[TrimmableTypeMap] Trimmable typemap test exclusions inventory

[simonrozsival]

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.

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❌ Missing Java classes (5 tests)

Test(s)	Count	Missing Class	Error
JavaObjectTest.DisposeAccessesThis	1	net.dot.jni.test.GetThis	Cannot register native members
InvokeVirtualFromConstructorTests.*	3	net.dot.jni.test.CallVirtualFromConstructorDerived	NoClassDefFoundError
JniTypeManagerTests.CannotCreateGenericHolderFromJava	1	net.dot.jni.test.GenericHolder	Returns null instead of throwing NotSupportedException

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❌ JavaProxyObject / JavaProxyThrowable not available (24 tests)

Test(s)	Count	Error
JavaObjectArray_object_ContractTest.*	16	TestFixtureSetUp Failed — JavaProxyObject native member registration fails
JniValueMarshaler_object_ContractTests.* (Create*, SpecificTypesAreUsed)	7	NoClassDefFoundError: net.dot.jni.internal.JavaProxyObject
JavaExceptionTests.InnerExceptionIsNotAProxy	1	Proxy throwable creation fails

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❌ Proxy resolution / trimmer gaps (4 tests)

Test	Error
JniValueMarshaler_IJavaPeerable_ContractTests.*.CreateGenericValue	No JavaPeerProxy for java/lang/Object with IJavaPeerable target
JniValueMarshaler_IJavaPeerable_ContractTests.*.CreateValue	No JavaPeerProxy for java/lang/Object with IJavaPeerable target
JavaPeerableExtensionsTests.JavaAs	MissingMethodException — IJavaInterfaceInvoker ctor trimmed
JavaPeerableExtensionsTests.JavaAs_Exceptions	Wrong exception type (ClassNotFoundException vs ArgumentException)
JavaPeerableExtensionsTests.JavaAs_InstanceThatDoesNotImplementInterfaceReturnsNull	No JavaPeerProxy for IAndroidInterface

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❌ JavaCast proxy resolution (4 tests)

Test	Error
JavaObjectExtensionsTests.JavaCast_BadInterfaceCast	NotSupportedException instead of InvalidCastException
JavaObjectExtensionsTests.JavaCast_CheckForManagedSubclasses	NotSupportedException instead of InvalidCastException
JavaObjectExtensionsTests.JavaCast_InvalidTypeCastThrows	NotSupportedException instead of InvalidCastException
JavaObjectExtensionsTests.JavaCast_BaseToGenericWrapper	Cannot create instance of open generic type

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❌ Open generic types / registration (4 tests)

Test	Error
JnienvTest.NewOpenGenericTypeThrows	Open generic creation succeeds when it should throw NotSupportedException
JnienvTest.ActivatedDirectThrowableSubclassesShouldBeRegistered	Throwable subclass not registered (Expected: True, But was: False)
ObjectTest.GetObject_ReturnsMostDerivedType	Returns Java.Lang.Object instead of Java.Lang.String
ObjectTest.JnienvCreateInstance_RegistersMultipleInstances	Instance identity differs after JNI round-trip

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❌ JNI method remapping not supported (4 tests)

Test	Error
JniPeerMembersTests.ReplaceInstanceMethodName	NoSuchMethodError — remapped method not found
JniPeerMembersTests.ReplaceInstanceMethodWithStaticMethod	NoSuchMethodError
JniPeerMembersTests.ReplaceStaticMethodName	NoSuchMethodError
JniPeerMembersTests.ReplacementTypeUsedForMethodLookup	Returns wrong hash code

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❌ Other (3 tests)

Test	Error
JniTypeManagerTests.GetType	InvalidOperationException — no JniPrimitiveArrayInfo for JavaBooleanArray
CustomWidgetTests.InflateCustomView_ShouldNotLeakGlobalRefs	256 extra global refs after inflating/GC'ing 100 custom views

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✅ 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

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Summary Table

Root Cause	Count
Missing net.dot.jni.test.* Java classes	5
JavaProxyObject/JavaProxyThrowable not available	24
Proxy resolution / trimmer gaps	5
JavaCast proxy resolution	4
Open generic types / registration	4
JNI method remapping	4
Other	2
Total excluded	48
Previously excluded, now (re)enabled	45