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26 lines
550 B
Swift
26 lines
550 B
Swift
struct RangedDiff {
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typealias Term = RangedTerm.Term
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typealias Diff = Free<String, Patch<Term>>
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let a: Term
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let b: Term
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let diff: Diff
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}
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extension RangedDiff: Arbitrary {
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static let interpreter = Interpreter<Term>(equal: ==, comparable: const(true), cost: Diff.sum(Patch.difference))
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static var arbitrary: Gen<RangedDiff> {
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return RangedTerm.arbitrary.bind { a in
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RangedTerm.arbitrary.fmap { b in
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RangedDiff(a: a.term, b: b.term, diff: interpreter.run(a.term, b.term))
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}
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}
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}
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}
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import Doubt
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import Prelude
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import SwiftCheck
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