started op table

cpu/operations/dec_test.go

@@ -0,0 +1,37 @@
+package operations
+
+import "testing"
+
+func TestDEC(t *testing.T) {
+	r1 := byte(3)
+	DEC(&r1)
+
+	expected := byte(2)
+	actual := r1
+
+	if actual != expected {
+		t.Errorf("actual %x != expected %x", actual, expected)
+	}
+}
+
+func TestDEC16(t *testing.T) {
+	r1 := byte(0xAB)
+	r2 := byte(0x11)
+	DEC16(&r1, &r2)
+
+	expected := uint16(0xAB10)
+	actual := (uint16(r1) << 8) | uint16(r2)
+	if actual != expected {
+		t.Errorf("actual %x != expected %x", actual, expected)
+	}
+
+	r1 = byte(0x11)
+	r2 = byte(0x00)
+	DEC16(&r1, &r2)
+
+	expected = uint16(0x1000)
+	actual = (uint16(r1) << 8) | uint16(r2)
+	if actual != expected {
+		t.Errorf("actual %x != expected %x", actual, expected)
+	}
+}