Keychain APIs fail in unhosted unit tests on Xcode 9, don't under 8

Originator:apontious
Number:rdar://34838798 Date Originated:10/5/2017
Status:Open Resolved:
Product:Developer Tools Product Version:9.0
Classification:Bug Reproducible:Always
 
Summary:
The same Keychain API calls fail when run in the Simulator in Xcode 9 in unhosted unit tests, but succeed in hosted unit tests, and they succeed in both cases on Xcode 8.

Steps to Reproduce:
- Install both Xcode 8.3.3 and Xcode 9.0.
- Clone repository from https://github.com/apontious/Secrets.
- Download and install iOS 9.0, 9.2, 10.0, and 10.2 SDKs.
- Open Xcode 8.3.3.
- Open Secrets project and test (Cmd-U) on all downloaded SDK versions. All tests succeed on all SDK versions.
- Close Xcode 8.3.3 and the 8.3.3 Simulator.
- Open Xcode 9.
- Open Secrets project and test (Cmd-U) on all downloaded SDK versions, and on the iOS 11 SDK included with Xcode 9.

Expected Results:
- All tests succeed on all SDK versions.

Actual Results:
- Despite being exactly the same test running on exactly the same downloaded Simulators, only the tests on the iOS 9.* SDKs and the hosted tests on iOS 10 and 11 SDKs succeed under Xcode 9.

Under Xcode 9, the iOS 10.* SDKs with the unhosted tests fail with the error -34018 ("A required entitlement isn't present").

Under Xcode 9, the iOS 11 SDK with the unhosted tests fail with the error -50 ("One or more parameters passed to a function were not valid").

Version/Build:
Xcode 9.0 with iOS 9.*, 10.*, and 11 SDKs.

Configuration:
macOS Sierra 10.12.6

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