setup getters and setters for combined registers

cpu/cpu_test.go

@@ -0,0 +1,46 @@
+package cpu
+
+import (
+	"testing"
+)
+
+func TestCPUAF(t *testing.T) {
+	cpu := CPU_struct{}
+	cpu.A = 0x0A
+	cpu.F = 0x0B
+
+	expected := uint16(0x0A0B)
+	actual := cpu.AF()
+
+	if actual != expected {
+		t.Errorf("actual %x != expected %x", actual, expected)
+	}
+}
+
+func TestCPU_struct_SetAF(t *testing.T) {
+	cpu := CPU_struct{}
+	cpu.SetAF(0xABCD)
+
+	expectedA := uint8(0xAB)
+	expectedF := uint8(0xCD)
+	actualA := cpu.A
+	actualF := cpu.F
+	if actualA != expectedA {
+		t.Errorf("actual %x != expected %x", actualA, expectedA)
+	}
+	if actualF != expectedF {
+		t.Errorf("actual %x != expected %x", actualF, expectedF)
+	}
+}
+
+func TestCPU_struct_GetAndSetAF(t *testing.T) {
+	cpu := CPU_struct{}
+	cpu.SetAF(0xABCD)
+
+	expectedAF := uint16(0xABCD)
+	actualAF := cpu.AF()
+
+	if actualAF != expectedAF {
+		t.Errorf("actual %x != expected %x", actualAF, expectedAF)
+	}
+}