[TrimmableTypeMap] Trimmable typemap test exclusions inventory

[simonrozsival]

Summary

The trimmable typemap (_AndroidTypeMapImplementation=trimmable) excludes several tests that fail under this configuration. Tests in our code use [Category("TrimmableIgnore")] and are excluded via ExcludeCategories in the .csproj. Tests from the external Java.Interop-Tests assembly are excluded by name in NUnitInstrumentation.cs.

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

To see the failures, temporarily clear ExcludedTestNames in NUnitInstrumentation.cs and remove TrimmableIgnore from the ExcludeCategories in the .csproj.

---

❌ Tests excluded via [Category("TrimmableIgnore")] (in our code)

Test	File	Error
ObjectTest.GetObject_ReturnsMostDerivedType	Java.Lang/ObjectTest.cs	Returns Java.Lang.Object instead of Java.Lang.String — typemap doesn't resolve most-derived type
JnienvTest.NewOpenGenericTypeThrows	Java.Interop/JnienvTest.cs	Open generic creation succeeds when it should throw
JnienvTest.ActivatedDirectThrowableSubclassesShouldBeRegistered	Java.Interop/JnienvTest.cs	Throwable subclass not registered
JavaObjectExtensionsTests.JavaCast_BaseToGenericWrapper	Java.Interop/JavaObjectExtensionsTests.cs	Cannot create instance of open generic type
JavaObjectExtensionsTests.JavaCast_BadInterfaceCast	Java.Interop/JavaObjectExtensionsTests.cs	NotSupportedException instead of InvalidCastException
JavaObjectExtensionsTests.JavaCast_InvalidTypeCastThrows	Java.Interop/JavaObjectExtensionsTests.cs	NotSupportedException instead of InvalidCastException
JavaObjectExtensionsTests.JavaCast_CheckForManagedSubclasses	Java.Interop/JavaObjectExtensionsTests.cs	NotSupportedException instead of InvalidCastException

---

❌ Tests excluded via ExcludedTestNames (external Java.Interop-Tests)

Missing Java Classes

Test(s)	Count	Missing Class
JavaObjectTest.DisposeAccessesThis	1	net.dot.jni.test.GetThis — cannot register native members
InvokeVirtualFromConstructorTests.*	3	net.dot.jni.test.CallVirtualFromConstructorDerived
JniTypeManagerTests.CanCreateGenericHolder, CannotCreateGenericHolderFromJava	2	net.dot.jni.test.GenericHolder

JavaProxyObject / JavaProxyThrowable Not Available

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

Proxy Resolution / Trimmer Gaps

Test(s)	Count	Error
JniValueMarshaler_IJavaPeerable_ContractTests.CreateGenericValue, CreateValue	2	No JavaPeerProxy for java/lang/Object with IJavaPeerable target
JavaPeerableExtensionsTests.JavaAs	1	IJavaInterfaceInvoker ctor trimmed
JavaPeerableExtensionsTests.JavaAs_Exceptions	1	Wrong exception type (ClassNotFoundException vs ArgumentException)
JavaPeerableExtensionsTests.JavaAs_InstanceThatDoesNotImplementInterfaceReturnsNull	1	No JavaPeerProxy for IAndroidInterface

JNI Method Remapping Not Supported

Test(s)	Count
JniPeerMembersTests.ReplaceInstanceMethodName	1
JniPeerMembersTests.ReplaceInstanceMethodWithStaticMethod	1
JniPeerMembersTests.ReplacementTypeUsedForMethodLookup	1
JniPeerMembersTests.ReplaceStaticMethodName	1

Other

Test	Error
JniTypeManagerTests.GetType	JniPrimitiveArrayInfo lookup fails

---

✅ Previously excluded, now passing

Test	Notes
CustomWidgetTests.InflateCustomView_ShouldNotLeakGlobalRefs	Was [Category("TrimmableIgnore")], exclusion removed

---

Summary Table

Category	Count	Mechanism
[Category("TrimmableIgnore")] (our code)	7	ExcludeCategories in .csproj
Missing Java classes	6	ExcludedTestNames
JavaProxyObject/JavaProxyThrowable	24	ExcludedTestNames
Proxy resolution / trimmer gaps	4	ExcludedTestNames
JNI method remapping	4	ExcludedTestNames
Other (JniPrimitiveArrayInfo)	1	ExcludedTestNames
Total excluded	46
Now passing (removed)	1