feat: add functions.

rand/rand_test.go

@@ -0,0 +1,17 @@
+package rand
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRandomInt(t *testing.T) {
+	for i := 0; i < 1000; i++ {
+		n := RandomInt(1, 100)
+		fmt.Println(n)
+		assert.True(t, n >= 1)
+		assert.True(t, n < 100)
+	}
+}