Add gmachine

gmachine/gmachine_test.go

@@ -0,0 +1,108 @@
+package gmachine_test
+
+import (
+	"gmachine"
+	"testing"
+)
+
+func TestNew(t *testing.T) {
+	t.Parallel()
+	g := gmachine.New()
+	wantMemSize := gmachine.DefaultMemSize
+	gotMemSize := len(g.Memory)
+	if wantMemSize != gotMemSize {
+		t.Errorf("want %d words of memory, got %d", wantMemSize, gotMemSize)
+	}
+	var wantP uint64 = 0
+	if wantP != g.P {
+		t.Errorf("want initial P value %d, got %d", wantP, g.P)
+	}
+	var wantMemValue uint64 = 0
+	gotMemValue := g.Memory[gmachine.DefaultMemSize-1]
+	if wantMemValue != gotMemValue {
+		t.Errorf("want last memory location to contain %d, got %d", wantMemValue, gotMemValue)
+	}
+	var wantRegisterA uint64 = 0
+	gotRegisterA := g.A
+	if wantRegisterA != gotRegisterA {
+		t.Errorf("want registerA with data %d, got %d", wantRegisterA, gotRegisterA)
+	}
+
+}
+
+func TestHalt(t *testing.T) {
+	t.Parallel()
+	var wants uint64 = 1
+
+	g := gmachine.New()
+	g.Run()
+	got := g.P
+
+	if wants != got {
+		t.Errorf("want P == %d, got %d", wants, got)
+	}
+}
+
+func TestNOOP(t *testing.T) {
+	t.Parallel()
+
+	var wants uint64 = 2
+
+	g := gmachine.New()
+	g.NewProgram([]uint64{
+		gmachine.OpNOOP,
+		gmachine.OpHALT,
+	})
+	got := g.P
+
+	if wants != got {
+		t.Errorf("want P == %d, got %d", wants, got)
+	}
+}
+
+func TestINCA(t *testing.T) {
+	t.Parallel()
+
+	var wants uint64 = 1
+
+	g := gmachine.New()
+	g.Memory[0] = gmachine.OpINCA
+	g.Run()
+	got := g.A
+
+	if wants != got {
+		t.Errorf("want A == %d, got %d", wants, got)
+	}
+}
+
+func TestDECA(t *testing.T) {
+	t.Parallel()
+
+	var wants uint64 = 1
+
+	g := gmachine.New()
+	g.A = 2
+	g.Memory[0] = gmachine.OpDECA
+	g.Run()
+	got := g.A
+
+	if wants != got {
+		t.Errorf("want A == %d, got %d", wants, got)
+	}
+}
+
+func TestSETA(t *testing.T) {
+	t.Parallel()
+
+	var wants uint64 = 3
+
+	g := gmachine.New()
+	g.Memory[0] = gmachine.OpSETA
+	g.Memory[1] = wants
+	g.Run()
+	got := g.A
+
+	if wants != got {
+		t.Errorf("want A == %d, got %d", wants, got)
+	}
+}