Added out of bounds memory access tests.

Author: Håvar Nøvik

crates/misc/dotnet/tests/Modules/OutOfBoundsMemoryAccess.wat

@@ -0,0 +1,5 @@
+(module
+  (import "" "mem" (memory $m 1 2))
+  (data (i32.const 65535) "\01")
+  (data (i32.const 65536) "\02")
+)

crates/misc/dotnet/tests/OutOfBoundsMemoryAccessTests.cs

@@ -0,0 +1,50 @@
+using System;
+
+using FluentAssertions;
+
+using Xunit;
+
+namespace Wasmtime.Tests
+{
+    public class OutOfBoundsMemoryAccessFixture : ModuleFixture
+    {
+        protected override string ModuleFileName => "OutOfBoundsMemoryAccess.wat";
+    }
+
+    public class OutOfBoundsMemoryAccessTests : IClassFixture<OutOfBoundsMemoryAccessFixture>
+    {
+        public OutOfBoundsMemoryAccessTests(OutOfBoundsMemoryAccessFixture fixture)
+        {
+
+            Fixture = fixture;
+
+            Fixture.Host.ClearDefinitions();
+        }
+
+        private OutOfBoundsMemoryAccessFixture Fixture { get; set; }
+
+        [Fact]
+        public void ItDoesNotThrowsOnOutOfBoundsMemoryAccess()
+        {
+            var mem = Fixture.Host.DefineMemory("", "mem", minimum: 2, maximum: 2);
+
+            using var instance = Fixture.Host.Instantiate(Fixture.Module);
+
+            mem.ReadByte(65535).Should().Be(1);
+            mem.ReadByte(65536).Should().Be(2);
+        }
+
+        [Fact]
+        public void ItThrowsOnOutOfBoundsMemoryAccess()
+        {
+            var mem = Fixture.Host.DefineMemory("", "mem", minimum: 1, maximum: 1);
+
+            Action action = () => { using var instance = Fixture.Host.Instantiate(Fixture.Module); };
+
+            action
+                .Should()
+                .Throw<TrapException>()
+                .WithMessage("wasm trap: out of bounds memory access, source location: @-");
+        }
+    }
+}