Missing annotations on test files

[rafaelmenta]

Some test files are missing @RunWith annotations

Environment details

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Steps to reproduce

• oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java
• oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java
• oauth2_http/javatests/com/google/auth/oauth2/JwtCredentialsTest.java
• oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java

Stacktrace

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Code snippet

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External references such as API reference guides used

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Any additional information below

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