#IUO XCTestCase.waitForExpectationsWithTimeout 's second argument should be Optional and default to nil

Originator:Ziad.khoury.h
Number:rdar://18403222 Date Originated:20-Sep-2014 10:08 AM
Status:Open Resolved:
Product:Developer Tools Product Version:6.0.1 (6A317)
Classification:Enhancement Reproducible:Always
 
Summary:
Swift declares:
    XCTestCase.waitForExpectationsWithTimeout(timeout: NSTimeInterval, handler handlerOrNil: XCWaitCompletionHandler!)

`handerOrNil` should be `XCWaitCompletionHandler?` and default to `nil`, like:
    XCTestCase.waitForExpectationsWithTimeout(timeout: NSTimeInterval, handler handlerOrNil: XCWaitCompletionHandler? = nil)

So that it can be called without providing nil as the second argument.

Steps to Reproduce:
In a swift XC test write:
    self.waitForExpectationsWithTimeout(1)

Expected Results:
It works without compiler errors

Actual Results:
Gives a compile-time error:
    Type '(NSTimeInterval, handler: XCWaitCompletionHandler!)' does not conform to protocol 'IntegerLiteralConvertible'

Version:
Xcode 6.0.1 (6A317)

Notes:
As workaround I added the following extension to XCTestCase:
public extension XCTestCase {
    public func waitForExpectationsWithTimeout(timeout: NSTimeInterval) {
        self.waitForExpectationsWithTimeout(timeout, handler: nil)
    }
}

Configuration:
OS X 10.9.5

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