Improved some test coverage. (#192)

Fixed one small issue in the process:
 - Modified `wasmtime_engine_increment_epoch` to return `void` instead of `IntPtr`. Based on signature from these docs: https://docs.wasmtime.dev/c-api/engine_8h.html

Author: martindevans

src/Engine.cs

@@ -84,7 +84,7 @@ private static class Native
             public static extern void wasm_engine_delete(IntPtr engine);
 
             [DllImport(LibraryName)]
-            public static extern IntPtr wasmtime_engine_increment_epoch(IntPtr engine);
+            public static extern void wasmtime_engine_increment_epoch(IntPtr engine);
         }
 
         private readonly Handle handle;

tests/ConfigTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using FluentAssertions;
 using Xunit;
 
@@ -16,6 +17,15 @@ public void ItSetsCompilerStrategy()
             using var engine = new Engine(config);
         }
 
+        [Fact]
+        public void ItFailsSettingNonexistantCompilerStrategy()
+        {
+            var config = new Config();
+
+            var act = () => { config.WithCompilerStrategy((CompilerStrategy)123); };
+            act.Should().Throw<ArgumentOutOfRangeException>();
+        }
+
         [Fact]
         public void ItSetsProfilingStrategy()
         {
@@ -26,6 +36,15 @@ public void ItSetsProfilingStrategy()
             using var engine = new Engine(config);
         }
 
+        [Fact]
+        public void ItFailsSettingNonexistantProfilingStrategy()
+        {
+            var config = new Config();
+
+            var act = () => { config.WithProfilingStrategy((ProfilingStrategy)123); };
+            act.Should().Throw<ArgumentOutOfRangeException>();
+        }
+
         [Fact]
         public void ItSetsOptimizationLevel()
         {
@@ -36,6 +55,15 @@ public void ItSetsOptimizationLevel()
             using var engine = new Engine(config);
         }
 
+        [Fact]
+        public void ItFailsSettingNonexistantOptimizationLevel()
+        {
+            var config = new Config();
+
+            var act = () => { config.WithOptimizationLevel((OptimizationLevel)123); };
+            act.Should().Throw<ArgumentOutOfRangeException>();
+        }
+
         [Fact]
         public void ItSetsNanCanonicalization()
         {
@@ -55,5 +83,71 @@ public void ItSetsEpochInterruption()
 
             using var engine = new Engine(config);
         }
+
+        [Fact]
+        public void ItSetsDebugInfo()
+        {
+            var config = new Config();
+
+            config.WithDebugInfo(true);
+
+            using var engine = new Engine(config);
+        }
+
+        [Fact]
+        public void ItSetsThreads()
+        {
+            var config = new Config();
+            config.WithWasmThreads(true);
+
+            using var engine = new Engine(config);
+            using var module = Module.FromTextFile(engine, Path.Combine("Modules", "SharedMemory.wat"));
+        }
+
+        [Fact]
+        public void ItSetsSIMD()
+        {
+            var config = new Config();
+            config.WithSIMD(false);
+
+            Action act = () =>
+            {
+                using var engine = new Engine(config);
+                using var module = Module.FromTextFile(engine, Path.Combine("Modules", "SIMD.wat"));
+            };
+
+            act.Should().Throw<WasmtimeException>();
+        }
+
+        [Fact]
+        public void ItSetsBulkMemory()
+        {
+            var config = new Config();
+            config.WithBulkMemory(false);
+            config.WithReferenceTypes(false);
+
+            Action act = () =>
+            {
+                using var engine = new Engine(config);
+                using var module = Module.FromTextFile(engine, Path.Combine("Modules", "BulkMemory.wat"));
+            };
+
+            act.Should().Throw<WasmtimeException>();
+        }
+
+        [Fact]
+        public void ItSetsMultiValue()
+        {
+            var config = new Config();
+            config.WithMultiValue(false);
+
+            Action act = () =>
+            {
+                using var engine = new Engine(config);
+                using var module = Module.FromTextFile(engine, Path.Combine("Modules", "MultiValue.wat"));
+            };
+
+            act.Should().Throw<WasmtimeException>();
+        }
     }
 }

tests/GlobalImportBindingTests.cs

@@ -106,6 +106,24 @@ public void ItFailsToInstantiateWhenGlobalIsMut()
                 .WithMessage("incompatible import type for `::global_i32`*");
         }
 
+        [Fact]
+        public void ItFailsBindingGlobalsWithWrongType()
+        {
+            var global_i32_mut = new Global(Store, ValueKind.Int32, 0, Mutability.Mutable);
+
+            global_i32_mut.Wrap<float>().Should().BeNull();
+            global_i32_mut.Wrap<double>().Should().BeNull();
+            global_i32_mut.Wrap<uint>().Should().BeNull();
+        }
+
+        [Fact]
+        public void ItFailsMutatingImmutableGlobal()
+        {
+            var global_i32_mut = new Global(Store, ValueKind.Int32, 0, Mutability.Immutable);
+            Action action = () => global_i32_mut.Wrap<int>()!.SetValue(3);
+            action.Should().Throw<InvalidOperationException>();
+        }
+
         [Fact]
         public void ItBindsTheGlobalsCorrectly()
         {

tests/Modules/BulkMemory.wat

@@ -0,0 +1,9 @@
+(module
+  (func (param $dst i32) (param $src i32) (param $size i32) (result i32)
+	  local.get $dst
+	  local.get $src
+	  local.get $size
+	  memory.copy
+	  local.get $dst
+  )
+)

tests/Modules/MultiValue.wat

@@ -0,0 +1,4 @@
+(module
+  (func $echo_tuple2 (result i32 i32) i32.const 1 i32.const 2)
+  (export "$echo_tuple2" (func $echo_tuple2))
+)

tests/Modules/SIMD.wat

@@ -0,0 +1,4 @@
+(module
+  (func $echo_v128 (param v128) (result v128) local.get 0)
+  (export "$echo_v128" (func $echo_v128))
+)

tests/Modules/SharedMemory.wat

@@ -0,0 +1,3 @@
+(module
+  (memory 1 1 shared)
+)