Open Radar

 
Summary:
In some projects, -[XCTestCase expectationWithDescription:] takes over 70 seconds to create an XCTestCaseExpectation instance.

The following test case file reproduces the problem:

```
#import <XCTest/XCTest.h>

@interface LoweredExpectationsTests : XCTestCase
@end

@implementation LoweredExpectationsTests

- (void)testExample {
  XCTestExpectation *expectation = [self expectationWithDescription:@"some random expectation"];
  [expectation fulfill];
  [self waitForExpectationsWithTimeout:1.0 handler:nil];
}

@end
```

This test case, when run on a new Xcode project with very little code in it, executes in around 0.007 seconds. However, in a large project, the same test case takes upwards of 70 seconds--76.767 seconds, to be exact.

Because the project that consistently reproduces this error is proprietary, I cannot send a sample project. I have, however attached a sysdiagnose report. To product the report, I:

1. Ran sysdiagnose, passing the pid of Xcode.
2. While that was running, I ran the unit tests in Xcode for the project that reproduces the issue.
3. Waited until sysdiagnose completed.

Please let me know if there's a better way to report information on this error.

To diagnose, I paused execution of the test using the debugger while it was taking 70+ seconds to execute -[XCTestCase expectationWithDescription:]. I've attached a text file containing the stack trace (also available online at https://gist.github.com/modocache/da56bff7703682f6311d). My theory is that my library contains a lot of code, and CoreSymbolication is having a hard time symbolicating. I'm not sure why symbolication is occurring.

Steps to Reproduce:
1. Add the following test case to a large codebase:

```
#import <XCTest/XCTest.h>

@interface LoweredExpectationsTests : XCTestCase
@end

@implementation LoweredExpectationsTests

- (void)testExample {
  XCTestExpectation *expectation = [self expectationWithDescription:@"some random expectation"];
  [expectation fulfill];
  [self waitForExpectationsWithTimeout:1.0 handler:nil];
}

@end
```

2. Run the test case.

Expected Results:
The test case executes and passes immediately.

Actual Results:
The test case takes a very long time to run, in my case over 70 seconds.

Version:
Version 6.3 (6D570), OS X 10.10.2 (14C1514)

Notes:


Configuration:


Attachments:
'sysdiagnose_2015.04.16_14-30-14-0400_37345.tar.gz' and 'xctestcase-stack-trace.txt' were successfully uploaded.