Add a sample test for dotnet/linker#1617 - unknown binding flags (dot…

…net/linker#1619)

Commit migrated from dotnet/linker@8ee2557

src/tools/illink/test/Mono.Linker.Tests.Cases/Reflection/MethodUsedViaReflection.cs

@@ -14,6 +14,7 @@ public static void Main ()
 			TestName ();
 			TestNamePrivate ();
 			TestNameAndExplicitBindingFlags ();
+			// TestNameAndUnknownBindingFlags (BindingFlags.Public);
 			TestNameAndType ();
 			TestNameBindingFlagsAndParameterModifier ();
 			TestNameBindingFlagsCallingConventionParameterModifier ();
@@ -61,6 +62,16 @@ static void TestNameAndExplicitBindingFlags ()
 			method.Invoke (null, new object[] { });
 		}
 
+		// https://github.com/mono/linker/issues/1617
+		//[Kept]
+		//[RecognizedReflectionAccessPattern]
+		//static void TestNameAndUnknownBindingFlags (BindingFlags bindingFlags)
+		//{
+		//	// Since the binding flags are not known linker should mark all methods on the type
+		//	var method = typeof (TestNameAndUnknownBindingClass).GetMethod ("OnlyCalledViaReflection", bindingFlags);
+		//	method.Invoke (null, new object[] { });
+		//}
+
 		[Kept]
 		[RecognizedReflectionAccessPattern (
 			typeof (Type), nameof (Type.GetMethod), new Type[] { typeof (string), typeof (Type[]) },
@@ -283,6 +294,34 @@ public static int OnlyCalledViaReflection (int foo, int bar, int baz)
 			}
 		}
 
+		//[Kept]
+		//private class TestNameAndUnknownBindingClass
+		//{
+		//	[Kept]
+		//	private static int OnlyCalledViaReflection ()
+		//	{
+		//		return 42;
+		//	}
+
+		//	[Kept]
+		//	private int OnlyCalledViaReflection (int foo)
+		//	{
+		//		return 43;
+		//	}
+
+		//	[Kept]
+		//	public int OnlyCalledViaReflection (int foo, int bar)
+		//	{
+		//		return 44;
+		//	}
+
+		//	[Kept]
+		//	public static int OnlyCalledViaReflection (int foo, int bar, int baz)
+		//	{
+		//		return 45;
+		//	}
+		//}
+
 		[Kept]
 		private class TestNameAndTypeClass
 		{