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 If you'd like to run only one test file with Jest to see the result of that file's tests, here is how you can do that.
 Make sure your <code>package.json</code> file contains the following.
 <pre class="language-json"><code class="language-json code-highlight">"scripts": {
 "test": "jest --runInBand --forceExit",
}
</code></pre>
 Then, run the following command.
 <pre class="language-bash"><code class="language-bash code-highlight">npm test -- user.service.spec.ts
</code></pre>
 The <code>--</code> marks the end of options. Anything entered after the <code>--</code> is passed to the command being run, which is <code>jest</code> in this case. Thus, the file <code>user.service.spec.ts</code> is passed to the <code>jest</code> command to run that file's tests.
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