small string split join optimization

internal/utils/strutils/split_join_test.go

@@ -0,0 +1,38 @@
+package strutils_test
+
+import (
+	"strings"
+	"testing"
+
+	. "github.com/yusing/go-proxy/internal/utils/strutils"
+	. "github.com/yusing/go-proxy/internal/utils/testing"
+)
+
+var alphaNumeric = func() string {
+	var s strings.Builder
+	for i := range 'z' - 'a' + 1 {
+		s.WriteRune('a' + i)
+		s.WriteRune('A' + i)
+		s.WriteRune(',')
+	}
+	for i := range '9' - '0' + 1 {
+		s.WriteRune('0' + i)
+		s.WriteRune(',')
+	}
+	return s.String()
+}()
+
+func TestSplit(t *testing.T) {
+	tests := map[string]rune{
+		"":  0,
+		"1": '1',
+		",": ',',
+	}
+	for sep, rsep := range tests {
+		t.Run(sep, func(t *testing.T) {
+			expected := strings.Split(alphaNumeric, sep)
+			ExpectDeepEqual(t, SplitRune(alphaNumeric, rsep), expected)
+			ExpectEqual(t, JoinRune(expected, rsep), alphaNumeric)
+		})
+	}
+}