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49 lines
1.7 KiB
Racket
49 lines
1.7 KiB
Racket
#lang racket/base
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(require "racket.rkt")
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(require racket/match)
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#|
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approximates
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https://github.com/mbutterick/restructure/blob/master/test/Bitfield.coffee
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|#
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;describe 'Bitfield', ->
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; bitfield = new Bitfield uint8, ['Jack', 'Kack', 'Lack', 'Mack', 'Nack', 'Oack', 'Pack', 'Quack']
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; JACK = 1 << 0
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; KACK = 1 << 1
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; LACK = 1 << 2
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; MACK = 1 << 3
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; NACK = 1 << 4
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; OACK = 1 << 5
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; PACK = 1 << 6
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; QUACK = 1 << 7
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(define bitfield (+Bitfield uint8 '(Jack Kack Lack Mack Nack Oack Pack Quack)))
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(match-define (list JACK KACK LACK MACK NACK OACK PACK QUACK)
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(map (curry arithmetic-shift 1) (range 8)))
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; it 'should have the right size', ->
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(check-equal? (size bitfield) 1)
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; it 'should decode', ->
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(parameterize ([current-input-port (open-input-bytes (bytes (bitwise-ior JACK MACK PACK NACK QUACK)))])
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(check-equal? (decode bitfield) (mhasheq 'Quack #t
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'Nack #t
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'Lack #f
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'Oack #f
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'Pack #t
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'Mack #t
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'Jack #t
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'Kack #f)))
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; it 'should encode', (done) ->
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(check-equal? (encode bitfield (mhasheq 'Quack #t
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'Nack #t
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'Lack #f
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'Oack #f
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'Pack #t
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'Mack #t
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'Jack #t
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'Kack #f) #f)
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(bytes (bitwise-ior JACK MACK PACK NACK QUACK)))
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