[swift-corelibs-dev] Build failure and differences between test and build

[Tony Parker]

> On Jun 21, 2017, at 6:30 AM, Alex Blewitt via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> 
> We had a test failure on swift-corelibs-foundation recently on master, which was related to this pull request being merged by me:
> 
> https://github.com/apple/swift-corelibs-foundation/pull/1043 <https://github.com/apple/swift-corelibs-foundation/pull/1043>
> 
> The automated tests passed, but after being committed to master, they then failed. I subsequently rolled them back with this pull request:
> 
> https://github.com/apple/swift-corelibs-foundation/pull/1056 <https://github.com/apple/swift-corelibs-foundation/pull/1056>
> 
> A few interim builds have failed; if you see messages like failing to compare metric and imperial measurements, that could have been caused by this. Rebasing and redoing such test failures should fix the issues.
> 
> It's a bit concerning that the test case failed after merge but passed in the pull request test. Is this expected?

I’m not 100% sure that our test cases are being run against a clean build, which has been the root of some confusion like this in the past.

- Tony

> 
> Alex
> Test Case 'TestNSLengthFormatter.test_stringFromMetersMetric' started at 2017-06-21 10:16:31.688
> TestFoundation/TestNSLengthFormatter.swift:71: error: TestNSLengthFormatter.test_stringFromMetersMetric : XCTAssertEqual failed: ("-6.214 mi") is not equal to ("-10 km") - 
> TestFoundation/TestNSLengthFormatter.swift:72: error: TestNSLengthFormatter.test_stringFromMetersMetric : XCTAssertEqual failed: ("-0.001 mi") is not equal to ("-0.001 km") - 
> TestFoundation/TestNSLengthFormatter.swift:73: error: TestNSLengthFormatter.test_stringFromMetersMetric : XCTAssertEqual failed: ("0 in") is not equal to ("0.01 mm") - 
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