diff --git a/src/Linker.cs b/src/Linker.cs
index 69c6ad9..2e36b29 100644
--- a/src/Linker.cs
+++ b/src/Linker.cs
@@ -13,8 +13,6 @@ namespace Wasmtime
     /// </summary>
     public partial class Linker : IDisposable
     {
-        private const int StackallocThreshold = 256;
-
         /// <summary>
         /// Constructs a new linker from the given engine.
         /// </summary>
@@ -304,9 +302,11 @@ public Function GetDefaultFunction(Store store, string name)
         public Function? GetFunction(Store store, string module, string name)
         {
             if (store is null)
-            {
                 throw new ArgumentNullException(nameof(store));
-            }
+            if (module is null)
+                throw new ArgumentNullException(nameof(module));
+            if (name is null)
+                throw new ArgumentNullException(nameof(name));
 
             var context = store.Context;
             if (!TryGetExtern(context, module, name, out var ext) || ext.kind != ExternKind.Func)
@@ -329,9 +329,11 @@ public Function GetDefaultFunction(Store store, string name)
         public Table? GetTable(Store store, string module, string name)
         {
             if (store is null)
-            {
                 throw new ArgumentNullException(nameof(store));
-            }
+            if (module is null)
+                throw new ArgumentNullException(nameof(module));
+            if (name is null)
+                throw new ArgumentNullException(nameof(name));
 
             var context = store.Context;
             if (!TryGetExtern(context, module, name, out var ext) || ext.kind != ExternKind.Table)
@@ -354,9 +356,11 @@ public Function GetDefaultFunction(Store store, string name)
         public Memory? GetMemory(Store store, string module, string name)
         {
             if (store is null)
-            {
                 throw new ArgumentNullException(nameof(store));
-            }
+            if (module is null)
+                throw new ArgumentNullException(nameof(module));
+            if (name is null)
+                throw new ArgumentNullException(nameof(name));
 
             var context = store.Context;
             if (!TryGetExtern(context, module, name, out var ext) || ext.kind != ExternKind.Memory)
@@ -379,9 +383,11 @@ public Function GetDefaultFunction(Store store, string name)
         public Global? GetGlobal(Store store, string module, string name)
         {
             if (store is null)
-            {
                 throw new ArgumentNullException(nameof(store));
-            }
+            if (module is null)
+                throw new ArgumentNullException(nameof(module));
+            if (name is null)
+                throw new ArgumentNullException(nameof(name));
 
             var context = store.Context;
             if (!TryGetExtern(context, module, name, out var ext) || ext.kind != ExternKind.Global)
@@ -412,19 +418,15 @@ public void Dispose()
         public void DefineFunction(string module, string name, Function.UntypedCallbackDelegate callback, IReadOnlyList<ValueKind> parameterKinds, IReadOnlyList<ValueKind> resultKinds)
         {
             if (module is null)
-            {
                 throw new ArgumentNullException(nameof(module));
-            }
-
             if (name is null)
-            {
                 throw new ArgumentNullException(nameof(name));
-            }
-
             if (callback is null)
-            {
                 throw new ArgumentNullException(nameof(callback));
-            }
+            if (parameterKinds is null)
+                throw new ArgumentNullException(nameof(parameterKinds));
+            if (resultKinds is null)
+                throw new ArgumentNullException(nameof(resultKinds));
 
             unsafe
             {
diff --git a/tests/ExternTests.cs b/tests/ExternTests.cs
new file mode 100644
index 0000000..9ca4c6f
--- /dev/null
+++ b/tests/ExternTests.cs
@@ -0,0 +1,57 @@
+using System.Diagnostics;
+using Xunit;
+
+namespace Wasmtime.Tests;
+
+public class ExternTests
+{
+    [Fact]
+    public void ExternFunc_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternFunc), default);
+    }
+
+    [Fact]
+    public void ExternTable_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternTable), default);
+    }
+
+    [Fact]
+    public void ExternMemory_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternMemory), default);
+    }
+
+    [Fact]
+    public void ExternInstance_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternInstance), default);
+    }
+
+    [Fact]
+    public void ExternGlobal_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternGlobal), default);
+    }
+
+    [Fact]
+    public void ExternUnion_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(ExternUnion), default);
+        Assert.Equal(default(Extern), default);
+    }
+
+    [Fact]
+    public void Extern_StaticCheck()
+    {
+        // An assertion is made in the static constructor. Doing this forces the static constructor to run
+        Assert.Equal(default(Extern), default);
+    }
+}
\ No newline at end of file
diff --git a/tests/LinkerFunctionsTests.cs b/tests/LinkerFunctionsTests.cs
index 07a70f9..e8b169e 100644
--- a/tests/LinkerFunctionsTests.cs
+++ b/tests/LinkerFunctionsTests.cs
@@ -237,15 +237,61 @@ public void ItReturnsNullForUndefinedFunctions()
         }
 
         [Fact]
-        public void ItBindsComplexFunction()
+        public void GetFunctionThrowsWithNullStore()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.GetFunction(null!, "module", "name"));
+        }
+
+        [Fact]
+        public void GetFunctionThrowsWithNullName()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.GetFunction(Store, "module", null!));
+        }
+
+        [Fact]
+        public void GetFunctionThrowsWithNullModule()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.GetFunction(Store, null!, "name"));
+        }
+
+        [Fact]
+        public void DefineFunctionThrowsWithNullModule()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.DefineFunction(null!, "name", (c, p, r) => { }, [ ValueKind.Int32 ], []));
+        }
+
+        [Fact]
+        public void DefineFunctionThrowsWithNullName()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.DefineFunction("", null!, (c, p, r) => { }, [ValueKind.Int32], []));
+        }
+
+        [Fact]
+        public void DefineFunctionThrowsWithNullCallback()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.DefineFunction("", "name", null!, [ValueKind.Int32], []));
+        }
+        
+        [Fact]
+        public void DefineFunctionThrowsWithNullParameters()
         {
-            using var store = new Store(Fixture.Engine);
+            Assert.Throws<ArgumentNullException>(() => Linker.DefineFunction("", "name", (c, p, r) => { }, null!, []));
+        }
+
+        [Fact]
+        public void DefineFunctionThrowsWithNullResults()
+        {
+            Assert.Throws<ArgumentNullException>(() => Linker.DefineFunction("", "name", (c, p, r) => { }, [ValueKind.Int32], null!));
+        }
 
+        [Fact]
+        public void ItBindsComplexFunction()
+        {
             Linker.DefineFunction("", "complex", (c, p, r) =>
                 {
                     p.Length.Should().Be(0);
                     r.Length.Should().Be(19);
-                    for (int i = 0; i < r.Length; ++i)
+                    for (var i = 0; i < r.Length; ++i)
                     {
                         r[i] = i + 1;
                     }
@@ -254,7 +300,7 @@ public void ItBindsComplexFunction()
                 Enumerable.Repeat(ValueKind.Int32, 19).ToArray()
             );
 
-            var func = Linker.GetFunction(store, "", "complex");
+            var func = Linker.GetFunction(Store, "", "complex");
             func.Should().NotBeNull();
         }
 
diff --git a/tests/LinkerTests.cs b/tests/LinkerTests.cs
new file mode 100644
index 0000000..6bab78e
--- /dev/null
+++ b/tests/LinkerTests.cs
@@ -0,0 +1,160 @@
+using System;
+using Xunit;
+
+namespace Wasmtime.Tests;
+
+public sealed class LinkerFixture : ModuleFixture
+{
+    protected override string ModuleFileName => "FunctionExports.wat";
+}
+
+public sealed class LinkerTests
+    : IClassFixture<LinkerFixture>, IDisposable
+{
+    private Store Store { get; }
+    private Linker Linker { get; }
+
+    public LinkerTests(LinkerFixture fixture)
+    {
+        Fixture = fixture;
+        Linker = new Linker(Fixture.Engine);
+        Store = new Store(Fixture.Engine);
+    }
+
+    public LinkerFixture Fixture { get; }
+
+    public void Dispose()
+    {
+        Linker.Dispose();
+        Store.Dispose();
+    }
+
+    [Fact]
+    public void ItThrowsWithNullEngine()
+    {
+        Assert.Throws<ArgumentNullException>(() => new Linker(null!));
+    }
+
+    [Fact]
+    public void DefineThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentException>(() => Linker.Define("module", "name", Function.Null));
+    }
+
+    [Fact]
+    public void DefineThrowsWithNullModule()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.Define(null!, "name", new Global(Store, ValueKind.Int32, 1, Mutability.Immutable)));
+    }
+
+    [Fact]
+    public void DefineThrowsWithNullName()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.Define("module", null!, new Global(Store, ValueKind.Int32, 1, Mutability.Immutable)));
+    }
+
+    [Fact]
+    public void DefineModuleThrowsWithNullModule()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.DefineModule(Store, null!));
+    }
+
+    [Fact]
+    public void DefineModuleThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.DefineModule(null!, Fixture.Module));
+    }
+
+    [Fact]
+    public void DefineWasiTwiceThrows()
+    {
+        Linker.DefineWasi();
+        Assert.Throws<WasmtimeException>(() => Linker.DefineWasi());
+    }
+
+    [Fact]
+    public void GetDefaultFunctionThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetDefaultFunction(null!, "name"));
+    }
+
+    [Fact]
+    public void GetDefaultFunctionThrowsWithNullName()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetDefaultFunction(Store, null!));
+    }
+
+    [Fact]
+    public void GetTableThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetTable(null!, "module", "name"));
+    }
+
+    [Fact]
+    public void GetTableThrowsWithNullModule()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetTable(Store, null!, "name"));
+    }
+
+    [Fact]
+    public void GetTableThrowsWithNullName()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetTable(Store, "module", null!));
+    }
+
+    [Fact]
+    public void GetMemoryThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetMemory(null!, "module", "name"));
+    }
+
+    [Fact]
+    public void GetMemoryThrowsWithNullModule()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetMemory(Store, null!, "name"));
+    }
+
+    [Fact]
+    public void GetMemoryThrowsWithNullName()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetMemory(Store, "module", null!));
+    }
+
+    [Fact]
+    public void GetGlobalThrowsWithNullStore()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetGlobal(null!, "module", "name"));
+    }
+
+    [Fact]
+    public void GetGlobalThrowsWithNullModule()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetGlobal(Store, null!, "name"));
+    }
+
+    [Fact]
+    public void GetGlobalThrowsWithNullName()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.GetGlobal(Store, "module", null!));
+    }
+
+    [Fact]
+    public void DefineInstanceThrowsWithNullStore()
+    {
+        var instance = new Instance(Store, Fixture.Module);
+        Assert.Throws<ArgumentNullException>(() => Linker.DefineInstance(null!, "name", instance));
+    }
+
+    [Fact]
+    public void DefineInstanceThrowsWithNullName()
+    {
+        var instance = new Instance(Store, Fixture.Module);
+        Assert.Throws<ArgumentNullException>(() => Linker.DefineInstance(Store, null!, instance));
+    }
+
+    [Fact]
+    public void DefineInstanceThrowsWithNullInstance()
+    {
+        Assert.Throws<ArgumentNullException>(() => Linker.DefineInstance(Store, "name", null!));
+    }
+}
\ No newline at end of file