First OpCode Decoding attempt

ParsonsMegadrive.Tests/CpuTests.cs

@@ -0,0 +1,34 @@
+using ParsonsMegaDrive.Core;
+using ParsonsMegaDrive.Core.Memory;
+using Xunit;
+
+namespace ParsonsMegaDrive.Tests
+{
+    public class CpuTests
+    {
+        [Fact]
+        public void MoveQ_ShouldLoadDataAndSetFlags()
+        {
+            // 1. Arrange: Boot the machine
+            var bus = new MdMemoryBus();
+            var cpu = new M68000(bus);
+
+            // 2. Load the opcode for "MOVEQ #5, D1" (0x7205) into memory at PC 0
+            bus.Write16(0x000000, 0x7205);
+
+            // 3. Act: Step the CPU exactly once
+            int cycles = cpu.Step();
+
+            // 4. Assert: Did it work?
+            Assert.Equal(4, cycles);                    // Should take exactly 4 cycles
+            Assert.Equal(2u, cpu.PC);                   // PC should advance by 2 bytes
+            Assert.Equal(5u, cpu.D[1]);                 // D1 should now contain the number 5
+
+            // Assert Flags (5 is greater than 0, so Z and N should be false)
+            Assert.False(cpu.FlagZ);
+            Assert.False(cpu.FlagN);
+            Assert.False(cpu.FlagV);
+            Assert.False(cpu.FlagC);
+        }
+    }
+}

ParsonsMegadrive.Tests/UnitTest1.cs

@@ -1,11 +0,0 @@
-namespace ParsonsMegadrive.Tests
-{
-    public class UnitTest1
-    {
-        [Fact]
-        public void Test1()
-        {
-
-        }
-    }
-}