1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.java.util.function;
18
19import junit.framework.TestCase;
20
21import java.util.Comparator;
22import java.util.function.BinaryOperator;
23
24public class BinaryOperatorTest extends TestCase {
25
26  public void testMinBy() throws Exception {
27    Comparator<String> stringComparator = String::compareTo;
28    assertEquals("a", BinaryOperator.minBy(stringComparator).apply("a", "b"));
29  }
30
31  public void testMinBy_null() throws Exception {
32    try {
33      BinaryOperator.minBy(null);
34      fail();
35    } catch (NullPointerException expected) {}
36  }
37
38  public void testMaxBy() throws Exception {
39    Comparator<String> stringComparator = String::compareTo;
40    assertEquals("b", BinaryOperator.maxBy(stringComparator).apply("a", "b"));
41  }
42
43  public void testMaxBy_null() throws Exception {
44    try {
45      BinaryOperator.maxBy(null);
46      fail();
47    } catch (NullPointerException expected) {}
48  }
49}
50