Open source some skylark tests.

--
MOS_MIGRATED_REVID=103652672
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 dfcbfcd..b94cf17 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
@@ -44,6 +44,11 @@
   public static final String RUNFILES_PREFIX = "DOES-NOT-WORK-YET";
 
   /**
+   * Default workspace name.
+   */
+  public static final String WORKSPACE_NAME = "";
+
+  /**
    * Name of a class with an INSTANCE field of type AnalysisMock to be used for analysis tests.
    */
   public static final String TEST_ANALYSIS_MOCK =