diff --git a/src/core/test.h b/src/core/test.h
index 356c08ee2..809c44f0d 100644
--- a/src/core/test.h
+++ b/src/core/test.h
@@ -118,6 +118,23 @@ private:
                    << ", got " << (got) << std::endl;   \
         result = false;                                 \
       }
+/**
+ * Convenience macro to check that a value returned by a test is what
+ * is expected.  Note: this macro assumes a 'bool result = true'
+ * declaration exists in the test function body, and that the function
+ * returns that value.
+ *
+ * \param got value obtained from the test
+ * \param expected value that the test is expected to return
+ */
+#define NS_TEST_ASSERT_UNEQUAL(got, expected)           \
+    if ((got) == (expected))                            \
+      {                                                 \
+        Failure () << __FILE__ << ":" <<__LINE__        \
+                   << ": did not want " << (expected)   \
+                   << ", got " << (got) << std::endl;   \
+        result = false;                                 \
+      }
 /**
  * Convenience macro to check an assertion is held during an unit
  * test.  Note: this macro assumes a 'bool result = true' declaration