/*
* Copyright 2014 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.netflix.servo.util;
import org.testng.annotations.Test;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
public class StringsTest {
@Test
public void testIsNullOrEmpty() throws Exception {
assertTrue(Strings.isNullOrEmpty(null));
assertTrue(Strings.isNullOrEmpty(""));
assertFalse(Strings.isNullOrEmpty(" "));
assertFalse(Strings.isNullOrEmpty("adsf"));
}
private static <T> Iterator<T> emptyIterator() {
return new Iterator<T>() {
@Override
public boolean hasNext() {
return false;
}
@Override
public T next() {
throw new NoSuchElementException();
}
@Override
public void remove() {
throw new IllegalStateException();
}
};
}
@Test
public void testJoin() throws Exception {
assertEquals(Strings.join(", ", emptyIterator()), "");
assertEquals(Strings.join(", ", Collections.singletonList(1).iterator()), "1");
assertEquals(Strings.join(", ", Arrays.asList(1, 2).iterator()), "1, 2");
}
}