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Consistently declare nullability @⁠Contract for core utilities

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Closes gh-34934
This commit is contained in:
Sam Brannen
2025-06-07 11:41:38 +02:00
parent 9505e768ae
commit 315bbf3abe
12 changed files with 81 additions and 17 deletions
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spring-core/src/test/java/org/springframework/util/CollectionUtilsTests.java
+14 -12
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@@ -180,27 +180,29 @@ class CollectionUtilsTests {
@Test
void findValueOfType() {
List<Integer> integerList = new ArrayList<>();
integerList.add(1);
assertThat(CollectionUtils.findValueOfType(integerList, Integer.class)).isEqualTo(1);
assertThat(CollectionUtils.findValueOfType(List.of(1), Integer.class)).isEqualTo(1);
Set<Integer> integerSet = new HashSet<>();
integerSet.add(2);
assertThat(CollectionUtils.findValueOfType(integerSet, Integer.class)).isEqualTo(2);
assertThat(CollectionUtils.findValueOfType(Set.of(2), Integer.class)).isEqualTo(2);
}
@Test
void findValueOfTypeWithNullType() {
assertThat(CollectionUtils.findValueOfType(List.of(1), (Class<?>) null)).isEqualTo(1);
}
@Test
void findValueOfTypeWithNullCollection() {
assertThat(CollectionUtils.findValueOfType(null, Integer.class)).isNull();
}
@Test
void findValueOfTypeWithEmptyCollection() {
List<Integer> emptyList = new ArrayList<>();
assertThat(CollectionUtils.findValueOfType(emptyList, Integer.class)).isNull();
assertThat(CollectionUtils.findValueOfType(List.of(), Integer.class)).isNull();
}
@Test
void findValueOfTypeWithMoreThanOneValue() {
List<Integer> integerList = new ArrayList<>();
integerList.add(1);
integerList.add(2);
assertThat(CollectionUtils.findValueOfType(integerList, Integer.class)).isNull();
assertThat(CollectionUtils.findValueOfType(List.of(1, 2), Integer.class)).isNull();
}
@Test