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Stop using method swizzling for registering CurrentTestCaseTracker to…
… XCTestObservationCenter The weird workaround is no longer needed in recent Xcode versions (at least Xcode 10.1 or later).
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Sources/NimbleObjectiveC/XCTestObservationCenter+Register.m
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#import <XCTest/XCTest.h> | ||
#import <objc/runtime.h> | ||
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#if __has_include("Nimble-Swift.h") | ||
#import "Nimble-Swift.h" | ||
#else | ||
#import <Nimble/Nimble-Swift.h> | ||
#endif | ||
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#pragma mark - Method Swizzling | ||
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/// Swaps the implementations between two instance methods. | ||
/// | ||
/// @param class The class containing `originalSelector`. | ||
/// @param originalSelector Original method to replace. | ||
/// @param replacementSelector Replacement method. | ||
void swizzleSelectors(Class class, SEL originalSelector, SEL replacementSelector) { | ||
Method originalMethod = class_getInstanceMethod(class, originalSelector); | ||
Method replacementMethod = class_getInstanceMethod(class, replacementSelector); | ||
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BOOL didAddMethod = | ||
class_addMethod(class, | ||
originalSelector, | ||
method_getImplementation(replacementMethod), | ||
method_getTypeEncoding(replacementMethod)); | ||
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if (didAddMethod) { | ||
class_replaceMethod(class, | ||
replacementSelector, | ||
method_getImplementation(originalMethod), | ||
method_getTypeEncoding(originalMethod)); | ||
} else { | ||
method_exchangeImplementations(originalMethod, replacementMethod); | ||
} | ||
} | ||
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#pragma mark - Private | ||
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@interface XCTestObservationCenter (Private) | ||
- (void)_addLegacyTestObserver:(id)observer; | ||
@end | ||
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@implementation XCTestObservationCenter (Register) | ||
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/// Uses objc method swizzling to register `CurrentTestCaseTracker` as a test observer. This is necessary | ||
/// because Xcode 7.3 introduced timing issues where if a custom `XCTestObservation` is registered too early | ||
/// it suppresses all console output (generated by `XCTestLog`), breaking any tools that depend on this output. | ||
/// This approach waits to register our custom test observer until XCTest adds its first "legacy" observer, | ||
/// falling back to registering after the first normal observer if this private method ever changes. | ||
+ (void)load { | ||
if (class_getInstanceMethod([self class], @selector(_addLegacyTestObserver:))) { | ||
// Swizzle -_addLegacyTestObserver: | ||
swizzleSelectors([self class], @selector(_addLegacyTestObserver:), @selector(NMB_original__addLegacyTestObserver:)); | ||
} else { | ||
// Swizzle -addTestObserver:, only if -_addLegacyTestObserver: is not implemented | ||
swizzleSelectors([self class], @selector(addTestObserver:), @selector(NMB_original_addTestObserver:)); | ||
} | ||
__attribute__((constructor)) | ||
static void registerCurrentTestCaseTracker() { | ||
[[XCTestObservationCenter sharedTestObservationCenter] addTestObserver:[CurrentTestCaseTracker sharedInstance]]; | ||
} | ||
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#pragma mark - Replacement Methods | ||
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/// Registers `CurrentTestCaseTracker` as a test observer after `XCTestLog` has been added. | ||
- (void)NMB_original__addLegacyTestObserver:(id)observer { | ||
[self NMB_original__addLegacyTestObserver:observer]; | ||
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static dispatch_once_t onceToken; | ||
dispatch_once(&onceToken, ^{ | ||
[self addTestObserver:[CurrentTestCaseTracker sharedInstance]]; | ||
}); | ||
} | ||
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/// Registers `CurrentTestCaseTracker` as a test observer after `XCTestLog` has been added. | ||
/// This method is only used if `-_addLegacyTestObserver:` is not impelemented. (added in Xcode 7.3) | ||
- (void)NMB_original_addTestObserver:(id<XCTestObservation>)observer { | ||
[self NMB_original_addTestObserver:observer]; | ||
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static dispatch_once_t onceToken; | ||
dispatch_once(&onceToken, ^{ | ||
[self NMB_original_addTestObserver:[CurrentTestCaseTracker sharedInstance]]; | ||
}); | ||
} | ||
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@end |