A interface will be called when visiting a module.

        @param node: node of current module

def visit_module(self, node):
        """
        A interface will be called when visiting a module.

        @param node: node of current module
        """
        modulename = node.name.split(".")[-1]
        if isTestModule(node.name) and self.moduleContainsTestCase(node):
            self._checkTestModuleName(modulename, node)