How do you install and run Mocha the Node js testing module Getting mocha command not found after install

Question

I m having trouble getting Mocha to work as expected  and I d love to say as documented  but there  appears  to not be much documentation on actually getting the thing running   I ve installed it using npm  both globally and locally   and each time when I run it I get     mocha mocha  command not found   Ok  so I figured it s not in my PATH  so I tried running it directly       node modules mocha bin mocha  execvp    No such file or directory   Finally  I tried hitting the other bin file  and got       node modules mocha bin  mocha  path existsSync is deprecated  It is now called  fs existsSync             1 tests complete  1ms    How can I just execute my tests with a single command  Vows seems to let you  but I ve heard Mocha is the better choice  I just can t seem to get it working correctly   And any thoughts on the error I got above in my third attempt   Edit   I m running    Ubuntu 11 10 64-bit Node js 0 7 5 npm 1 1 8 mocha 0 14 1 should 0 6 0

User · Answer

While installing the node modules for mocha I had tried the below commands

npm install
npm install mocha
npm install --save-dev mocha
npm install mocha -g # to install it globally also

and on running or executing the mocha test I was trying

mocha test
npm run test
mocha test test\index.test.js
npm test

but I was getting the below error as:

'Mocha' is not recognized as internal or external command

So , after trying everything it came out to be just set the path to environment variables under the System Variables as:

C:\Program Files\nodejs\

and it worked :)

User · Answer

To run Mocha with mocha command from your terminal you need to install mocha globally on this machine   npm install --global mocha  Then cd to your projectFolder test and run mocha yourTestFileName js   If you want to make mocha available inside your package json as a development dependency   npm install --save-dev mocha  Then add mocha to your scripts inside package json   quot scripts quot          quot test quot    quot mocha quot        Then run npm test inside your terminal

User · Answer

since npm 5 2 0  there s a new command  npx  included with npm that makes this much simpler  if you run   npx mocha  lt args gt    Note  the optional args are forwarded to the command being executed  mocha in this case   this will automatically pick the executable  mocha  command from your locally installed mocha  always add it as a dev dependency to ensure the correct one is always used by you and everyone else    Be careful though that if you didn t install mocha  this command will automatically fetch and use latest version  which is great for some tools  like scaffolders for example   but might not be the most recommendable for certain dependencies where you might want to pin to a specific version   You can read more on npx here    Now  if instead of invoking mocha directly  you want to define a custom npm script  an alias that might invoke other npm binaries     you don t want your library tests to fail depending on the machine setup  mocha as global  global mocha version  etc   the way to use the local mocha that works cross-platform is   node node modules  bin mocha   npm puts aliases to all the binaries in your dependencies on that special folder  Finally  npm will add node modules  bin to the PATH automatically when running an npm script  so in your package json you can do just    scripts        test    mocha      and invoke it with  npm test

User · Answer

After further reading  and confirmation from Linus G Thiel above  I found I simply had to    Downgrade to Node js 0 6 12 And either   Install Mocha as global Add   node modules  bin to my PATH

User · Answer

For windows       Package json      scripts          start    nodemon app js        test    mocha         then run the command   npm run test

[node.js] How do you install and run Mocha, the Node.js testing module? Getting "mocha: command not found" after install

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