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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.server.jetty;
import org.testng.annotations.Test;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.greaterThan;
/**
* @author bakksjo
*/
public class AlternativeTest {
private static final String MAN = "man";
private static final String BEAR = "bear";
private static final String PIG = "pig";
@Test
public void singleValue() {
assertThat(
Alternative.preferred(MAN)
.orElseGet(() -> BEAR),
is(MAN));
}
@Test
public void singleNull() {
assertThat(
Alternative.preferred(null)
.orElseGet(() -> BEAR),
is(BEAR));
}
@Test
public void twoValues() {
assertThat(
Alternative.preferred(MAN)
.alternatively(() -> BEAR)
.orElseGet(() -> PIG),
is(MAN));
}
@Test
public void oneNullOneValue() {
assertThat(
Alternative.preferred(null)
.alternatively(() -> MAN)
.orElseGet(() -> BEAR),
is(MAN));
}
@Test
public void twoNulls() {
assertThat(
Alternative.preferred(null)
.alternatively(() -> null)
.orElseGet(() -> MAN),
is(MAN));
}
@Test
public void singleNullLastResortIsNull() {
assertThat(
Alternative.preferred(null)
.orElseGet(() -> null),
is(nullValue()));
}
@Test
public void twoNullsLastResortIsNull() {
assertThat(
Alternative.preferred(null)
.alternatively(() -> null)
.orElseGet(() -> null),
is(nullValue()));
}
@Test
public void oneNullTwoValues() {
assertThat(
Alternative.preferred(null)
.alternatively(() -> MAN)
.alternatively(() -> BEAR)
.orElseGet(() -> PIG),
is(MAN));
}
@Test
public void equalValuesMakeEqualAlternatives() {
assertThat(Alternative.preferred(MAN), is(equalTo(Alternative.preferred(MAN))));
assertThat(Alternative.preferred(BEAR), is(equalTo(Alternative.preferred(BEAR))));
assertThat(Alternative.preferred(PIG), is(equalTo(Alternative.preferred(PIG))));
assertThat(Alternative.preferred(null), is(equalTo(Alternative.preferred(null))));
}
@Test
public void equalValuesMakeEqualHashCodes() {
assertThat(Alternative.preferred(MAN).hashCode(), is(equalTo(Alternative.preferred(MAN).hashCode())));
assertThat(Alternative.preferred(BEAR).hashCode(), is(equalTo(Alternative.preferred(BEAR).hashCode())));
assertThat(Alternative.preferred(PIG).hashCode(), is(equalTo(Alternative.preferred(PIG).hashCode())));
assertThat(Alternative.preferred(null).hashCode(), is(equalTo(Alternative.preferred(null).hashCode())));
}
@Test
public void unequalValuesMakeUnequalAlternatives() {
assertThat(Alternative.preferred(MAN), is(not(equalTo(Alternative.preferred(BEAR)))));
assertThat(Alternative.preferred(MAN), is(not(equalTo(Alternative.preferred(PIG)))));
assertThat(Alternative.preferred(MAN), is(not(equalTo(Alternative.preferred(null)))));
assertThat(Alternative.preferred(BEAR), is(not(equalTo(Alternative.preferred(MAN)))));
assertThat(Alternative.preferred(BEAR), is(not(equalTo(Alternative.preferred(PIG)))));
assertThat(Alternative.preferred(BEAR), is(not(equalTo(Alternative.preferred(null)))));
assertThat(Alternative.preferred(PIG), is(not(equalTo(Alternative.preferred(MAN)))));
assertThat(Alternative.preferred(PIG), is(not(equalTo(Alternative.preferred(BEAR)))));
assertThat(Alternative.preferred(PIG), is(not(equalTo(Alternative.preferred(null)))));
assertThat(Alternative.preferred(null), is(not(equalTo(Alternative.preferred(MAN)))));
assertThat(Alternative.preferred(null), is(not(equalTo(Alternative.preferred(BEAR)))));
assertThat(Alternative.preferred(null), is(not(equalTo(Alternative.preferred(PIG)))));
}
@Test
public void hashValuesAreDecent() {
final String[] animals = { MAN, BEAR, PIG, "squirrel", "aardvark", "porcupine", "sasquatch", null };
final Set<Integer> hashCodes = Stream.of(animals)
.map(Alternative::preferred)
.map(Alternative::hashCode)
.collect(Collectors.toSet());
assertThat(hashCodes.size(), is(greaterThan(animals.length / 2))); // A modest requirement.
}
}
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