Java's `Ice/translator` Tests are not Run (and are out of date)

[InsertCreativityHere]

These tests seem to be checking the java mapping, with an emphasis on the module->package mapping.

But, these tests are clearly never run. They aren't in the gradle file: https://github.com/zeroc-ice/ice/blob/main/java/test/slice.gradle

And the actual test files are littered with old Slice constructs: https://github.com/zeroc-ice/ice/blob/8f6f3e2c531fe078002a2d77b4d072df801d2471/java/test/Ice/translator/Underscore.ice#L12-L17 And classes implementing interfaces: https://github.com/zeroc-ice/ice/blob/8f6f3e2c531fe078002a2d77b4d072df801d2471/java/test/Ice/translator/SingleModuleWithPackage.ice#L43-L45 And other things that were removed a while ago.

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We should either:

1. Update these tests, and start actually running them, or
2. Remove them

[InsertCreativityHere]

Just for the record, when I try to compile these Slice files manually, they indeed generate a bunch of syntax errors.

[externl]

Should we also fix on 3.7?

[InsertCreativityHere]

Should we also fix on 3.7?

I don't see why not.

[pepone]

I believe these were compile-only tests. We should test these using our standard tests, which we compile and execute.

For example Underscore.ice was there to ensure that you can use underscores in identifiers, most of the rest seems related to module/package mapping.

[InsertCreativityHere]

Ah, it'd make sense if they weren't pulling along into the new testing system then.

Seems like the consensus is that we should keep these tests, update/remove their old Slice definitions, and add them back into the gradle testing? Even if only as a compile-test.