chore: add more tests (#2866)

* chore: add more tests

* chore: add more tests

* chore: fix test failure

core/stringx/replacer_test.go

@@ -60,6 +60,22 @@ func TestReplacer_ReplaceLongestMatching(t *testing.T) {
 	assert.Equal(t, "东京在japan", replacer.Replace("日本的首都在日本"))
 }
 
+func TestReplacer_ReplaceLongestOverlap(t *testing.T) {
+	keywords := map[string]string{
+		"456":  "def",
+		"abcd": "1234",
+	}
+	replacer := NewReplacer(keywords)
+	assert.Equal(t, "123def7", replacer.Replace("abcd567"))
+}
+
+func TestReplacer_ReplaceLongestLonger(t *testing.T) {
+	mapping := map[string]string{
+		"c": "3",
+	}
+	assert.Equal(t, "3d", NewReplacer(mapping).Replace("cd"))
+}
+
 func TestReplacer_ReplaceJumpToFail(t *testing.T) {
 	mapping := map[string]string{
 		"bcdf": "1235",