diff --git a/LR35902/LR35902.FuseTest/LR35902.FuseTest.csproj b/LR35902/LR35902.FuseTest/LR35902.FuseTest.csproj
index 1c14afc..cf1e497 100644
--- a/LR35902/LR35902.FuseTest/LR35902.FuseTest.csproj
+++ b/LR35902/LR35902.FuseTest/LR35902.FuseTest.csproj
@@ -22,6 +22,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -59,6 +60,7 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />
+    <AdditionalFiles Include="stylecop.json" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\EightBit\EightBit.csproj">
diff --git a/LR35902/LR35902.FuseTest/Lines.cs b/LR35902/LR35902.FuseTest/Lines.cs
index 31e30c8..8ee525d 100644
--- a/LR35902/LR35902.FuseTest/Lines.cs
+++ b/LR35902/LR35902.FuseTest/Lines.cs
@@ -1,5 +1,6 @@
 namespace Fuse
 {
+    using System;
     using System.Collections.Generic;
     using System.IO;
 
@@ -15,22 +16,21 @@
 
         public void Read()
         {
-            using (var reader = new StreamReader(this.path))
+            using (var reader = File.OpenText(this.path))
             {
                 while (!reader.EndOfStream)
                 {
                     var line = reader.ReadLine();
-                    var ignored = line.StartsWith(";");
+                    var ignored = line.StartsWith(";", StringComparison.OrdinalIgnoreCase);
                     if (!ignored)
                     {
                         this.lines.Add(line);
                     }
                 }
             }
-            if (this.lines.Count > 0)
-            {
-                this.position = 0;
-            }
+
+            // Users should check EndOfFile before using a bad position...
+            this.position = 0;
         }
 
         public string ReadLine()
diff --git a/LR35902/LR35902.FuseTest/MemoryDatum.cs b/LR35902/LR35902.FuseTest/MemoryDatum.cs
index 7cd836c..6dafb9c 100644
--- a/LR35902/LR35902.FuseTest/MemoryDatum.cs
+++ b/LR35902/LR35902.FuseTest/MemoryDatum.cs
@@ -2,21 +2,34 @@
 {
     using System;
     using System.Collections.Generic;
+    using System.Collections.ObjectModel;
 
     public class MemoryDatum
     {
+        private readonly List<byte> bytes = new List<byte>();
+
         public ushort Address { get; private set; } = (ushort)EightBit.Mask.Mask16;
 
-        public List<byte> Bytes { get; } = new List<byte>();
+        public ReadOnlyCollection<byte> Bytes => this.bytes.AsReadOnly();
 
         public void Parse(string line)
         {
+            if (string.IsNullOrWhiteSpace(line))
+            {
+                throw new ArgumentNullException(nameof(line));
+            }
+
             var tokens = line.Split(new char[] { ' ', '\t' });
             this.Parse(tokens);
         }
 
         public void Parse(string[] tokens)
         {
+            if (tokens == null)
+            {
+                throw new ArgumentNullException(nameof(tokens));
+            }
+
             this.Address = Convert.ToUInt16(tokens[0], 16);
 
             var finished = false;
@@ -26,7 +39,7 @@
                 finished = token == "-1";
                 if (!finished)
                 {
-                    this.Bytes.Add(Convert.ToByte(token, 16));
+                    this.bytes.Add(Convert.ToByte(token, 16));
                 }
             }
         }
diff --git a/LR35902/LR35902.FuseTest/RegisterState.cs b/LR35902/LR35902.FuseTest/RegisterState.cs
index 9281274..384fb55 100644
--- a/LR35902/LR35902.FuseTest/RegisterState.cs
+++ b/LR35902/LR35902.FuseTest/RegisterState.cs
@@ -2,7 +2,8 @@
 {
     using System;
     using System.Collections.Generic;
-
+    using System.Collections.ObjectModel;
+    using System.Globalization;
     using EightBit;
 
     public class RegisterState
@@ -12,8 +13,12 @@
             AF, BC, DE, HL, SP, PC
         };
 
-        public List<Register16> Registers { get; } = new List<Register16>();
+        private readonly List<Register16> registers = new List<Register16>();
+
+        public ReadOnlyCollection<Register16> Registers => this.registers.AsReadOnly();
+
         public bool Halted { get; private set; } = false;
+
         public int TStates { get; private set; } = -1;
 
         public void Parse(Lines lines)
@@ -32,8 +37,8 @@
 
         private void ParseInternalState(string[] tokens)
         {
-            this.Halted = Convert.ToInt32(tokens[0]) == 1;
-            this.TStates = Convert.ToInt32(tokens[1]);
+            this.Halted = Convert.ToInt32(tokens[0], CultureInfo.InvariantCulture) == 1;
+            this.TStates = Convert.ToInt32(tokens[1], CultureInfo.InvariantCulture);
         }
 
         private void ParseExternalState(Lines lines)
@@ -41,7 +46,7 @@
             var line = lines.ReadLine();
             foreach (var token in line.Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries))
             {
-                this.Registers.Add(new Register16(Convert.ToUInt16(token, 16)));
+                this.registers.Add(new Register16(Convert.ToUInt16(token, 16)));
             }
         }
     }
diff --git a/LR35902/LR35902.FuseTest/Result.cs b/LR35902/LR35902.FuseTest/Result.cs
index 1db4900..23d69c4 100644
--- a/LR35902/LR35902.FuseTest/Result.cs
+++ b/LR35902/LR35902.FuseTest/Result.cs
@@ -1,10 +1,13 @@
 namespace Fuse
 {
+    using System;
     using System.Collections.Generic;
+    using System.Collections.ObjectModel;
 
     public class Result
     {
         private readonly TestEvents events = new TestEvents();
+        private readonly List<MemoryDatum> memoryData = new List<MemoryDatum>();
 
         public bool Valid => !string.IsNullOrEmpty(this.Description);
 
@@ -12,10 +15,15 @@
 
         public RegisterState RegisterState { get; } = new RegisterState();
 
-        public List<MemoryDatum> MemoryData { get; } = new List<MemoryDatum>();
+        public ReadOnlyCollection<MemoryDatum> MemoryData => this.memoryData.AsReadOnly();
 
         public void Parse(Lines lines)
         {
+            if (lines == null)
+            {
+                throw new ArgumentNullException(nameof(lines));
+            }
+
             while (!lines.EndOfFile && !this.Valid)
             {
                 this.Description = lines.ReadLine();
@@ -38,7 +46,7 @@
                 {
                     var datum = new MemoryDatum();
                     datum.Parse(line);
-                    this.MemoryData.Add(datum);
+                    this.memoryData.Add(datum);
                 }
             }
             while (!finished);
diff --git a/LR35902/LR35902.FuseTest/Test.cs b/LR35902/LR35902.FuseTest/Test.cs
index 5674937..b59f7fa 100644
--- a/LR35902/LR35902.FuseTest/Test.cs
+++ b/LR35902/LR35902.FuseTest/Test.cs
@@ -1,19 +1,27 @@
 namespace Fuse
 {
+    using System;
     using System.Collections.Generic;
 
     public class Test
     {
+        private List<MemoryDatum> memoryData = new List<MemoryDatum>();
+
         public bool Valid => !string.IsNullOrEmpty(this.Description);
 
         public string Description { get; private set; }
 
         public RegisterState RegisterState { get; } = new RegisterState();
 
-        public List<MemoryDatum> MemoryData { get; } = new List<MemoryDatum>();
+        public IReadOnlyCollection<MemoryDatum> MemoryData => this.memoryData.AsReadOnly();
 
         public void Parse(Lines lines)
         {
+            if (lines == null)
+            {
+                throw new ArgumentNullException(nameof(lines));
+            }
+
             while (!lines.EndOfFile && !this.Valid)
             {
                 this.Description = lines.ReadLine();
@@ -35,7 +43,7 @@
                 {
                     var datum = new MemoryDatum();
                     datum.Parse(line);
-                    this.MemoryData.Add(datum);
+                    this.memoryData.Add(datum);
                 }
             }
             while (!finished);
diff --git a/LR35902/LR35902.FuseTest/TestEvent.cs b/LR35902/LR35902.FuseTest/TestEvent.cs
index 3897a8d..a133646 100644
--- a/LR35902/LR35902.FuseTest/TestEvent.cs
+++ b/LR35902/LR35902.FuseTest/TestEvent.cs
@@ -19,6 +19,11 @@
 
         public void Parse(Lines lines)
         {
+            if (lines == null)
+            {
+                throw new ArgumentNullException(nameof(lines));
+            }
+
             this.ParseLine(lines.ReadLine());
             if (!this.Valid)
             {
diff --git a/LR35902/LR35902.FuseTest/TestEvents.cs b/LR35902/LR35902.FuseTest/TestEvents.cs
index 5d85337..3a788cd 100644
--- a/LR35902/LR35902.FuseTest/TestEvents.cs
+++ b/LR35902/LR35902.FuseTest/TestEvents.cs
@@ -1,10 +1,13 @@
 namespace Fuse
 {
     using System.Collections.Generic;
+    using System.Collections.ObjectModel;
 
     public class TestEvents
     {
-        public List<TestEvent> Container { get; } = new List<TestEvent>();
+        private readonly List<TestEvent> container = new List<TestEvent>();
+
+        public ReadOnlyCollection<TestEvent> Container => this.container.AsReadOnly();
 
         public void Parse(Lines lines)
         {
@@ -16,7 +19,7 @@
 		        complete = !e.Valid;
                 if (!complete)
                 {
-                    this.Container.Add(e);
+                    this.container.Add(e);
                 }
             }
             while (!complete);
diff --git a/LR35902/LR35902.FuseTest/TestRunner.cs b/LR35902/LR35902.FuseTest/TestRunner.cs
index 3f48792..7154b2b 100644
--- a/LR35902/LR35902.FuseTest/TestRunner.cs
+++ b/LR35902/LR35902.FuseTest/TestRunner.cs
@@ -3,13 +3,13 @@
     public class TestRunner : EightBit.GameBoy.Bus
     {
         private readonly Test test;
-        private readonly Result expected;
+        private readonly Result result;
         private readonly EightBit.Ram ram = new EightBit.Ram(0x10000);
 
-        public TestRunner(Test test, Result expected)
+        public TestRunner(Test test, Result result)
         {
             this.test = test;
-            this.expected = expected;
+            this.result = result;
         }
 
         public bool Failed { get; private set; } = false;
@@ -87,7 +87,7 @@
 
         private void Checkregisters()
         {
-            var expectedState = this.expected.RegisterState;
+            var expectedState = this.result.RegisterState;
             var expectedRegisters = expectedState.Registers;
 
             var af = this.CPU.AF.Word == expectedRegisters[(int)RegisterState.Register.AF].Word;
@@ -152,7 +152,7 @@
         {
             var first = true;
 
-            foreach (var memoryDatum in this.expected.MemoryData)
+            foreach (var memoryDatum in this.result.MemoryData)
             {
                 var address = memoryDatum.Address;
                 foreach (var expected in memoryDatum.Bytes)
diff --git a/LR35902/LR35902.FuseTest/stylecop.json b/LR35902/LR35902.FuseTest/stylecop.json
new file mode 100644
index 0000000..3af08b4
--- /dev/null
+++ b/LR35902/LR35902.FuseTest/stylecop.json
@@ -0,0 +1,19 @@
+{
+  // ACTION REQUIRED: This file was automatically added to your project, but it
+  // will not take effect until additional steps are taken to enable it. See the
+  // following page for additional information:
+  //
+  // https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/EnableConfiguration.md
+
+  "$schema": "https://raw.githubusercontent.com/DotNetAnalyzers/StyleCopAnalyzers/master/StyleCop.Analyzers/StyleCop.Analyzers/Settings/stylecop.schema.json",
+  "settings": {
+    "documentationRules": {
+      "documentInterfaces": false,
+      "documentExposedElements": false,
+      "documentInternalElements": false,
+      "documentPrivateElements": false,
+      "documentPrivateFields": false,
+      "companyName": "Adrian Conlon"
+    }
+  }
+}