Created
February 26, 2016 02:06
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Custom Nimble matcher for use with the Promissum library
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import Promissum | |
import Nimble | |
private func stringifyPromise<T, U>(promise: Promise<T, U>) -> String { | |
switch promise.result { | |
case nil: return "<pending>" | |
case let .Value(value)?: return "<resolved: \(value)>" | |
case let .Error(error)?: return "<rejected: \(error)>" | |
} | |
} | |
private func promiseMatcher<T, U>( | |
postfixMessage postfixMessage: String, | |
checker: Result<T, U>? -> Bool) -> NonNilMatcherFunc<Promise<T, U>> { | |
return NonNilMatcherFunc { actualExpression, failureMessage in | |
failureMessage.postfixMessage = postfixMessage | |
if let actualValue = try actualExpression.evaluate() { | |
failureMessage.actualValue = stringifyPromise(actualValue) | |
return checker(actualValue.result) | |
} | |
return false | |
} | |
} | |
func beResolved<T, U>() -> NonNilMatcherFunc<Promise<T, U>> { | |
return promiseMatcher(postfixMessage: "be resolved", checker: { result in | |
switch result { | |
case .Value?: return true | |
default: return false | |
} | |
}) | |
} | |
func beRejected<T, U>() -> NonNilMatcherFunc<Promise<T, U>> { | |
return promiseMatcher(postfixMessage: "be rejected", checker: { result in | |
switch result { | |
case .Error?: return true | |
default: return false | |
} | |
}) | |
} | |
func bePending<T, U>() -> NonNilMatcherFunc<Promise<T, U>> { | |
return promiseMatcher(postfixMessage: "be pending", checker: { result in | |
switch result { | |
case nil: return true | |
default: return false | |
} | |
}) | |
} | |
///// | |
struct Handler: AssertionHandler { | |
func assert(assertion: Bool, message: FailureMessage, location: SourceLocation) { | |
if !assertion { | |
print("\(location): \(message.stringValue)") | |
} | |
} | |
} | |
NimbleAssertionHandler = Handler() | |
///// | |
let resolvedPromise: Promise<Int, NoError> = Promise(value: 42) | |
expect(resolvedPromise).to(beResolved()) | |
expect(resolvedPromise).to(beRejected()) | |
expect(resolvedPromise).to(bePending()) | |
let rejectedPromise : Promise<(), NSError> = Promise(error: NSError(domain: "", code: 0, userInfo: nil)) | |
expect(rejectedPromise).to(beResolved()) | |
expect(rejectedPromise).to(beRejected()) | |
expect(rejectedPromise).to(bePending()) | |
let pendingPromise: Promise<Int, NoError> = PromiseSource().promise | |
expect(pendingPromise).to(beResolved()) | |
expect(pendingPromise).to(beRejected()) | |
expect(pendingPromise).to(bePending()) |
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