Stack trace with failed assertion due to calling `-[XCTestCase measureBlock]` inside a spec.

measureBlockFailure.txt

2015-04-12 18:01:37.224 xctest[36363:1321742] *** Assertion failure in -[HomeFriesTests.AppleHashSpec measureMetrics:automaticallyStartMeasuring:forBlock:], /SourceCache/XCTest_Sim/XCTest-7503/XCTestFramework/Classes/XCTestCase.m:1022
<unknown>:0: error: -[HomeFriesTests.AppleHashSpec a_hashable_person__should_have_a_performant_hash_function] : failed: caught "NSInternalInconsistencyException", "-numberOfTestIterationsForTestWithSelector: returned 0 for -[HomeFriesTests.AppleHashSpec (null)]. -numberOfTestIterationsForTestWithSelector: must return 1 for tests that call -measure...Block: APIs."
(
	0   CoreFoundation                      0x000000010c124c65 __exceptionPreprocess + 165
	1   libobjc.A.dylib                     0x000000010bdbdbb7 objc_exception_throw + 45
	2   CoreFoundation                      0x000000010c124aca +[NSException raise:format:arguments:] + 106
	3   Foundation                          0x000000010b9d298f -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
	4   XCTest                              0x000000010f9a41a0 -[XCTestCase measureMetrics:automaticallyStartMeasuring:forBlock:] + 1481
	5   HomeFriesTests                      0x000000010d983411 _TFFZFC14HomeFriesTests22SharedHashableExamples9configureFMS0_FGSQC5Quick13Configuration_T_U0_FFT_CSo12NSDictionaryT_U2_FT_T_ + 449
	6   Quick                               0x000000010fb4da86 _TFC5Quick7Example3runfS0_FT_T_ + 710
	7   Quick                               0x000000010fb4df14 _TToFC5Quick7Example3runfS0_FT_T_ + 36
	8   Quick                               0x000000010fb46f9b __41+[QuickSpec addInstanceMethodForExample:]_block_invoke + 75
	9   CoreFoundation                      0x000000010c01adec __invoking___ + 140
	10  CoreFoundation                      0x000000010c01ac42 -[NSInvocation invoke] + 290
	11  XCTest                              0x000000010f9a212a -[XCTestCase invokeTest] + 253
	12  XCTest                              0x000000010f9a232b -[XCTestCase performTest:] + 150
	13  XCTest                              0x000000010f9abbe5 -[XCTest run] + 260
	14  XCTest                              0x000000010f9a103b -[XCTestSuite performTest:] + 379
	15  XCTest                              0x000000010f9abbe5 -[XCTest run] + 260
	16  XCTest                              0x000000010f9a103b -[XCTestSuite performTest:] + 379
	17  XCTest                              0x000000010f9abbe5 -[XCTest run] + 260
	18  XCTest                              0x000000010f9a103b -[XCTestSuite performTest:] + 379
	19  XCTest                              0x000000010f9abbe5 -[XCTest run] + 260
	20  XCTest                              0x000000010f99e0d9 __25-[XCTestDriver _runSuite]_block_invoke + 56
	21  XCTest                              0x000000010f9a8e8d -[XCTestObservationCenter _observeTestExecutionForBlock:] + 162
	22  XCTest                              0x000000010f99e010 -[XCTestDriver _runSuite] + 269
	23  XCTest                              0x000000010f99ea3d -[XCTestDriver _checkForTestManager] + 234
	24  XCTest                              0x000000010f9aead0 +[XCTestProbe runTests:] + 182
	25  xctest                              0x000000010b8a31a6 xctest + 4518
	26  xctest                              0x000000010b8a3419 xctest + 5145
	27  xctest                              0x000000010b8a2e23 xctest + 3619
	28  libdyld.dylib                       0x000000010d3f0145 start + 1
	29  ???                                 0x000000000000000c 0x0 + 12
)
Test Case '-[HomeFriesTests.AppleHashSpec a_hashable_person__should_have_a_performant_hash_function]' failed (6.027 seconds).