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Merge pull request #204 from CodaFi/an-ownership-model
Remove dependence on self in ArrowOf and IsoOf
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // | ||
| // FormatterSpec.swift | ||
| // SwiftCheck | ||
| // | ||
| // Created by Robert Widmann on 11/30/16. | ||
| // Copyright © 2016 Typelift. All rights reserved. | ||
| // | ||
| // Spec due to broomburgo (https://github.com/broomburgo) meant to test lifetime | ||
| // issues in ArrowOf and IsoOf | ||
|
|
||
| import SwiftCheck | ||
| import XCTest | ||
|
|
||
| struct Formatter<Value> { | ||
| let lengthLimit : UInt | ||
| let makeString : (Value) -> String | ||
| let makeValue : (String) -> Value | ||
|
|
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| init(lengthLimit : UInt, makeString : @escaping (Value) -> String, makeValue : @escaping (String) -> Value) { | ||
| self.lengthLimit = lengthLimit | ||
| self.makeString = makeString | ||
| self.makeValue = makeValue | ||
| } | ||
|
|
||
| func format(_ value : Value) -> String { | ||
| let formatted = makeString(value) | ||
| let maxIndex = formatted.index(formatted.startIndex, offsetBy: String.IndexDistance(lengthLimit)) | ||
| if maxIndex >= formatted.endIndex { | ||
| return formatted | ||
| } else { | ||
| return formatted.substring(to: maxIndex) | ||
| } | ||
| } | ||
|
|
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| func unFormat(_ string : String) -> Value { | ||
| let value = makeValue(string) | ||
| return value | ||
| } | ||
| } | ||
|
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| struct ArbitraryFormatter<Value : Arbitrary & CoArbitrary & Hashable> : Arbitrary { | ||
| private let formatter : Formatter<Value> | ||
| init(_ formatter : Formatter<Value>) { | ||
| self.formatter = formatter | ||
| } | ||
|
|
||
| var get : Formatter<Value> { | ||
| return formatter | ||
| } | ||
|
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| static var arbitrary : Gen<ArbitraryFormatter<Value>> { | ||
| return Gen.one(of: [ | ||
| Gen<(UInt, ArrowOf<Value, String>, ArrowOf<String, Value>)> | ||
| .zip(UInt.arbitrary, ArrowOf<Value,String>.arbitrary, ArrowOf<String,Value>.arbitrary) | ||
| .map { Formatter<Value>(lengthLimit: $0, makeString: $1.getArrow, makeValue: $2.getArrow) } | ||
| .map(ArbitraryFormatter.init), | ||
| Gen<(UInt, IsoOf<Value, String>)> | ||
| .zip(UInt.arbitrary, IsoOf<Value, String>.arbitrary) | ||
| .map { Formatter<Value>(lengthLimit: $0, makeString: $1.getTo, makeValue: $1.getFrom) } | ||
| .map(ArbitraryFormatter.init) | ||
| ]) | ||
| } | ||
| } | ||
|
|
||
| class FormatterSpec : XCTestCase { | ||
| func testAlwaysCorrectLength() { | ||
| property( | ||
| "Any formatted string is shorter or equal than the provided length" | ||
| ) <- forAll { (x: Int, af: ArbitraryFormatter<Int>) in | ||
| let formatter = af.get | ||
| let string = formatter.format(x) | ||
| _ = formatter.unFormat(string) | ||
| return string.distance(from: string.startIndex, to: string.endIndex) <= String.IndexDistance(formatter.lengthLimit) | ||
| } | ||
| } | ||
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| #if !(os(macOS) || os(iOS) || os(watchOS) || os(tvOS)) | ||
| static var allTests = testCase([ | ||
| ("testAlwaysCorrectLength", testAlwaysCorrectLength), | ||
| ]) | ||
| #endif | ||
| } |