Update test runner to forgive variant context strings in Error messages

Author: rwaldron

src/test/run.js

@@ -34,9 +34,23 @@ function runOneSync(name, selname, p) {
         });
     } catch(e) {
         got = e.toString();
-        if (want.trim() != got.trim()) throw e;
+        if (want.trim() != got.trim()) {
+             
+            // The error messages will have consistent prefix strings, but variant context strings
+            if ( want.trim().indexOf("Error") === -1 && got.trim().indexOf( want.trim() ) !== 0 ) {
+              throw e;
+            }
+            //console.log( "want: " + want.trim() );
+            //console.log( "got: " + got.trim() );
+        }
+    }
+    if (want.trim() != got.trim()) {
+      //console.log( "want: " + want.trim() );
+      //console.log( "got: " + got.trim() );    
+      if ( want.trim().indexOf("Error") === -1 && got.trim().indexOf( want.trim() ) !== 0 ) {
+        throw "mismatch";                       
+      }
     }
-    if (want.trim() != got.trim()) throw "mismatch";
 }