1 files changed, 19 insertions, 1 deletions
diff --git a/src/test/java/com/google/devtools/build/skyframe/GraphTester.java b/src/test/java/com/google/devtools/build/skyframe/GraphTester.java
index 2d44e9ddc5..2a3fc1b4af 100644
--- a/src/test/java/com/google/devtools/build/skyframe/GraphTester.java
+++ b/src/test/java/com/google/devtools/build/skyframe/GraphTester.java
@@ -291,7 +291,7 @@ public class GraphTester {
    * Simple value class that stores strings.
    */
   public static class StringValue implements SkyValue {
-    private final String value;
+    protected final String value;
 
     public StringValue(String value) {
       this.value = value;
@@ -329,6 +329,24 @@ public class GraphTester {
     }
   }
 
+  /** A StringValue that is also a NotComparableSkyValue. */
+  public static class NotComparableStringValue extends StringValue
+          implements NotComparableSkyValue {
+    public NotComparableStringValue(String value) {
+      super(value);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      throw new UnsupportedOperationException(value + " is incomparable - what are you doing?");
+    }
+
+    @Override
+    public int hashCode() {
+      throw new UnsupportedOperationException(value + " is incomparable - what are you doing?");
+    }
+  }
+
   /**
    * A callback interface to provide the value computation.
    */