From f0fbbd2ff2e0743ab67d9dec8997ebada9a42f27 Mon Sep 17 00:00:00 2001
From: ridwanfathin <m.ridwanfathin@gmail.com>
Date: Mon, 12 Oct 2020 09:10:44 +0700
Subject: [PATCH] Add verify swap using pointers

---
 numerical/swap.go      | 15 +++++++++++++++
 numerical/swap_test.go | 19 +++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 numerical/swap.go
 create mode 100644 numerical/swap_test.go

diff --git a/numerical/swap.go b/numerical/swap.go
new file mode 100644
index 0000000..fbf633f
--- /dev/null
+++ b/numerical/swap.go
@@ -0,0 +1,15 @@
+package numerical
+
+import "fmt"
+
+func swap(x, y *int) {
+	*x, *y = *y, *x
+}
+
+func main() {
+	x := 3
+	y := 2
+	fmt.Println(x, y)
+	swap(&x, &y)
+	fmt.Println(x, y)
+}
diff --git a/numerical/swap_test.go b/numerical/swap_test.go
new file mode 100644
index 0000000..744d416
--- /dev/null
+++ b/numerical/swap_test.go
@@ -0,0 +1,19 @@
+package numerical
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSwap(t *testing.T) {
+	x := 5
+	y := 6
+
+	expectedX := 6
+	expectedY := 5
+
+	swap(&x, &y)
+	assert.Equal(t, x, expectedX, "value should be equal")
+	assert.Equal(t, y, expectedY, "value should be equal")
+}