iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

BAEL-7885: Simple tests for addAll (#16504) 

* BAEL-7885: Simple tests for addAll

* BAEL-7885: Stream test example
This commit is contained in:
Eugene Kovko 2024-04-28 20:20:08 +02:00 committed by GitHub
parent 3240f5b820
commit ba73008ee9
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 98 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
core-java-modules/core-java-collections-array-list-2/pom.xml
View File

@ -12,6 +12,14 @@
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${apache.commons.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
@ -28,5 +36,6 @@
<properties>
<maven-compiler-plugin.source>17</maven-compiler-plugin.source>
<maven-compiler-plugin.target>17</maven-compiler-plugin.target>
<apache.commons.version>4.4</apache.commons.version>
</properties>
</project>

89
core-java-modules/core-java-collections-array-list-2/src/test/java/com/baeldung/addallnulls/AddAllWithNullsUnitTest.java Normal file
View File

@ -0,0 +1,89 @@
package com.baeldung.addallnulls;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
import static org.assertj.core.api.Assertions.assertThatNoException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;
import org.apache.commons.collections4.CollectionUtils;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import org.junit.jupiter.params.provider.NullSource;
class AddAllWithNullsUnitTest {
@ParameterizedTest
@NullSource
void givenNull_whenAddAll_thenAddThrowsNPE(List<String> list) {
ArrayList<String> strings = new ArrayList<>();
assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> strings.addAll(list));
}
@ParameterizedTest
@NullSource
void givenNull_whenAddAllWithCheck_thenNoNPE(List<String> list) {
ArrayList<String> strings = new ArrayList<>();
assertThatNoException().isThrownBy(() -> {
if (list != null) {
strings.addAll(list);
}
});
}
@ParameterizedTest
@NullSource
void givenNull_whenAddAllWithCollectionCheck_thenNoNPE(List<String> list) {
ArrayList<String> strings = new ArrayList<>();
assertThatNoException().isThrownBy(() -> {
strings.addAll(CollectionUtils.emptyIfNull(list));
});
}
@ParameterizedTest
@NullSource
void givenNull_whenAddAllWithExternalizedCheck_thenNoNPE(List<String> list) {
ArrayList<String> strings = new ArrayList<>();
assertThatNoException().isThrownBy(() -> {
addIfNonNull(list, strings);
});
}
private static void addIfNonNull(List<String> list, ArrayList<String> strings) {
if (list != null) {
strings.addAll(list);
}
}
@ParameterizedTest
@NullSource
void givenNull_whenAddAllWithOptional_thenNoNPE(List<String> list) {
ArrayList<String> strings = new ArrayList<>();
assertThatNoException().isThrownBy(() -> {
Optional.ofNullable(list).ifPresent(strings::addAll);
});
}
@ParameterizedTest
@MethodSource("listProvider")
void givenCollectionOfNullableLists_whenFilter_thenNoNPE(List<List<String>> listOfLists) {
ArrayList<String> strings = new ArrayList<>();
assertThatNoException().isThrownBy(() -> {
listOfLists.stream().filter(Objects::nonNull).forEach(strings::addAll);
});
}
static Stream<List<List<String>>> listProvider() {
ArrayList<List<String>> lists = new ArrayList<>();
lists.add(null);
lists.add(List.of("Hello"));
lists.add(null);
lists.add(List.of("World"));
lists.add(null);
return Stream.of(
lists
);
}
}