Change default timeout for mocha

Question

If we have a unit test file my-spec js and running with mocha    mocha my-spec js   The default timeout will be 2000 ms  It can be overwritten for partial test with a command line parameter    mocha my-spec js --timeout 5000   Is it possible to change the default timeout globally for all tests   i e  the default timeout value will be different from 2000 ms when you call   mocha my-spec js

User · Answer

Just adding to the correct answer you can set the timeout with the arrow function like this   it  Some test        gt        timeout 5000

User · Answer

By default Mocha will read a file named test mocha opts that can contain command line arguments  So you could create such a file that contains   --timeout 5000   Whenever you run Mocha at the command line  it will read this file and set a timeout of 5 seconds by default   Another way which may be better depending on your situation is to set it like this in a top level describe call in your test file   describe  something   function          this timeout 5000            tests          This would allow you to set a timeout only on a per-file basis   You could use both methods if you want a global default of 5000 but set something different for some files     Note that you cannot generally use an arrow function if you are going to call this timeout  or access any other member of this that Mocha sets for you   For instance  this will usually not work   describe  something        gt        this timeout 5000     will not work         tests          This is because an arrow function takes this from the scope the function appears in  Mocha will call the function with a good value for this but that value is not passed inside the arrow function  The documentation for Mocha says on this topic      Passing arrow functions     lambdas     to Mocha is discouraged  Due to the lexical binding of this  such functions are unable to access the Mocha context

User · Answer

In current versions of Mocha  the timeout can be changed globally like this   mocha timeout 5000     Just add the line above anywhere in your test suite  preferably at the top of your spec or in a separate test helper     In older versions  and only in a browser  you could change the global configuration using mocha setup   mocha setup   timeout  5000         The documentation does not cover the global timeout setting  but offers a few examples on how to change the timeout in other common scenarios

User · Answer

Adding this for completeness   If you  like me  use a script in your package json file  just add the --timeout option to mocha    scripts        test    mocha  test      js  --timeout 10000      test-debug    mocha --debug  test      js  --timeout 10000       Then you can run npm run test to run your test suite with the timeout set to 10 000 milliseconds

[javascript] Change default timeout for mocha

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