Make it easier to reuse empty PrepareDepsOfTargetsUnderDirectoryValue singletons

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MOS_MIGRATED_REVID=107719658

1 files changed, 42 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/PrepareDepsOfTargetsUnderDirectoryValueTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/PrepareDepsOfTargetsUnderDirectoryValueTest.java
new file mode 100644
index 0000000000..b25ef6cdae
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/PrepareDepsOfTargetsUnderDirectoryValueTest.java
@@ -0,0 +1,42 @@
+// Copyright 2015 The Bazel Authors. 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.skyframe;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.devtools.build.lib.vfs.RootedPath;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Sanity checks for {@link PrepareDepsOfTargetsUnderDirectoryValue}. */
+@RunWith(JUnit4.class)
+public class PrepareDepsOfTargetsUnderDirectoryValueTest {
+
+  @Test
+  public void testOfMatchingEmptyValueReturnsEmptySingleton() {
+    PrepareDepsOfTargetsUnderDirectoryValue val =
+        PrepareDepsOfTargetsUnderDirectoryValue.of(false, ImmutableMap.<RootedPath, Boolean>of());
+    assertThat(val).isSameAs(PrepareDepsOfTargetsUnderDirectoryValue.EMPTY);
+  }
+
+  @Test
+  public void testOfMatchingEmptyDirectoryPackageReturnsSingleton() {
+    PrepareDepsOfTargetsUnderDirectoryValue val =
+        PrepareDepsOfTargetsUnderDirectoryValue.of(true, ImmutableMap.<RootedPath, Boolean>of());
+    assertThat(val).isSameAs(PrepareDepsOfTargetsUnderDirectoryValue.EMPTY_DIRECTORY_PACKAGE);
+  }
+}