List<Throwable> getErrors() {
      return (List<Throwable>) readField(ErrorCollector.class, this, "errors");
    }
Sets the expected result of running the thread to be a value matching the given value

@param expectedValue the value expected to be returned from the thread. The value must
       implement equals
@return this, the ConcurrentOperation (containing a callable) that has been set to repeat
geode-junit/src/main/java/org/apache/geode/test/junit/rules/ConcurrencyRule.java