next.js testing with jest

-

I stumbled upon the testing overview in the react docs, which says The default template of React Native ships with [Jest](https://jestjs.io) testing framework. Interesting. I’ll have a quick go of Jest just to see what’s what.

Jest

[about 30 minutes later…] Well… I wish I’d stumbled across this first, this was super easy!

yarn add --dev jest

in package.json:

{
  "scripts": {
    "test": "jest"
  }
}

Create a ./tests/foo.spec.js file with the contents:

test('true is true', () => {
  expect(true).toBe(true);
});

And run

yarn test

The nice thing about Jest, is that it:

  • has fluent syntax so I don’t feel the need for chai,
  • appears to have mocking functionality, but we’ll see later if that’s any good for TDD. This might mean we don’t need sinon.
  • it clearly is a replacement for mocha, so we can swap that out

Enzyme on the other hand might still add value if it makes testing components easier! We’ll see how that fits in later.

Popular posts from this blog

Taking a memory dump of a w3wp process

-
Taking a memory dump of a w3wp process Taking a memory dump of an IIS worker process in a live system can be problematic, as IIS will kill the process if it has been suspended for more than 60 seconds. Only use these steps if your application is on a high availability cluster, else you’ll take your app down! copy sysinternals procdump.exe and pssuspend.exe to target machine create powershell file with: $iispid = Get-Process svchost | ? { $_ . modules . ModuleName -eq "iisw3adm.dll" } | Select - First 1 - ExpandProperty Id $workerpid = Get-Process w3wp | Sort ws - Descending | Select - First 1 - ExpandProperty Id & ".\pssuspend.exe" $iispid Write-Output "Creating memory dump for w3wp PID $workerpid " & ".\procdump.exe" - ma $workerpid & ".\pssuspend.exe" $iispid - r (taken from stackoverflow ) 3) check the w3wp process has reached the high level of RAM usage that you’re intending to...
Read more

GitLab Badges

-
Image
GitLab has built in functionality to allow you to add badges, to provide an at-a-glance status of your app's quality.  In order to set project badges up, you need to be a maintainer of the project so that you can access the settings. Pipeline Status This shows whether your master branch pipeline has passed or failed.  The badge is super easy to set up.  In GitLab go to Settings > General > Badges > Add Badge, and enter this: Name:  Pipeline Link:  https://gitlab.com/%{project_path}/commits/%{default_branch} Badge: https://gitlab.com/%{project_path}/badges/%{default_branch}/pipeline.svg These links should be right for any project, as they're using variables. Coverage % Code coverage is a little more involved, as it relies on you having already configured code coverage in your app.  For the app I've been working on, which is a dotnet application, I opted to use the opensource MiniCover .  This is configured to writes a code c...
Read more

sp_blitzIndex

-
Some more notes after watching Brent’s How I Use the First Responder Kit: sp BlitzIndex . This sproc will analyse every index across all databases in your sql server and return a prioritised list of potential issues. EXEC sp_blitzIndex @GetAllDatabases = 1 The MoreInfo column is interesting. If you copy the SQL out and run it, it will give you more information on the indexing issue in question. E.g: EXEC dbo . sp_BlitzIndex @DatabaseName = 'YourDatabase' , @SchemaName = 'dbo' , @TableName = 'tFoo' ; If you run this, the top result set it a list of indexes that are on the target table. It shows how many seeks and scans each index has had, the size of the index, etc. Note the URL column for more information on each issue category. Missing indexes are shown in the 2nd result set. The 3rd result set shows the table definition, which is nice to have without having to mess with the SSMS UI.
Read more