Open source loading the rules module

--
MOS_MIGRATED_REVID=110361527
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;