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SpliteratorTest.java
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128 lines (105 loc) · 3.73 KB
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import org.junit.Test;
import java.util.Comparator;
import java.util.List;
import java.util.TreeSet;
import static java.util.Spliterator.*;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.*;
/**
* Created by mtumilowicz on 2018-11-12.
*/
public class SpliteratorTest {
@Test
public void tryAdvance_nonEmpty() {
// given
var integers = List.of(1, 2, 3, 4);
var spliterator = integers.spliterator();
// expect
assertTrue(spliterator.tryAdvance(System.out::println));
}
@Test
public void tryAdvance_empty() {
// given
var integers = List.of();
var spliterator = integers.spliterator();
// expect
assertFalse(spliterator.tryAdvance(System.out::println));
}
@Test
public void forEachRemaining() {
// given
var integers = List.of(1, 2, 3, 4);
var spliterator = integers.spliterator();
// print all
spliterator.forEachRemaining(System.out::println);
}
@Test
public void trySplit() {
// given
var integers = List.of(1, 2, 3, 4, 5);
var spliterator = integers.spliterator();
var splitted = spliterator.trySplit();
// expect
assertThat(spliterator.getExactSizeIfKnown(), is(3L));
spliterator.forEachRemaining(System.out::println);
assertThat(spliterator.getExactSizeIfKnown(), is(0L));
System.out.println("---");
assertThat(splitted.getExactSizeIfKnown(), is(2L));
splitted.forEachRemaining(System.out::println);
assertThat(splitted.getExactSizeIfKnown(), is(0L));
}
@Test
public void estimateSize() {
// given
var integers = List.of(1, 2, 3, 4, 5);
var spliterator = integers.spliterator();
// expect
assertThat(spliterator.estimateSize(), is(5L));
}
@Test
public void getExactSizeIfKnown() {
// given
var integers = List.of(1, 2, 3, 4, 5);
var spliterator = integers.spliterator();
// expect
assertThat(spliterator.getExactSizeIfKnown(), is(5L));
}
@Test
public void list_hasCharacteristics() {
// given
var integers = List.of(1, 2, 3, 4, 5);
var spliterator = integers.spliterator();
// expect
assertTrue(spliterator.hasCharacteristics(ORDERED));
assertFalse(spliterator.hasCharacteristics(DISTINCT));
assertFalse(spliterator.hasCharacteristics(SORTED));
assertTrue(spliterator.hasCharacteristics(SIZED));
assertFalse(spliterator.hasCharacteristics(NONNULL));
assertFalse(spliterator.hasCharacteristics(IMMUTABLE));
assertFalse(spliterator.hasCharacteristics(CONCURRENT));
assertTrue(spliterator.hasCharacteristics(SUBSIZED));
}
@Test
public void treeSet_hasCharacteristics() {
// given
var integers = new TreeSet<Integer>();
var spliterator = integers.spliterator();
// expect
assertTrue(spliterator.hasCharacteristics(ORDERED));
assertTrue(spliterator.hasCharacteristics(DISTINCT));
assertTrue(spliterator.hasCharacteristics(SORTED));
assertTrue(spliterator.hasCharacteristics(SIZED));
assertFalse(spliterator.hasCharacteristics(NONNULL));
assertFalse(spliterator.hasCharacteristics(IMMUTABLE));
assertFalse(spliterator.hasCharacteristics(CONCURRENT));
assertFalse(spliterator.hasCharacteristics(SUBSIZED));
}
@Test
public void treeSet_getComparator() {
// given
var integers = new TreeSet<Integer>(Comparator.naturalOrder());
var spliterator = integers.spliterator();
// expect
assertThat(spliterator.getComparator(), is(Comparator.naturalOrder()));
}
}