1 files changed, 54 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/vfs/ModifiedFileSetTest.java b/src/test/java/com/google/devtools/build/lib/vfs/ModifiedFileSetTest.java
new file mode 100644
index 0000000000..96001dfa2f
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/vfs/ModifiedFileSetTest.java
@@ -0,0 +1,54 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.google.devtools.build.lib.vfs;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.testing.EqualsTester;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * Tests for {@link ModifiedFileSet}.
+ */
+@RunWith(JUnit4.class)
+public class ModifiedFileSetTest {
+
+  @Test
+  public void testHashCodeAndEqualsContract() throws Exception {
+    PathFragment fragA = new PathFragment("a");
+    PathFragment fragB = new PathFragment("b");
+
+    ModifiedFileSet empty1 = ModifiedFileSet.NOTHING_MODIFIED;
+    ModifiedFileSet empty2 = ModifiedFileSet.builder().build();
+    ModifiedFileSet empty3 = ModifiedFileSet.builder().modifyAll(
+        ImmutableList.<PathFragment>of()).build();
+
+    ModifiedFileSet nonEmpty1 = ModifiedFileSet.builder().modifyAll(
+        ImmutableList.of(fragA, fragB)).build();
+    ModifiedFileSet nonEmpty2 = ModifiedFileSet.builder().modifyAll(
+        ImmutableList.of(fragB, fragA)).build();
+    ModifiedFileSet nonEmpty3 = ModifiedFileSet.builder().modify(fragA).modify(fragB).build();
+    ModifiedFileSet nonEmpty4 = ModifiedFileSet.builder().modify(fragB).modify(fragA).build();
+
+    ModifiedFileSet everythingModified = ModifiedFileSet.EVERYTHING_MODIFIED;
+
+    new EqualsTester()
+        .addEqualityGroup(empty1, empty2, empty3)
+        .addEqualityGroup(nonEmpty1, nonEmpty2, nonEmpty3, nonEmpty4)
+        .addEqualityGroup(everythingModified)
+        .testEquals();
+  }
+}