From 3faae25e67b1085159cdda198cf4865bc45da4e0 Mon Sep 17 00:00:00 2001
From: Vitek Karas <10670590+vitek-karas@users.noreply.github.com>
Date: Thu, 9 Dec 2021 15:10:02 +0100
Subject: Adds a test for GetMethod with wrong binding flags (#2433)

See https://github.com/dotnet/linker/issues/2432 for details.
---
 .../Reflection/MethodUsedViaReflection.cs          | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)

(limited to 'test/Mono.Linker.Tests.Cases')

diff --git a/test/Mono.Linker.Tests.Cases/Reflection/MethodUsedViaReflection.cs b/test/Mono.Linker.Tests.Cases/Reflection/MethodUsedViaReflection.cs
index bff3994a2..7a9475542 100644
--- a/test/Mono.Linker.Tests.Cases/Reflection/MethodUsedViaReflection.cs
+++ b/test/Mono.Linker.Tests.Cases/Reflection/MethodUsedViaReflection.cs
@@ -19,6 +19,10 @@ namespace Mono.Linker.Tests.Cases.Reflection
 			GetMethod_Name_BindingAttr.TestUnknownBindingFlags (BindingFlags.Public);
 			GetMethod_Name_BindingAttr.TestUnknownBindingFlagsAndName (BindingFlags.Public, "DoesntMatter");
 			GetMethod_Name_BindingAttr.TestUnknownNullBindingFlags (BindingFlags.Public);
+			GetMethod_Name_BindingAttr.TestWrongBindingFlags ();
+			GetMethod_Name_BindingAttr.TestNullName ();
+			GetMethod_Name_BindingAttr.TestUnknownName ("Unknown");
+			GetMethod_Name_BindingAttr.TestUnknownNameAndWrongBindingFlags ("Unknown");
 			GetMethod_Name_BindingAttr_Binder_Types_Modifiers.TestNameBindingFlagsAndParameterModifier ();
 			GetMethod_Name_BindingAttr_Binder_CallConvention_Types_Modifiers.TestNameBindingFlagsCallingConventionParameterModifier ();
 #if NETCOREAPP
@@ -265,6 +269,74 @@ namespace Mono.Linker.Tests.Cases.Reflection
 				var method = typeof (NullBindingFlags).GetMethod ("OnlyCalledViaReflection", bf);
 				method.Invoke (null, new object[] { });
 			}
+
+			[Kept]
+			private class WrongBindingFlags
+			{
+				// Unnecessarily kept: https://github.com/dotnet/linker/issues/2432
+				[Kept]
+				private static void One () { }
+
+				// Unnecessarily kept: https://github.com/dotnet/linker/issues/2432
+				[Kept]
+				public static void Two () { }
+			}
+
+			[Kept]
+			public static void TestWrongBindingFlags ()
+			{
+				// Specifying just Static will never return anything (Public or NonPublic is required on top)
+				// So this doesn't need to mark anything.
+				typeof (WrongBindingFlags).GetMethod ("One", BindingFlags.Static);
+				typeof (WrongBindingFlags).GetMethod ("Two", BindingFlags.Static);
+			}
+
+			[Kept]
+			private class NullName
+			{
+				private static void Known () { }
+
+				[Kept] // Currently this is kept as we don't have a special case for null constant (not worth it)
+				public void AlsoKnown () { }
+			}
+
+			[Kept]
+			public static void TestNullName ()
+			{
+				// null will actually throw exception at runtime, so there's no need to mark anything
+				typeof (NullName).GetMethod (null, BindingFlags.Public);
+			}
+
+			[Kept]
+			private class UnknownName
+			{
+				private static void Known () { }
+
+				[Kept]
+				public void AlsoKnown () { }
+			}
+
+			[Kept]
+			public static void TestUnknownName (string name)
+			{
+				typeof (UnknownName).GetMethod (name, BindingFlags.Public);
+			}
+
+			[Kept]
+			private class UnknownNameAndWrongBindingFlags
+			{
+				private static void Known () { }
+
+				public void AlsoKnown () { }
+			}
+
+			[Kept]
+			public static void TestUnknownNameAndWrongBindingFlags (string name)
+			{
+				// The binding flags like this will not return any methods (it's a valid call, but never returns anything)
+				// So it's OK to not mark any method due to this.
+				typeof (UnknownNameAndWrongBindingFlags).GetMethod (name, BindingFlags.Static);
+			}
 		}
 
 		// GetMethod(string name, BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers)
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