Tests/QueueTests.swift

/*
 * The MIT License (MIT)
 *
 * Copyright (C) 2019, CosmicMind, Inc. <http://cosmicmind.com>.
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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import XCTest
@testable import Algorithm

class QueueTests: XCTestCase {
  
  override func setUp() {
    super.setUp()
  }
  
  override func tearDown() {
    super.tearDown()
  }
  
  func testInt() {
    var q = Queue<Int>()
    
    q.enqueue(1)
    q.enqueue(2)
    q.enqueue(3)
    
    XCTAssert(3 == q.count, "Count incorrect, got \(q.count).")
    XCTAssert(1 == q.peek, "Peek incorrect, got \(String(describing: q.peek))")
    
    q.enqueue(5)
    q.enqueue(6)
    q.enqueue(7)
    
    XCTAssert(6 == q.count, "Count incorrect, got \(q.count).")
    XCTAssert(1 == q.peek, "Peek incorrect, got \(String(describing: q.peek))")
    
    XCTAssert(1 == q.dequeue() && 5 == q.count && 2 == q.peek, "Dequeue incorrect")
    XCTAssert(2 == q.dequeue() && 4 == q.count && 3 == q.peek, "Dequeue incorrect")
    XCTAssert(3 == q.dequeue() && 3 == q.count && 5 == q.peek, "Dequeue incorrect")
    XCTAssert(5 == q.dequeue() && 2 == q.count && 6 == q.peek, "Dequeue incorrect")
    XCTAssert(6 == q.dequeue() && 1 == q.count && 7 == q.peek, "Dequeue incorrect")
    XCTAssert(7 == q.dequeue() && 0 == q.count && nil == q.peek, "Dequeue incorrect")
    
    q.enqueue(1)
    q.enqueue(2)
    q.enqueue(3)
    q.removeAll()
    
    XCTAssert(0 == q.count, "Count incorrect, got \(q.count).")
    
    q.enqueue(1)
    q.enqueue(2)
    q.enqueue(3)
  }
  
  func testConcat() {
    var q1 = Queue<Int>()
    q1.enqueue(1)
    q1.enqueue(2)
    q1.enqueue(3)
    
    var q2 = Queue<Int>()
    q2.enqueue(4)
    q2.enqueue(5)
    q2.enqueue(6)
    
    var q3 = q1 + q2
    
    for x in q1 {
      XCTAssert(x == q3.dequeue(), "Concat incorrect.")
    }
    
    for x in q2 {
      XCTAssert(x == q3.dequeue(), "Concat incorrect.")
    }
    
    q3.removeAll()
    var q4 = q1 + q2 + q3
    for x in q4 {
      XCTAssert(x == q4.dequeue(), "Concat incorrect.")
    }
  }
  
  func testPerformance() {
    self.measure() {}
  }
}