From f1827cb1f94b365f31531002a6bf1aa43c51fe9e Mon Sep 17 00:00:00 2001
From: hyeonisism <54709431+hyeonisism@users.noreply.github.com>
Date: Wed, 15 Jan 2020 01:20:38 +0900
Subject: [PATCH] Add tests for StringUtils split() method

Closes gh-24351
---
 .../springframework/util/StringUtilsTests.java   | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/spring-core/src/test/java/org/springframework/util/StringUtilsTests.java b/spring-core/src/test/java/org/springframework/util/StringUtilsTests.java
index 701eee3f96..e1f3ecef57 100644
--- a/spring-core/src/test/java/org/springframework/util/StringUtilsTests.java
+++ b/spring-core/src/test/java/org/springframework/util/StringUtilsTests.java
@@ -745,4 +745,20 @@ class StringUtilsTests {
 		assertThat(StringUtils.parseLocale("")).isNull();
 	}
 
+	@Test
+	void split() {
+		assertThat(StringUtils.split("Hello, world", ",")).isEqualTo(new String[]{"Hello", " world"});
+		assertThat(StringUtils.split(",Hello world", ",")).isEqualTo(new String[]{"", "Hello world"});
+		assertThat(StringUtils.split("Hello world,", ",")).isEqualTo(new String[]{"Hello world", ""});
+		assertThat(StringUtils.split("Hello, world,", ",")).isEqualTo(new String[]{"Hello", " world,"});
+	}
+
+	@Test
+	void splitWithEmptyString() {
+		assertThat(StringUtils.split("Hello, world", "")).isNull();
+		assertThat(StringUtils.split("", ",")).isNull();
+		assertThat(StringUtils.split(null, ",")).isNull();
+		assertThat(StringUtils.split("Hello, world", null)).isNull();
+		assertThat(StringUtils.split(null, null)).isNull();
+	}
 }