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Iterable to Collection unit test
//src: https://github.com/Doha2012/tutorials/blob/be171f7f59cad31d406c9e44da5aee4a185457cf/java-collections-conversions/src/test/java/org/baeldung/java/collections/IterableToCollectionUnitTest.java
import static org.hamcrest.Matchers.contains;
import static org.junit.Assert.assertThat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import org.apache.commons.collections4.IterableUtils;
import org.apache.commons.collections4.IteratorUtils;
import org.junit.Test;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
public class IterableToCollectionUnitTest {
Iterable<String> iterable = Arrays.asList("john", "tom", "jane");
Iterator<String> iterator = iterable.iterator();
@Test
public void whenConvertIterableToListUsingJava_thenSuccess() {
List<String> result = new ArrayList<String>();
for (String str : iterable) {
result.add(str);
}
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIterableToListUsingJava8_thenSuccess() {
List<String> result = new ArrayList<String>();
iterable.forEach(result::add);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIterableToListUsingJava8WithSpliterator_thenSuccess() {
List<String> result = StreamSupport.stream(iterable.spliterator(), false)
.collect(Collectors.toList());
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIterableToListUsingGuava_thenSuccess() {
List<String> result = Lists.newArrayList(iterable);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIterableToImmutableListUsingGuava_thenSuccess() {
List<String> result = ImmutableList.copyOf(iterable);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIterableToListUsingApacheCommons_thenSuccess() {
List<String> result = IterableUtils.toList(iterable);
assertThat(result, contains("john", "tom", "jane"));
}
// ======================== Iterator
@Test
public void whenConvertIteratorToListUsingJava_thenSuccess() {
List<String> result = new ArrayList<String>();
while (iterator.hasNext()) {
result.add(iterator.next());
}
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIteratorToListUsingJava8_thenSuccess() {
List<String> result = new ArrayList<String>();
iterator.forEachRemaining(result::add);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIteratorToListUsingJava8WithSpliterator_thenSuccess() {
List<String> result = StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, Spliterator.ORDERED), false)
.collect(Collectors.toList());
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIteratorToListUsingGuava_thenSuccess() {
List<String> result = Lists.newArrayList(iterator);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIteratorToImmutableListUsingGuava_thenSuccess() {
List<String> result = ImmutableList.copyOf(iterator);
assertThat(result, contains("john", "tom", "jane"));
}
@Test
public void whenConvertIteratorToListUsingApacheCommons_thenSuccess() {
List<String> result = IteratorUtils.toList(iterator);
assertThat(result, contains("john", "tom", "jane"));
}
}
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