Hard_042_Trapping_Rain_Water_Test.swift

//
//  Hard_042_Trapping_Rain_Water_Test.swift
//  Solutions
//
//  Created by Di Wu on 5/22/15.
//  Copyright (c) 2015 diwu. All rights reserved.
//

import XCTest

class Hard_042_Trapping_Rain_Water_Test: XCTestCase, SolutionsTestCase {
    func test_001() {
        let input: [Int] = [0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1]
        let expected: Int = 6
        asyncHelper(input: input, expected: expected)
    }
    func test_002() {
        let input: [Int] = []
        let expected: Int = 0
        asyncHelper(input: input, expected: expected)
    }
    func test_003() {
        let input: [Int] = [999]
        let expected: Int = 0
        asyncHelper(input: input, expected: expected)
    }
    func test_004() {
        let input: [Int] = [1, 999]
        let expected: Int = 0
        asyncHelper(input: input, expected: expected)
    }
    func test_005() {
        let input: [Int] = [1, 0, 2, 0, 0]
        let expected: Int = 1
        asyncHelper(input: input, expected: expected)
    }
    func test_006() {
        let input: [Int] = [1, 0, 2, 0, 0, 999, 998, 2, 4, 0, 0]
        let expected: Int = 7
        asyncHelper(input: input, expected: expected)
    }
    func test_007() {
        let input: [Int] = [1, 0, 1, 0, 0, 999, 998, 2, 4, 0, 0]
        let expected: Int = 5
        asyncHelper(input: input, expected: expected)
    }
    private func asyncHelper(input: [Int], expected: Int) {
        weak var expectation: XCTestExpectation? = self.expectation(description:timeOutName())
        serialQueue().async(execute: { () -> Void in
            let result: Int = Hard_042_Trapping_Rain_Water.trap(input)
            assertHelper(expected == result, problemName:self.problemName(), input: input, resultValue: result, expectedValue: expected)
            if let unwrapped = expectation {
                unwrapped.fulfill()
            }
        })
        waitForExpectations(timeout:timeOut()) { (error: Error?) -> Void in
            if error != nil {
                assertHelper(false, problemName:self.problemName(), input: input, resultValue:self.timeOutName(), expectedValue: expected)
            }
        }
    }
}