Extra expectations, fuzzers, testers and describers.
elm package install
ktonon/elm-test-extra
Write concise test for JSON decoders.
Use the high level describeDecoder
to quickly write tests that exercise a Json.Decode.Decoder
. For example,
describeDecoder "int"
Json.Decode.int
[ ( "", 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:
Expecting an Int but instead got: "this-will-fail"