Polish "Improve test coverage of StringUtils"

See gh-33298

spring-core/src/test/java/org/springframework/util/StringUtilsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -467,6 +467,18 @@ class StringUtilsTests {
 		assertThat(input[1]).isEqualTo("myString2");
 	}
 
+	@Test
+	void trimArrayElements() {
+		assertThat(StringUtils.trimArrayElements(null)).isNull();
+		assertThat(StringUtils.trimArrayElements(new String[] {})).isEmpty();
+		assertThat(StringUtils.trimArrayElements(new String[] { "", " ", "  ", "   " })).containsExactly("", "", "", "");
+		assertThat(StringUtils.trimArrayElements(new String[] { "\n", "\t ", "\n\t" })).containsExactly("", "", "");
+		assertThat(StringUtils.trimArrayElements(new String[] { "a", "b", "c" })).containsExactly("a", "b", "c");
+		assertThat(StringUtils.trimArrayElements(new String[] { "  a  ", "  b b ", "  cc  " })).containsExactly("a", "b b", "cc");
+		assertThat(StringUtils.trimArrayElements(new String[] { "  a  ", "b", "  c  " })).containsExactly("a", "b", "c");
+		assertThat(StringUtils.trimArrayElements(new String[] { null, "  a  ", null })).containsExactly(null, "a", null);
+	}
+
 	@Test
 	void removeDuplicateStrings() {
 		String[] input = new String[] {"myString2", "myString1", "myString2"};
@@ -558,6 +570,18 @@ class StringUtilsTests {
 		assertThat(sa[0]).isEqualTo("a,b");
 	}
 
+	@Test
+	void delimitedListToStringArrayWithCharacterToDelete() {
+		String[] sa = StringUtils.delimitedListToStringArray("a,b,c", ",", "a");
+		assertThat(sa).containsExactly("", "b", "c");
+	}
+
+	@Test
+	void delimitedListToStringArrayWithCharacterToDeleteEqualsToDelimiter() {
+		String[] sa = StringUtils.delimitedListToStringArray("a,b,c", ",", ",");
+		assertThat(sa).containsExactly("a", "b", "c");
+	}
+
 	@Test
 	void commaDelimitedListToStringArrayMatchWords() {
 		// Could read these from files
@@ -783,29 +807,4 @@ class StringUtilsTests {
 		assertThat(StringUtils.truncate(text, 10)).isEqualTo(truncated);
 	}
 
-	@Test
-	void trimArrayElements() {
-		assertThat(StringUtils.trimArrayElements(null)).isNull();
-		assertThat(StringUtils.trimArrayElements(new String[]{})).isEmpty();
-		assertThat(StringUtils.trimArrayElements(new String[]{"", " ", "  ", "   "})).containsExactly("", "", "", "");
-		assertThat(StringUtils.trimArrayElements(new String[]{"\n", "\t ", "\n\t"})).containsExactly("", "", "");
-		assertThat(StringUtils.trimArrayElements(new String[]{"a", "b", "c"})).containsExactly("a", "b", "c");
-		assertThat(StringUtils.trimArrayElements(new String[]{"  a  ", "  b b ", "  cc  "})).containsExactly("a", "b b", "cc");
-		assertThat(StringUtils.trimArrayElements(new String[]{"  a  ", "b", "  c  "})).containsExactly("a", "b", "c");
-		assertThat(StringUtils.trimArrayElements(new String[]{null, "  a  ", null})).containsExactly(null, "a", null);
-	}
-
-	@Test
-	void delimitedListToStringArray() {
-		assertThat(StringUtils.delimitedListToStringArray(null, ",", null)).isEmpty();
-		assertThat(StringUtils.delimitedListToStringArray("a,b,c", null, null)).containsExactly("a,b,c");
-		assertThat(StringUtils.delimitedListToStringArray("abc", "", null)).containsExactly("a", "b", "c");
-		assertThat(StringUtils.delimitedListToStringArray("a,b,c", ",", null)).containsExactly("a", "b", "c");
-		assertThat(StringUtils.delimitedListToStringArray("a,b,c", ",", "a")).containsExactly("", "b", "c");
-		assertThat(StringUtils.delimitedListToStringArray("a,b,c,", ",", null)).containsExactly("a", "b", "c", "");
-		assertThat(StringUtils.delimitedListToStringArray(",a,b,c", ",", null)).containsExactly("", "a", "b", "c");
-		assertThat(StringUtils.delimitedListToStringArray("abc", ",", null)).containsExactly("abc");
-		assertThat(StringUtils.delimitedListToStringArray("a,b,c", ",", ",")).containsExactly("a", "b", "c");
-		assertThat(StringUtils.delimitedListToStringArray("a,,b,,c", ",,", null)).containsExactly("a", "b", "c");
-	}
 }