Failing MinitestTests in JUnit Harness

[smarr]

The MinittestTests fail with a MessageNotUnderstood Exception not being properly caught. The main issue is that the harness reinitializes the Kernel object, but reuses existing ASTs. The AST do value caching, for instance for the outer object, which is used to access class slots. The profile holds on to the old Kernel, and thus also to the old Exception object, which then in turn does not compare identical with the new Exception object.