Installing and running Jest
First, let's install the Jest command-line interface (Jest CLI):
npm install –-save-dev jest-cli
This command installs the Jest CLI, and adds it as a development dependency to our ~/snapterest/package.json
file. Next, let's edit the package.json
file. We'll replace the existing "script"
object:
"scripts": { "test": "echo \"Error: no test specified\" && exit 1" },
Replace the preceding object with the following one:
"scripts": { "test": "jest" },
Now we're ready to run our test suit. Navigate to the ~/snapterest/
directory, and run the following command:
npm test
You should see the following message in your Terminal:
Using Jest CLI v0.4.18 PASS source/utils/__tests__/TweetUtils-test.js (0.065s) 1 test passed (1 total)
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