1 package org.junit.tests.manipulation;
2
3 import static org.junit.Assert.assertEquals;
4 import static org.junit.Assert.assertSame;
5
6 import org.junit.Test;
7 import org.junit.runner.Description;
8 import org.junit.runner.manipulation.Filter;
9
10 public class FilterTest {
11 public static class NamedFilter extends Filter {
12 private final String fName;
13
14 public NamedFilter(String name) {
15 fName = name;
16 }
17
18 @Override
19 public boolean shouldRun(Description description) {
20 return false;
21 }
22
23 @Override
24 public String describe() {
25 return fName;
26 }
27 }
28
29 @Test
30 public void intersectionText() {
31 NamedFilter a = new NamedFilter("a");
32 NamedFilter b = new NamedFilter("b");
33 assertEquals("a and b", a.intersect(b).describe());
34 assertEquals("b and a", b.intersect(a).describe());
35 }
36
37 @Test
38 public void intersectSelf() {
39 NamedFilter a = new NamedFilter("a");
40 assertSame(a, a.intersect(a));
41 }
42
43 @Test
44 public void intersectAll() {
45 NamedFilter a = new NamedFilter("a");
46 assertSame(a, a.intersect(Filter.ALL));
47 assertSame(a, Filter.ALL.intersect(a));
48 assertSame(Filter.ALL, Filter.ALL.intersect(Filter.ALL));
49 }
50 }