect, functools
Description:
Basically this class has an internal dict that sets and browses for values.
The dict looks like:
{
'IDENTIFYER_1' : { # This is the value of 'chapter'.
'__skip_all__' : BOOLEAN|FUNC_NAME, # Skip all consecutive tests if this is True or a string.
'func1' : BOOLEAN, # Register functions as True (passed) or False (failed).
'func2' : BOOLEAN, # Also skipped tests are marked as failed.
...
},
'IDENTIFYER_1' : { ... }, # This is the domain of another SkipMe object with
... # a different value for 'chapter'
}
It provides a decorator 'object.skip_reg' to decorate test functions to register them to the class,
meaning updating the internal dict accordingly.
Skipped tests are marked as failed in this context.
Skipping all tests of a 'with such.A()' construct:
Integrate it into the setup and the test setup like so:
with such.A( 'thingy') as it :
skipme = SkipMe()
@it.has_setup
def setup() :
skipme.skip_all()
@it.has_test_setup
def test_setup() :
skipme.skip_if_reason()
If you intend to skip all tests or all consecutive tests after a special test failed,
you need only the '@it.has_test_setup' part.
Register tests with the 'skip_reg' method:
Decorate the test functions with the 'object.skip_reg' method under the @it.should decorator.
Example:
with such.A( 'thingy') as it :
skipme = SkipMe()
# Same setup as above
...
@it.should( "Do something")
@skipme.skip_reg() # Just register this function.
@skipme.skip_reg( reason='SOME REASON' ) # Skip this test.
@skipme.skip_reg( func_list=[TEST_FUNCTION_NAMES] ) # Skip test if one function in the list failed.
@skipme.skip_reg( skip_all_on_failed=True ) # Skip all consecutive tests if this fails.
@skipme.skip_reg( func_list=[LIST_OF_TEST_FUNCTIONS], skip_all_on_failed=True ) # Or both.
Example:
import nose2.tools.such as such
import inspect
import functools
import unittest
with such.A( 'thingy' ) as it :
skipme = SkipMe()
@it.has_test_setup
def test_setup() :
skipme.skip_if_reason()
@it.should( "Do something" )
@skipme.skip_reg()
def test_one():
raise
@it.should( "Do another thing" )
@skipme.skip_reg( func_list=[ 'test_one' ] )
def test_two():
pass
@it.should( "just skip" )
@skipme.skip_reg( reason='I want it that way' )
def test_three():
pass
it.createTests( globals() )
# Then run:
nose2 --layer-reporter --plugin=nose2.plugins.layers -v
# Prints:
A thingy
should Do something ... ERROR
should Do another thing ... skipped because of failed: 'test_one'
should just skip ... skipped intentionally because: 'I want it that way'
...
"""
chapter_of = {}
def __init__( self, chapter=None ) :
"""
Initialize a SkipMe object.
:param chapter: If set, must be a string, else it's 'Default'.
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if chapter is None :
chapter = 'Default' # Set default chapter for convenience
if not isinstance( chapter, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'chapter': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( chapter ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
self.chapter = chapter
self.helper = self.SkipMeHelper() # Set unittest.TestCase object as helper
@classmethod
def set_chapter( cls, chapter=None, func=None, value=None ):
"""
Mark a function of a chapter as passed (True) or failed (False) in class variable 'chapter_of'.
Expands 'chapter_of' by chapter name, function and passed/failed value.
:param chapter: Chapter the function belongs to
:param func: Function name
:param value: Boolean
:return: None
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if chapter is None :
chapter = 'Default' # Set default chapter for convenience
if not isinstance( chapter, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'chapter': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( chapter ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
if func is None :
raise ValueError( "{0} {1}.{2}: No input for 'func'".format( "ERROR", 'SkipMe', func_name ) )
if not isinstance( func, str ) :
wrong_type = type( func )
raise ValueError( "{0} {1}.{2}: Invalid input for 'func': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( func ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
if not isinstance( value, bool ) :
raise ValueError( "{0} {1}.{2}: No or invalid input for 'value'".format( "ERROR", 'SkipMe', func_name ) )
if chapter not in cls.chapter_of : # If we have this chapter not yet,
cls.chapter_of[ chapter ] = {} # add it and set skip all to false.
cls.chapter_of[ chapter ][ '__skip_all__' ] = False
if func not in cls.chapter_of[ chapter ] : # If we don't have the function yet, add it with value.
cls.chapter_of[ chapter ][ func ] = value
@classmethod
def get_func_state( cls, chapter=None, func_list=None ):
"""
Return function names out of function list that previously failed
:param chapter: The chapter to search for functions
:param func_list: Browse for these function names
:return: List with failed functions. If none found, an empty list.
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if chapter is None :
chapter = 'Default' # Set default chapter for convenience
if not isinstance( chapter, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'chapter': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( chapter ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
if func_list is None :
raise ValueError( "{0} {1}.{2}: No input for 'func_list'".format( "ERROR", 'SkipMe', func_name ) )
#-------------------------
# Function candidates to check.
# Collect those candidates, that previously returned as failed or skipped.
# Otherwise, return empty list.
if isinstance( func_list, list ) :
func_candidates = func_list
elif isinstance( func_list, str ) :
func_candidates = [ x.strip() for x in func_list.split( ',' ) ]
else:
wrong_type = type( func_list )
raise ValueError( "{0} {1}: Invalid input for 'func_list': '{2}'\n"
.format( "ERROR", func_name, str( func_list ) )
+ "{0} Must be list or comma separated string, but was: '{1}'"
.format( "INFO", wrong_type.__name__ ) )
to_return = [] # List of failed functions
if chapter not in cls.chapter_of : # If chapter not found, just return empty list
return to_return
for func in func_candidates : # Otherwise look for each candidate
if func not in cls.chapter_of[ chapter ] : # if it's in the chapter, skip if not.
continue
if not cls.chapter_of[ chapter ][ func ] : # If it's value is False, append it.
to_return.append( func )
return to_return
@classmethod
def mark_chapter_as_skipped( cls, chapter=None, func=None ):
"""
Mark chapter as skipped. Maybe because of a failed function
:param chapter: Which chapter to mark as skipped
:param func: Maybe the failed function that causes this decision
:return: None
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if chapter is None :
chapter = 'Default' # Set default chapter for convenience
if not isinstance( chapter, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'chapter': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( chapter ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
# Either func is a name or True.
if func :
if not isinstance( func, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'func': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( func ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
else :
func = True
if chapter not in cls.chapter_of : # If we have this chapter not yet,
cls.chapter_of[ chapter ] = {} # add it and set skip all to false.
cls.chapter_of[ chapter ][ '__skip_all__' ] = func
@classmethod
def chapter_marked_skipped( cls, chapter=None ):
"""
Check if a chapter is marked to skip.
:param chapter: The chapter to check
:return: False : Chapter is not marked to be skipped
True : Chapter was intentionally skipped
String : This function was marked with 'skip_all_on_failed=True' and failed.
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if chapter is None :
chapter = 'Default' # Set default chapter for convenience
if not isinstance( chapter, str ) :
wrong_type = type( chapter )
raise ValueError( "{0} {1}.{2}: Invalid input for 'chapter': '{3}'\n"
.format( "ERROR", 'SkipMe', func_name, str( chapter ) )
+ "{0} Must be string, but was: {1}".format( "INFO", wrong_type.__name__ ) )
to_return = False
if chapter not in cls.chapter_of :
return to_return
to_return = cls.chapter_of[ chapter ].get( '__skip_all__', False )
return to_return
def skip_reg( self, func_list=None, skip_all_on_failed=None, reason=None ) :
"""
Synopsis :
skipme = SkipMe( 'my_id' )
@skipme.skip_reg()
def some_test_func() :
...
@skipme.skip_reg( func_list=[ LIST_OF_FUNCTIONS_TO_SKIP_IF_FAILED ], skip_all_on_failed=BOOLEAN,
reason=REASON )
def some_other_test_func():
...
Purpose : Decorator to register functions in a SkipMe object and skip tests if necessary
Incoming values :
:param func_list : List or comma separated string with function names.
Skip this test if one of these functions in the list failed or were skipped.
:param chapter : Identifier string that can be used to control skipping more generally.
Default name for chapter is 'Default'.
:param reason : Skip this test in any case and set a string for the reason.
:param skip_all_on_failed : Boolean. If this test fails, mark the current chapter
to skip the rest of tests.
Outgoing results :
:return : Updated class attribute 'chapter_of', maybe skipped test.
Defaults :
chapter : 'Default'
Prerequisites :
inspect, mars.colors.mcp
Description:
Register functions by decorating the functions.
It returns a dict with the function name as key and the function
reference as value.
"""
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
chapter = self.chapter
if isinstance( func_list, list ) :
func_candidates = func_list
elif isinstance( func_list, str ) :
func_candidates = [ x.strip() for x in func_list.split( ',' ) ]
elif func_list is None:
func_candidates = []
else :
wrong_type = type( func_list )
raise ValueError( "{0} {1}: Invalid input for 'func_list': '{2}'\n"
.format( "ERROR", func_name, str( func_list ) )
+ "{0} Must be list or comma separated string, but was: '{1}'"
.format( "INFO", wrong_type.__name__ ) )
if reason and not isinstance( reason, str ) :
wrong_type = type( func_list )
raise ValueError( "{0} {1}: Invalid input for 'reason': '{2}'\n"
.format( "ERROR", func_name, str( reason ) )
+ "{0} Must be string, but was: '{1}'"
.format( "INFO", wrong_type.__name__ ) )
def inner_skip_reg( func ) :
@functools.wraps( func )
def skip_reg_wrapper( *args, **kwargs ) :
#-------------------------
# First check if the whole chapter was marked as skipped.
# The function either returns:
# True : Means 'skip_all' was set in the beginning (e.g. with @has_setup)
# False : No, chapter is not marked as to be skipped
# Function name : This function was marked with 'skip_all_on_failed' and failed.
skip_reason = self.get_skip_reason()
if skip_reason :
if isinstance( skip_reason, bool ) :
self.helper.skipTest( "chapter '{0}' because it's marked to be skipped".format( chapter ) )
else :
self.helper.skipTest( "chapter '{0}' because of: '{1}'"
.format( chapter, skip_reason ) )
#-------------------------
# Then check if we are just intended to skip by a reason. If so, mark and skip
if reason :
self.__class__.set_chapter( chapter=chapter, func=func.__name__, value=False )
self.helper.skipTest( "intentionally because: '{0}'".format( reason ) )
#-------------------------
# Now see if one of our functions we depend on failed.
# If so, mark our func as failed and skip it.
if func_candidates :
found_failed = self.__class__.get_func_state( chapter=chapter, func_list=func_candidates )
if found_failed :
self.__class__.set_chapter( chapter=chapter, func=func.__name__, value=False )
self.helper.skipTest( "because of failed: '{0}'".format( ', '.join( found_failed ) ) )
#-------------------------
# Now run the test.
# If it fails (assertion error), mark as failed (False), else mark as passed (True)
# If it fails and was marked as 'skip_all_on_failed', mark chapter as to skip all further tests.
try :
result = func( *args, **kwargs )
self.__class__.set_chapter( chapter=chapter, func=func.__name__, value=True )
except Exception as error :
self.__class__.set_chapter( chapter=chapter, func=func.__name__, value=False )
if skip_all_on_failed :
self.__class__.mark_chapter_as_skipped( chapter=chapter, func=func.__name__ )
if error :
raise error
else :
raise
return result
return skip_reg_wrapper
return inner_skip_reg
def get_skip_reason( self ):
chapter = self.chapter
skip_reason = self.__class__.chapter_marked_skipped( chapter=chapter )
return skip_reason
def skip_all( self, reason=None ):
func_name = inspect.stack()[ 0 ][ 3 ] # This function Name
if reason is not None :
if not isinstance( reason, str ) :
wrong_type = type( reason )
raise ValueError( "{0} {1}: Invalid input for 'reason': '{2}'\n"
.format( "ERROR", func_name, str( reason ) )
+ "{0} Must be string, but was: '{1}'".format( "INFO", wrong_type.__name__ ) )
self.__class__.mark_chapter_as_skipped(chapter=self.chapter, func=reason )
def skip_if_reason( self ):
skip_reason = self.get_skip_reason()
if skip_reason:
if skip_reason is True :
reason = "it's marked to be skipped."
else : # Either function or other text.
if skip_reason in self.__class__.chapter_of[ self.chapter ].keys() :
reason = "'{0}' failed.".format( skip_reason )
else :
reason = "'{0}'.".format( skip_reason )
self.helper.skipTest( "chapter '{0}' because: {1}".format( self.chapter, reason ) )
class SkipMeHelper( unittest.TestCase ):
def runTest(self):
pass
SkipMeHelper.maxDiff = None # No limitation in depth while comparing
2
我觉得你不能通过 startTest 这个钩子来阻止测试运行。nose2 的文档 建议使用 matchPath 或者 getTestCaseNames 来实现这个功能。下面是一个使用 matchPath 的示例：
from nose2.events import Plugin
class SkipAllTests(Plugin):
configSection = "skipper"
commandLineSwitch = (None, 'skipper', "Skip all tests")
def matchPath(self, event):
event.handled = True
return False
matchPath 的文档其实明确说明了它是如何用来阻止测试运行的：
插件可以使用这个钩子来防止 Python 模块被测试加载器加载，或者强制它们被加载。将 event.handled 设置为 True 并返回 False，可以让加载器跳过这个模块。
使用这种方法会让测试用例根本不被加载。如果你想让测试在列表中显示为跳过，而不是根本不显示在测试列表中，你可以用 StartTestEvent 做一些小技巧：
def dummy(*args, **kwargs):
pass
class SkipAllTests(Plugin):
configSection = "skipper"
commandLineSwitch = (None, 'skipper', "Skip all tests")
def startTest(self, event):
event.test._testFunc = dummy
event.result.addSkip(event.test, 'skip it')
event.handled = True
在这里，我们用一个什么都不做的虚拟函数替换掉测试要运行的实际函数。这样，当测试执行时，它就什么都不做，然后报告说它被跳过了。