Open source loading the rules module

--
MOS_MIGRATED_REVID=110361527
diff --git a/src/test/java/com/google/devtools/build/lib/buildtool/util/TestRuleModule.java b/src/test/java/com/google/devtools/build/lib/buildtool/util/TestRuleModule.java
new file mode 100644
index 0000000..58de368
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/buildtool/util/TestRuleModule.java
@@ -0,0 +1,32 @@
+// 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.buildtool.util;
+
+import com.google.devtools.build.lib.runtime.BlazeModule;
+import com.google.devtools.build.lib.testutil.TestConstants;
+
+/**
+ * Get the rule class module for tests.
+ */
+public class TestRuleModule {
+  public static BlazeModule getModule() {
+    try {
+      Class<?> moduleClass = Class.forName(TestConstants.TEST_RULE_MODULE);
+      return (BlazeModule) moduleClass.newInstance();
+    } catch (Exception e) {
+      throw new IllegalStateException(e);
+    }
+  }
+}
diff --git a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
index a2c073b..9278dd3 100644
--- a/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
+++ b/src/test/java/com/google/devtools/build/lib/testutil/TestConstants.java
@@ -61,6 +61,8 @@
 
   public static final String TEST_RULE_CLASS_PROVIDER =
       "com.google.devtools.build.lib.bazel.rules.BazelRuleClassProvider";
+  public static final String TEST_RULE_MODULE =
+        "com.google.devtools.build.lib.bazel.rules.BazelRulesModule";
   public static final ImmutableList<String> IGNORED_MESSAGE_PREFIXES = ImmutableList.<String>of();
 
   public static final boolean THIS_IS_BAZEL = true;