1 files changed, 49 insertions, 0 deletions
diff --git a/junit4/src/test/java/org/junit/tests/manipulation/FilterTest.java b/junit4/src/test/java/org/junit/tests/manipulation/FilterTest.java
new file mode 100644
index 0000000..242e990
--- /dev/null
+++ b/junit4/src/test/java/org/junit/tests/manipulation/FilterTest.java
@@ -0,0 +1,49 @@
+package org.junit.tests.manipulation;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertSame;
+import org.junit.Test;
+import org.junit.runner.Description;
+import org.junit.runner.manipulation.Filter;
+
+public class FilterTest {
+	public static class NamedFilter extends Filter {
+		private final String fName;
+
+		public NamedFilter(String name) {
+			fName= name;
+		}
+
+		@Override
+		public boolean shouldRun(Description description) {
+			return false;
+		}
+
+		@Override
+		public String describe() {
+			return fName;
+		}
+	}
+
+	@Test
+	public void intersectionText() {
+		NamedFilter a= new NamedFilter("a");
+		NamedFilter b= new NamedFilter("b");
+		assertEquals("a and b", a.intersect(b).describe());
+		assertEquals("b and a", b.intersect(a).describe());
+	}
+	
+	@Test
+	public void intersectSelf() {
+		NamedFilter a= new NamedFilter("a");
+		assertSame(a, a.intersect(a));
+	}
+	
+	@Test
+	public void intersectAll() {
+		NamedFilter a= new NamedFilter("a");
+		assertSame(a, a.intersect(Filter.ALL));
+		assertSame(a, Filter.ALL.intersect(a));
+		assertSame(Filter.ALL, Filter.ALL.intersect(Filter.ALL));
+	}
+}