1 files changed, 28 insertions, 0 deletions
diff --git a/Q1.tests/Core/InstructionEncodingTests.cs b/Q1.tests/Core/InstructionEncodingTests.cs
new file mode 100644
index 0000000..7bb653f
--- /dev/null
+++ b/Q1.tests/Core/InstructionEncodingTests.cs
@@ -0,0 +1,28 @@
+namespace Q1.tests.Core;
+
+using core.Arch;
+
+[TestFixture]
+public class InstructionEncodingTests
+{
+    [Test]
+    public void EncodeDecode_ShouldRoundTrip()
+    {
+        u8 opcode = 0x01;
+        u8 m1 = 0x5;
+        u8 m2 = 0xC;
+        bool word = true;
+
+        u16 instruction = InstructionEncoding.Encode(opcode, m1, m2, word);
+
+        InstructionEncoding.Decode(instruction, out var op2, out var m1_2, out var m2_2, out var word2);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(op2, Is.EqualTo(opcode));
+            Assert.That(m1_2, Is.EqualTo(m1));
+            Assert.That(m2_2, Is.EqualTo(m2));
+            Assert.That(word2, Is.EqualTo(word));
+        });
+    }
+}
+\ No newline at end of file