Found a total of 10000 related content
React Testing Library: Solution to test the file is empty when uploading
Article Introduction：This article aims to solve the problem that the file object is empty when using React Testing Library for file upload testing. By providing a custom createFile function, it simulates real file objects, ensuring that the file upload behavior in the test environment is consistent with the browser environment, thereby achieving more reliable testing.
2025-09-10
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269
Jasmine/Karma test: How to simulate external library properties on window objects
Article Introduction：This article introduces in detail how to effectively simulate external library properties defined on window objects in JavaScript in Karma and Jasmine environments. Ensure unit test isolation and accuracy by delving into common simulation failure cases and providing a robust solution for property setting and cleaning using beforeEach and afterEach hooks. This tutorial is intended to help developers realize reliable testing of global dependencies without modifying core business code.
2025-08-19
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728
How to Test stopPropagation() in React Testing Library
Article Introduction：Introduction: Testing stopPropagation() in React
Correctly implementing stopPropagation() is vital when dealing with nested click events in React. Instead of directly verifying stopPropagation()'s call, focus on testing its outcome: does the event
2025-01-29
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818
Implementing MySQL Database Testing Frameworks
Article Introduction：To build a MySQL database testing framework, you need to select the right tools, design good use cases, automate execution and cover key scenarios. 1. The tool selection should be selected based on the team's technical stack. For example, MySQL comes with test-run for simple testing, PyTest is suitable for complex logic, JMeter focuses on performance, and DBUnit is suitable for Java ecosystem. 2. The test content should cover the table structure, SQL syntax, stored procedure results, transaction processing and performance boundaries. 3. The test data should be clean and controllable, and can be implemented through transaction rollback, fixed data insertion or mock data. 4. Automated testing should be integrated into the CI/CD process, and the test execution should be triggered through scripts and the results should be output.
2025-07-21
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851
React Basics~unit test/custom hook
Article Introduction：When I test a custom hook component, I use a renderHook imported from @testing-library/react' and an act imported fromreact-dom/test-utils'.
?src/App.tsx
import "./App.css";
import Counter from "./component/counter/Counter";
2024-11-01
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1046
React Basics~unit test/ui
Article Introduction：When I test current code, which is unit test, I use some tools. They are jest and react-testing-library.
?src/Example.js
import Greet from "./components/Greet";
const Example = () => {
return ;
};
export default Example;
?s
2024-10-20
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331
Efficient processing of default parameters with parameterized tests in Python Unittest
Article Introduction：This article explores how to use the parameterized.expand library in the Python unittest framework to gracefully combine tests on function default parameters and non-default parameters by introducing a sentinel value. This method can effectively reduce test code duplication, improve test efficiency and maintainability, and avoid writing test functions separately for default parameters.
2025-08-25
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303
How to efficiently load Doctrine test data in Symfony application? Use Composer and liip/test-fixtures-bundle to do it!
Article Introduction：When developing Symfony applications, the loading efficiency of test data directly affects the execution speed and overall development efficiency of test cases. Recently, I encountered this problem when working on a project: every time I run a test case, the Doctrine test data is loaded for too long, which seriously affects the development progress. To solve this problem, I tried various methods and finally installed the liip/test-fixtures-bundle library through Composer, which successfully improved the loading efficiency of the test data.
2025-04-17
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542
React Basics~unit test/user event
Article Introduction：When I test a user event, I use the fireEvent function of the react-testing-library.
?src/Example.js
import Counter from "./components/Counter";
const Example = () => {
const originCount = 0;
return &
2024-10-21
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566
Troubleshooting MySQL Replication Delays and Lag
Article Introduction：Common causes and troubleshooting methods for MySQL master-slave replication delay are as follows: 1. Check the network status, use ping/traceroute to test delays and packet loss, use telnet to test port connectivity, and test the actual bandwidth through iperf; 2. Analyze the slave library processing capabilities, check the Seconds_Behind_Master field, monitor the CPU, memory, and IO usage, and enable multi-threaded replication to improve parallel capabilities; 3. Confirm the write pressure of the master library, use SHOWPROCESSLIST to check long-term write operations, optimize slow queries, and reduce replication link load; 4. Check the rationality of replication configuration, adjust sync_relay_log, relay_log_recov
2025-07-28
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941
Master requests-mock: Efficiently simulate dynamic URL requests and response sequences
Article Introduction：This tutorial explores in-depth how to use the requests-mock library to efficiently simulate HTTP requests initiated by the requests library in Python, especially for URLs containing dynamic parameters such as page numbers. The article will explain in detail how to use regular expressions to match URLs and simulate a series of different responses through the side_effect parameter, so as to accurately control the behavior of external API calls in the test environment and ensure the isolation and reliability of the test.
2025-08-15
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657
How to test an API with Python
Article Introduction：To test the API, you need to use Python's Requests library. The steps are to install the library, send requests, verify responses, set timeouts and retry. First, install the library through pipinstallrequests; then use requests.get() or requests.post() and other methods to send GET or POST requests; then check response.status_code and response.json() to ensure that the return result is in compliance with expectations; finally, add timeout parameters to set the timeout time, and combine the retrying library to achieve automatic retry to enhance stability.
2025-07-12
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843
How to write a unit test for a Vue component that uses Vuex?
Article Introduction：Create a test-specific Vuexstore and initialize it with createStore; 2. Inject store through mount's global.plugins; 3. Use jest.fn() to simulate actions to verify calls; 4. Test the responsiveness of the component when the store state changes; 5. Optionally mock the store partially or use @testing-library/vue; finally implement isolated and reliable unit testing to ensure that the component interacts correctly with Vuex, the test is complete and maintainable.
2025-08-03
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428
How can you effectively test Go code using the built-in testing package?
Article Introduction：The key to Go code testing is to organize the test files correctly, write clear assertions, and utilize standard library tools. 1. The test file should be in the same package as the code being tested, and the file name ends with _test.go; 2. The test function must start with Test and be accompanied by a descriptive name; 3. Creating subtests with t.Run() can improve output readability and test flexibility; 4. Use the getest command when running the test, and run specific tests with the -run flag; 5. It is recommended to use a table-driven test mode to define multiple test cases through structure slices, making the test logic simpler and easier to expand. Following these practices can effectively improve the quality and efficiency of Go code testing.
2025-06-10
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777
JavaScript Testing Tool Showdown: Sinon.js vs testdouble.js
Article Introduction：When unit testing real-world code, many situations make the test difficult to write. How to check if a function is called? How to test Ajax calls? Or code using setTimeout? At this time, you need to use Test Stand-in-Replace the code to make it easier to test within difficult to test.
Sinon.js has been the actual standard for creating test stand-ins in JavaScript testing for years. It is an essential tool for any JavaScript developer who writes tests, because without it, it is nearly impossible to write tests for real applications.
Recently, a new library called testdouble.js is on the rise. It has a
2025-02-16
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1150
Unit Testing JavaScript with Jest and React Testing Library
Article Introduction：Jest and ReactTestingLibrary are the gold standard for React application testing. Jest provides test runs, assertions, _mock_ and coverage reports. ReactTestingLibrary tests components by simulating user behavior and accessibility queries. If you use CreateReactApp, both are built in. Custom configurations require installing jest, @testing-library/react and setting jest.config.js and Babel configurations; unit tests use test() and expect() to verify function logic, such as formatPrice function formatting results; component test pass r
2025-07-25
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788
Use requests-mock to efficiently simulate dynamic URL requests and multi-stage responses
Article Introduction：This tutorial is designed to explain in detail how to mock test dynamic URL requests using Python's requests-mock library. The article will focus on how to use regular expressions to match dynamic URLs, and how to simulate responses at different request stages (including status codes and response content) through custom callback functions, so as to effectively test code logic that relies on external APIs to ensure the isolation, stability and controllability of the test.
2025-08-16
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510
How to write unit tests for your Python code
Article Introduction：Writing unit tests using Python's built-in unittest framework or a simpler pytest library can effectively verify function behavior, simplify debugging and improve code maintainability; first choose unittest or install pytest, create test files and write test methods starting with test_, cover normal and boundary situations, keep test independent, and use mock to isolate external dependencies. Finally, run tests through the pythontest_file.py or pytest command to ensure the quality of the code.
2025-08-30
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903
