1. Background
With more and more functions on the platform, complex interfaces and associated data, traditional functional testing cannot meet the requirements of coverage testing, so Gu built an automated unit test for TypeScript.
This test system has the following advantages:
- Shorten test time: Through the automated test system, test cases can be executed with one click, and test reports and code coverage reports can be generated. Developers can analyze the problem and untested code based on the report.
- Higher return on investment: automated testing is faster than traditional functional testing, and test cases can be reused, avoiding repeated testing of "associated functions" after functional development. This reduces testing and development time, which is extremely beneficial in markets where fast response is critical.
- Early defect detection: in the stage of writing white-box test cases, it is equivalent to doing a code walkthrough, which can analyze the obvious logic errors in the code; Exposure prior to system testing.
- Higher test coverage: The test scope of automated unit tests is more comprehensive. Compared with traditional test methods, it can cover more comprehensive code logic and functional logic, thereby reducing the probability of failure after release.
2. The concept of technology stack
Karma is a node.js-based JavaScript test execution process management tool. It can pull up all major browsers, load test scripts, run test cases, and close the browser after completion.
Mocha (Mocha) is a unit testing testing framework/library, which can be used to write test cases.
Chai is a BDD/TDD assertion library for node and browser, which can be perfectly paired with any javascript testing framework, supporting BDD-style expect, should and TDD-style assert.
We mainly use Karma and Mocha to realize automated testing.