1 files changed, 54 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/packages/ProtoUtilsTest.java b/src/test/java/com/google/devtools/build/lib/packages/ProtoUtilsTest.java
new file mode 100644
index 0000000000..a18d662c58
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/packages/ProtoUtilsTest.java
@@ -0,0 +1,54 @@
+// 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.packages;
+
+import static org.junit.Assert.assertTrue;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import com.google.devtools.build.lib.query2.proto.proto2api.Build.Attribute.Discriminator;
+import com.google.devtools.build.lib.syntax.Type;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.util.Collection;
+import java.util.Map.Entry;
+
+/** Tests for values and functions in ProtoUtils. */
+@RunWith(JUnit4.class)
+public class ProtoUtilsTest {
+
+  @Test
+  public void testTypeMap() throws Exception {
+    // The ProtoUtils TYPE_MAP (and its inverse, INVERSE_TYPE_MAP) are used to translate between
+    // rule attribute types and Discriminator values used to encode them in GPB messages. For each
+    // discriminator value there must be exactly one type, or there must be exactly two types, one
+    // which is a nodep type and the other which is not.
+    ImmutableSet<Entry<Discriminator, Collection<Type<?>>>> inverseMapEntries =
+        ProtoUtils.INVERSE_TYPE_MAP.asMap().entrySet();
+    for (Entry<Discriminator, Collection<Type<?>>> entry : inverseMapEntries) {
+      ImmutableSet<Type<?>> types = ImmutableSet.copyOf(entry.getValue());
+      String assertionMessage =
+          String.format(
+              "Cannot map from discriminator \"%s\" to exactly one Type.",
+              entry.getKey().toString());
+      boolean exactlyOneType = types.size() == 1;
+      boolean twoTypesDistinguishableUsingNodepHint =
+          types.size() == 2 && Sets.difference(types, ProtoUtils.NODEP_TYPES).size() == 1;
+      assertTrue(assertionMessage, exactlyOneType || twoTypesDistinguishableUsingNodepHint);
+    }
+  }
+}