Resolve all errors

pkg/chunk/stack_test.go

@@ -0,0 +1,72 @@
+package chunk
+
+import "testing"
+
+func TestOOB(t *testing.T) {
+	stack := NewStack(1)
+
+	item := stack.Push(1)
+	stack.Touch(item)
+}
+
+func TestAddToStack(t *testing.T) {
+	stack := NewStack(1)
+
+	item1 := stack.Push(1)
+	item2 := stack.Push(2)
+	item3 := stack.Push(3)
+	item4 := stack.Push(4)
+
+	stack.Touch(item1)
+	stack.Touch(item3)
+
+	stack.Purge(item2)
+	stack.Purge(item4)
+
+	v := stack.Pop()
+	if v != 4 {
+		t.Fatalf("Expected 4 got %v", v)
+	}
+
+	v = stack.Pop()
+	if v != 2 {
+		t.Fatalf("Expected 2 got %v", v)
+	}
+
+	v = stack.Pop()
+	if v != 1 {
+		t.Fatalf("Expected 1 got %v", v)
+	}
+
+	v = stack.Pop()
+	if v != 3 {
+		t.Fatalf("Expected 3 got %v", v)
+	}
+
+	v = stack.Pop()
+	if v != -1 {
+		t.Fatalf("Expected -1 got %v", v)
+	}
+}
+
+func TestLen(t *testing.T) {
+	stack := NewStack(1)
+
+	v := stack.Len()
+	if v != 0 {
+		t.Fatalf("Expected 0 got %v", v)
+	}
+
+	stack.Push(1)
+	v = stack.Len()
+	if v != 1 {
+		t.Fatalf("Expected 1 got %v", v)
+	}
+
+	_ = stack.Pop()
+	v = stack.Len()
+	if v != 0 {
+		t.Fatalf("Expected 0 got %v", v)
+	}
+
+}