Python uses the "Pyvows" library to perform asynchronous testing skills and precautions

In Python, we can use the "Pyvows" library to perform asynchronous testing.Asynchronous testing refers to the test of asynchronous code to ensure that it can work correctly during concurrent and parallel execution.Here are some techniques and precautions when using "PYVOWS" for asynchronous testing. Skill: 1. Mark using the decorative device: You can use the "@vows.async_topic" modifier to mark a test function as an asynchronous test theme.After marking as an asynchronous test theme, the test function will be regarded as asynchronous testing and can be used as an asynchronous test assertion. 2. Use asynchronous words: "Pyvows" provides a series of asynchronous words, such as "Self.expect (Topic) .to_be_a (Greenlet)" and "Self.expect (Topic) .to_yield_a_Value ()".These assertions allow you to wait for the completion of asynchronous operations and assert the results. 3. Use asynchronous test kit: "Pyvows" provides an asynchronous test kit. You can run with the "VOWS.RUNNER ()" method.This kit can run multiple asynchronous test themes at the same time and output the test results in the specified format. Precautions: 1. Configure asynchronous operating environment: Before performing asynchronous tests, you need to configure the asynchronous operating environment.You can use the "VOWS.ASYNC ()" method to configure the asynchronous operating environment.This includes starting asynchronous schedules and other settings related to asynchronous operations. 2. Setting timeout: Because the execution time of asynchronous operation is uncertain, it is very important to set the appropriate timeout time when performing asynchronous testing.You can use the "Self.timeout ()" method in the test function to set the timeout to terminate the test at time. 3. Processing asynchronous abnormalities: In the asynchronous test, the operation may throw an exception.You can use "Self.expect (TOPIC). Not_to_be_an_AN_ERROR ()" to assert that the strange operation will not throw an abnormality, or use the "self.expect (topic) .to_be_an_error ()" to assert that the strange step operation will throw an exception. The following is a sample code for asynchronous testing using "Pyvows": from pyvows import Vows, expect @Vows.async_topic def topic(): # Asynchronous operation code def async_operation(callback): # Execute asynchronous operation # ... #Clene -callback function after the asynchronous operation is completed callback(result) # Call asynchronous operation async_operation(callback) def callback(result): # To the results of the asynchronous operation expect(result).to_equal(expected_result) Vows.expects(topic).to_return_a_value() In the above sample code, we use "@VOWS.Async_topic" decorative to mark the "Topic" function as an asynchronous test theme.`async_operation` function is an example of asynchronous operation. It accepts a callback function as a parameter.In the callback function, we asserted the "expect" of the results of the asynchronous operation.Finally, we use the "VOWS.EXPECTS ()" method to set the expectations of the test theme, and use "to_return_a_value ()" to assert that asynchronous operations return a value. By using the above techniques and following precautions, you can use the "Pyvows" library to perform asynchronous testing more easily, and ensure that your asynchronous code can work properly.