Refactoring : isolate stack manipulation into their own package

pkg/stack/stack_test.go

@@ -0,0 +1,83 @@
+package stack
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestClear(t *testing.T) {
+	s := NewStack(32, nil)
+	s.Clear()
+	require.Equal(t, 0, s.height)
+}
+
+func TestDupicate(t *testing.T) {
+	expected := NewStack(32, nil)
+	expected.height = 2
+	s := NewStack(32, nil)
+	s.Duplicate()
+	require.Equal(t, expected.height, s.height)
+	s.Push(12)
+	s.Duplicate()
+	expected.Push(12)
+	expected.Push(12)
+	require.Equal(t, expected.height, s.height)
+	require.Equal(t, expected.data, s.data)
+}
+
+func TestPop(t *testing.T) {
+	s := NewStack(32, nil)
+	v := s.Pop()
+	require.Equal(t, 0, v)
+	s.Push(12)
+	s.Push(14)
+	v = s.Pop()
+	require.Equal(t, 14, v)
+	v = s.Pop()
+	require.Equal(t, 12, v)
+	v = s.Pop()
+	require.Equal(t, 0, v)
+}
+
+func TestPush(t *testing.T) {
+	s := NewStack(32, nil)
+	for i := 0; i < 32; i++ {
+		s.Push(i)
+	}
+	require.Equal(t, 32, s.size)
+	s.Push(-1)
+	require.Equal(t, 64, s.size)
+}
+
+func TestSwap(t *testing.T) {
+	s := NewStack(32, nil)
+	s2 := NewStack(32, nil)
+	s.Swap()
+	s2.Push(0)
+	s2.Push(0)
+	require.Equal(t, s2, s)
+	s.Clear()
+	s.Push(1)
+	s.Swap()
+	s2.Clear()
+	s2.Push(1)
+	s2.Push(0)
+	require.Equal(t, s2, s)
+	s.Clear()
+	s.Push(1)
+	s.Push(2)
+	s2.Clear()
+	s2.Push(2)
+	s2.Push(1)
+	s.Swap()
+	require.Equal(t, s2, s)
+}
+
+func TestHeights(t *testing.T) {
+	// TODO
+}
+
+func TestTransfert(t *testing.T) {
+	// TODO
+}