refactor: update TestBetweenSeconds and ExampleBetweenSeconds

datetime/datetime.go

@@ -231,6 +231,8 @@ func IsLeapYear(year int) bool {
 	return year%4 == 0 && (year%100 != 0 || year%400 == 0)
 }
 
+// BetweenSeconds returns the number of seconds between two times.
+// Play: todo
 func BetweenSeconds(t1 time.Time, t2 time.Time) int64 {
 	index := t2.Unix() - t1.Unix()
 	return index

datetime/datetime_example_test.go

@@ -355,14 +355,15 @@ func ExampleIsLeapYear() {
 }
 
 func ExampleBetweenSeconds() {
-	now := time.Now()
-	target := AddDay(now, 1)
+	today := time.Now()
+	tomorrow := AddDay(today, 1)
+	yesterday := AddDay(today, -1)
 
-	now1 := time.Now()
-	target1 := AddDay(now, -1)
+	result1 := BetweenSeconds(today, tomorrow)
+	result2 := BetweenSeconds(today, yesterday)
 
-	fmt.Println(BetweenSeconds(now, target))
-	fmt.Println(BetweenSeconds(now1, target1))
+	fmt.Println(result1)
+	fmt.Println(result2)
 
 	// Output:
 	// 86400

datetime/datetime_test.go

@@ -1,7 +1,6 @@
 package datetime
 
 import (
-	"fmt"
 	"testing"
 	"time"
 
@@ -22,9 +21,17 @@ func TestAddYear(t *testing.T) {
 }
 
 func TestBetweenSeconds(t *testing.T) {
-	now := time.Now()
-	target := AddDay(now, 1)
-	fmt.Println(BetweenSeconds(now, target))
+	assert := internal.NewAssert(t, "TestBetweenSeconds")
+
+	today := time.Now()
+	tomorrow := AddDay(today, 1)
+	yesterday := AddDay(today, -1)
+
+	result1 := BetweenSeconds(today, tomorrow)
+	result2 := BetweenSeconds(today, yesterday)
+
+	assert.Equal(int64(86400), result1)
+	assert.Equal(int64(-86400), result2)
 }
 
 func TestAddDay(t *testing.T) {