Make Quick & Nimble tests much more pleasant in Swift

QuickExtensions.swift

//
//  QuickExtensions.swift
//  PlanLib
//
//  Created by Russ Bishop on 3/16/16.
//  Copyright © 2016 PlanGrid. All rights reserved.
//  MIT Licensed, use freely.

import Foundation
import Quick
import Nimble

public func describe(description: String, flags: FilterFlags = [:], closure: () throws -> ()) {
    describe(description, flags: flags, closure: {
        do {
            try closure()
        } catch {
            fail("Unexpected error thrown during test: \(error)")
        }
    })
}

public func context(description: String, flags: FilterFlags = [:], closure: () throws -> ()) {
    describe(description, flags: flags, closure: closure)
}

public func it(description: String, flags: FilterFlags = [:], file: String = __FILE__, line: UInt = __LINE__, closure: () throws -> ()) {
    it(description, flags: flags, file: file, line: line, closure: { () -> Void in
        do {
            try closure()
        } catch {
            fail("Unexpected error thrown during test: \(error)", file: file, line: line)
        }
    })
}