NonNullablePropertyHelper uses NullabilityInfoContext to get info about nullability of the given property. There was used WriteState to get that info. But when property has no setter, WriteState is null.
The fix is to use ReadState instead WriteState, because property has to have getter when it should be validated.
I've created separate commit with failing tests to repro the bug: b6ba1c0e55743304448e6e3522a89c0afca2e445
NonNullablePropertyHelperusesNullabilityInfoContextto get info about nullability of the given property. There was usedWriteStateto get that info. But when property has no setter,WriteStateisnull.The fix is to use
ReadStateinsteadWriteState, because property has to have getter when it should be validated.I've created separate commit with failing tests to repro the bug: b6ba1c0e55743304448e6e3522a89c0afca2e445
Tests that fail:
NonNullablePropertyHelperTests.IsNonNullableReferenceType_Identifies_Correct_Properties_Of_ClassTryValidate.PropertyWithoutSetter_Nullable_Valid_When_NullThis PR solves #16