when piped through

<Stream> [when] piped through <array|Stream> <assertion?>

Pipe the output of a readable stream through a transform stream or a sequence of transform streams, then delegate to another assertion using the last stream as the subject.

It's intended to be used with the to yield output satisfying assertion:

return expect(

require('fs').createReadStream('LICENSE'),

'when piped through',

require('zlib').Gzip(),

'to yield output satisfying',

'to have length',

792

);

Example with multiple transform streams:

return expect(

require('fs').createReadStream('LICENSE'),

'when piped through',

[require('zlib').Gzip(), require('zlib').Gunzip()],

'to yield output satisfying',

'when decoded as',

'ascii',

'not to contain',

'IMPLIED WARRANTIES'

);

expected ReadStream

when piped through [ Gzip, Gunzip ] to yield output satisfying when decoded as 'ascii' not to contain 'IMPLIED WARRANTIES'

expected Gunzip

to yield output satisfying when decoded as 'ascii' not to contain 'IMPLIED WARRANTIES'

expected Buffer.from([0x43, 0x6F, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x20, 0x28, 0x63, 0x29, 0x20, 0x32, 0x30 /* 1478 more */ ])

when decoded as 'ascii' not to contain 'IMPLIED WARRANTIES'

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