[SUREFIRE-1991] Unit tests for JUnitPlatformProviderInfo#getProviderClasspath

**[Slawomir Jaranowski](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=slawekjaranowski)** opened **[SUREFIRE-1991](https://issues.apache.org/jira/browse/SUREFIRE-1991?redirect=false)** and commented

Unit tests should cover cases from documentation:
https://maven.apache.org/surefire/maven-surefire-plugin/examples/junit-platform.html

Additionally we can investigate that some IT tests can be removed if functionality will be covered by unit tests.

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No further details from [SUREFIRE-1991](https://issues.apache.org/jira/browse/SUREFIRE-1991?redirect=false)

Locate JUnitPlatformProviderInfo#getProviderClasspath and read the JUnit Platform documentation linked in the issue to identify the cases that need coverage. Add unit tests for those documented cases, then compare existing integration tests to determine whether any are fully covered and can be removed.

Written by the indexing model from the issue text.