From d73afc9e566a664ec1c4885764245ed6862743be Mon Sep 17 00:00:00 2001
From: jnosek <jnosek@gmail.com>
Date: Tue, 14 Jul 2020 13:54:00 -0400
Subject: [PATCH] TransferControl base unit tests

---
 AGC/Instructions/TransferControl.cs           |  7 +--
 AGC/Memory/MemoryWord.cs                      |  2 +
 .../Instructions/TransferControlTests.cs      | 47 +++++++++++++++++++
 3 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 Tests/AGC.Tests/Instructions/TransferControlTests.cs

diff --git a/AGC/Instructions/TransferControl.cs b/AGC/Instructions/TransferControl.cs
index 4cab903..61b9615 100644
--- a/AGC/Instructions/TransferControl.cs
+++ b/AGC/Instructions/TransferControl.cs
@@ -1,6 +1,4 @@
-using Apollo.Virtual.AGC.Math;
-
-namespace Apollo.Virtual.AGC.Instructions
+namespace Apollo.Virtual.AGC.Instructions
 {
     /// <summary>
     /// TC - 0000
@@ -12,6 +10,9 @@ namespace Apollo.Virtual.AGC.Instructions
     public class TransferControl : IInstruction
     {
         private const ushort _code = 0x0;
+        private const ushort _instruction = _code << 12;
+
+        public static ushort Encode(ushort address) => (ushort)(_instruction | address);
 
         public TransferControl(Processor cpu)
         {
diff --git a/AGC/Memory/MemoryWord.cs b/AGC/Memory/MemoryWord.cs
index f2c6f53..a80135c 100644
--- a/AGC/Memory/MemoryWord.cs
+++ b/AGC/Memory/MemoryWord.cs
@@ -1,12 +1,14 @@
 using Apollo.Virtual.AGC.Math;
 using System.Diagnostics;
 using System.Threading.Tasks;
+using System.Diagnostics;
 
 namespace Apollo.Virtual.AGC.Memory
 {
     /// <summary>
     /// Default 15-bit ones compliment memory word
     /// </summary>
+    [DebuggerDisplay("{Read()}")]
     public class MemoryWord : IWord
     {
         private MemoryBank bank;
diff --git a/Tests/AGC.Tests/Instructions/TransferControlTests.cs b/Tests/AGC.Tests/Instructions/TransferControlTests.cs
new file mode 100644
index 0000000..63fe590
--- /dev/null
+++ b/Tests/AGC.Tests/Instructions/TransferControlTests.cs
@@ -0,0 +1,47 @@
+using Apollo.Virtual.AGC.Instructions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AGC.Tests.Instructions
+{
+    [TestClass]
+    public class TransferControlTests : BaseTest
+    {
+        [TestMethod]
+        public void TransferControl_Default()
+        {
+            // arrange
+
+            // set Z, start execution from here
+            Memory[0x5] = 0x202;
+
+            // set instruction in memory
+            Memory[0x202] = TransferControl.Encode(0x400);
+
+            // act
+            CPU.Execute();
+
+            // assert
+            Assert.AreEqual(0x203, Memory[0x2]); // test Q
+            Assert.AreEqual(0x400, Memory[0x5]); // test Z
+        }
+
+        [TestMethod]
+        public void TransferControl_Indirect()
+        {
+            // arrange
+            // TODO: setup A using instruction in future test
+            Memory[0x0] = 0x201; // set A to address for jump
+            Memory[0x5] = 0x400; // set Z
+
+            // act
+            RunInstruction(TransferControl.Encode(0x000)); // Execute Jump
+
+            // run one more cycle
+            CPU.Execute();
+
+            // assert
+            Assert.AreEqual(0x001, Memory[0x2]); // test Q
+            Assert.AreEqual(0x201, Memory[0x5]); // test Z
+        }
+    }
+}