code: public boolean assertExpression(String variableNameExpression, String expectedValue)
      {
      	Expression expression = new Expression(variableNameExpression);
      	return expectedValue.equals(this.variables.get(expression.parseVariableName()));
      }
docs: <p>assertExpression.</p>
  
  @param variableNameExpression a {@link java.lang.String} object.
  @param expectedValue a {@link java.lang.String} object.
  @return a boolean.