[TrimmableTypeMap] Trimmable typemap test exclusions inventory #11170

Summary

The trimmable typemap (_AndroidTypeMapImplementation=trimmable) has 48 tests that are currently excluded because they fail due to fundamental trimmable-typemap limitations. They are excluded by exact name in NUnitInstrumentation.cs, guarded by RuntimeFeature.TrimmableTypeMap, so they only apply to trimmable builds.

The goal is to fix these one by one and remove each exclusion as it's resolved.

All failures share common root causes: the trimmable typemap does not generate Java-side classes for types in Java.Interop-Tests that use JavaObject (not Java.Lang.Object) or rely on net.dot.jni.test.* / net.dot.jni.internal.* Java classes, and some runtime behaviors differ (wrong exception types, missing proxy resolution, etc.).

How to reproduce

make prepare && make all CONFIGURATION=Release
./dotnet-local.sh build tests/Mono.Android-Tests/Mono.Android-Tests/Mono.Android.NET-Tests.csproj \
    -t:RunTestApp -c Release \
    -p:_AndroidTypeMapImplementation=trimmable \
    -p:UseMonoRuntime=false

Results: 859 passed, 48 excluded, 10 ignored (by NativeTypeMap/Export/CoreCLRIgnore/NTLM — not trimmable-specific).

To see the raw failures, temporarily remove the ExcludedTestNames block from NUnitInstrumentation.cs.

❌ Missing Java classes (5 tests)

❌ JavaProxyObject / JavaProxyThrowable not available (24 tests)

❌ Proxy resolution / trimmer gaps (4 tests)

❌ JavaCast proxy resolution (4 tests)

❌ Open generic types / registration (4 tests)

❌ JNI method remapping not supported (4 tests)

❌ Other (3 tests)

✅ Previously excluded, now (re)enabled (45 tests)

As of PR #11091, all over-broad exclusions were replaced with precise per-test exclusions. 45 tests that were previously silently excluded now run and pass:

• GetObjectArray (was CoreCLRIgnore)
• 3 NTLM negotiate auth tests (were NTLM category)
• JavaExceptionTests.InnerException, StackTrace
• JavaObjectExtensionsTests.JavaAs
• 11 JavaObjectTest tests (Ctor, Dispose, GC, registration, etc.)
• JavaPeerableExtensionsTests.JavaAs_NullSelfReturnsNull
• 4 JniPeerMembersTests tests (Ctor, desugaring, fallback lookup, virtual invoke)
• 3 JniTypeManagerTests tests (CanCreateGenericHolder, GetTypeSignature×2)
• 16 JniValueMarshaler_IJavaPeerable_ContractTests tests
• 3 JniValueMarshaler_object_ContractTests tests
• 3 CustomWidgetTests inflate tests

Summary Table