In a real system, I might have thousands of tests. A good test framework allows me to run them easily and to quickly see if any have failed. This simple feedback is essential to self-testing code. When I work, I’ll be running tests very frequently—checking progress with new code or checking for mistakes with refactoring. The Mocha framework can use different libraries, which it calls assertion libraries, to verify the fixture for a test. Being JavaScript, there are a quadzillion of them out there, some of which may still be current when you’re reading this. The one I’m using at the moment is
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