https://github.com/ktonon/elm-test-extra

Write concise tests for JSON decoders and more
https://github.com/ktonon/elm-test-extra

elm elm-test

Last synced: 2 months ago
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Write concise tests for JSON decoders and more

• Host: GitHub
• URL: https://github.com/ktonon/elm-test-extra
• Owner: ktonon
• License: mit
• Created: 2017-01-18T01:23:54.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2020-07-03T21:38:03.000Z (over 4 years ago)
• Last Synced: 2024-09-29T08:05:18.422Z (3 months ago)
• Topics: elm, elm-test
• Language: Elm
• Homepage:
• Size: 25.4 KB
• Stars: 4
• Watchers: 2
• Forks: 4
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
elm-test-extra

==============

[![elm-package](https://img.shields.io/badge/elm-2.0.1-blue.svg)](http://package.elm-lang.org/packages/ktonon/elm-test-extra/latest)

[![CircleCI](https://img.shields.io/circleci/project/github/ktonon/elm-test-extra.svg)](https://circleci.com/gh/ktonon/elm-test-extra)

Extra expectations, fuzzers, testers and describers.

`elm package install` [ktonon/elm-test-extra][]

## Example: Describing JSON Decoders

Write concise test for JSON decoders.

Use the high level `describeDecoder` to quickly write tests that exercise a `Json.Decode.Decoder`. For example,

```elm

describeDecoder "int"

  Json.Decode.int

  Debug.toString

  [ ( "", FailsToDecode )

  , ( "\"foo\"", FailsToDecode )

  , ( "1", DecodesTo 1 )

  , ( "1.5", FailsToDecode )

  , ( "\"this-will-fail\"", DecodesTo 5)

  ]

```

In this example, the last test will fail, giving helpful feedback:

```

↓ int

✗ this-will-fail DecodesTo 5

Expected input:

  "this-will-fail"

to decode successfully, but instead it failed with message:

  Problem with the given value:

"this-will-fail"

Expecting an INT

```

[ktonon/elm-test-extra]:http://package.elm-lang.org/packages/ktonon/elm-test-extra/latest