CustomTestLog.m

## CustomTestLog.m
//
//  CustomTestLog.m
//
//  Created by Neil on 24/04/2014.
//

#import <XCTest/XCTest.h>

@interface CustomTestLog : XCTestObserver

@property (nonatomic, strong) NSFileHandle *logFileHandle;

@end

@implementation CustomTestLog

+ (void)load
{
    [[NSUserDefaults standardUserDefaults] setValue:NSStringFromClass(self) forKey:XCTestObserverClassKey];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

- (void)startObserving
{
    [super startObserving];

    self.logFileHandle = [NSFileHandle fileHandleWithStandardError];
}

- (void)stopObserving
{
    [[NSUserDefaults standardUserDefaults] setValue:NSStringFromClass(self.superclass) forKey:XCTestObserverClassKey];
    [[NSUserDefaults standardUserDefaults] synchronize];

    [self.logFileHandle closeFile];
    [super stopObserving];
}
- (void) testSuiteDidStart:(XCTestRun *) testRun
{
    [self log:@"Test Suite '%@' started at %@\n", testRun.test.name, [NSDate date]];
}

- (void) testSuiteDidStop:(XCTestRun *) testRun
{
    [self log:@"Test Suite '%@' finished at %@.\nExecuted %d tests, with %d failure (%d unexpected) in %.3f (%.3f) seconds\n",
        testRun.test.name, [NSDate date], testRun.testCaseCount, testRun.totalFailureCount, testRun.unexpectedExceptionCount,
        testRun.testDuration, testRun.totalDuration];
}

- (void) testCaseDidStart:(XCTestRun *) testRun
{
    [self log:@"Test Case '%@' started.\n", testRun.test.name];
}

- (void) testCaseDidStop:(XCTestRun *) testRun
{
    [self log:@"Test Case '%@' %@ (%.3f seconds).\n", testRun.test.name,
                                              testRun.hasSucceeded ? @"passed" : @"failed",
                                              testRun.testDuration];
}

- (void) testCaseDidFail:(XCTestRun *)testRun
         withDescription:(NSString *)description
                  inFile:(NSString *)filePath
                  atLine:(NSUInteger)lineNumber
{
    [self log:@"%@:%d: error: %@ : %@\n", filePath, lineNumber, testRun.test.name, description];

}

- (void)log:(NSString *)format, ...
{
    va_list args;
    va_start(args, format);

    NSString *formattedString = [[NSString alloc] initWithFormat:format arguments:args];
    [self.logFileHandle writeData:[formattedString dataUsingEncoding:NSUTF8StringEncoding]];

    va_end(args);
}

@end

## FailingTestLog.m
//
//  FailingTestLog.m
//
//  Created by Neil on 24/04/2014.
//

#import <XCTest/XCTest.h>

@interface FailingTestLog : XCTestObserver

@property (nonatomic, strong) NSFileHandle *logFileHandle;

@end

@implementation FailingTestLog

+ (void)load
{
    [[NSUserDefaults standardUserDefaults] setValue:NSStringFromClass(self) forKey:XCTestObserverClassKey];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

- (void)startObserving
{
    [super startObserving];

    self.logFileHandle = [NSFileHandle fileHandleWithStandardError];
}

- (void)stopObserving
{
    [[NSUserDefaults standardUserDefaults] setValue:NSStringFromClass(self.superclass) forKey:XCTestObserverClassKey];
    [[NSUserDefaults standardUserDefaults] synchronize];

    [self.logFileHandle closeFile];
    [super stopObserving];
}

- (void)testCaseDidStop:(XCTestRun *) testRun
{
    [self log:@"Test Case '%@' %@ (%.3f seconds).\n", testRun.test.name,
                                              testRun.hasSucceeded ? @"passed" : @"failed",
                                              testRun.testDuration];
}

- (void)testCaseDidFail:(XCTestRun *)testRun
         withDescription:(NSString *)description
                  inFile:(NSString *)filePath
                  atLine:(NSUInteger)lineNumber
{
    [self log:@"%@:%d: error: %@ : %@\n", filePath, lineNumber, testRun.test.name, description];
}

- (void)log:(NSString *)format, ...
{
    va_list args;
    va_start(args, format);

    NSString *formattedString = [[NSString alloc] initWithFormat:format arguments:args];
    [self.logFileHandle writeData:[formattedString dataUsingEncoding:NSUTF8StringEncoding]];

    va_end(args);
}

@end