Kingfisher/Tests/KingfisherTests/UIButtonExtensionTests.swift

//
//  UIButtonExtensionTests.swift
//  Kingfisher
//
//  Created by Wei Wang on 15/4/17.
//
//  Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
//
//  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
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

#if canImport(UIKit)
import UIKit
import XCTest
@testable import Kingfisher

class UIButtonExtensionTests: XCTestCase {

    var button: UIButton!
    
    override class func setUp() {
        super.setUp()
        LSNocilla.sharedInstance().start()
    }
    
    override class func tearDown() {
        LSNocilla.sharedInstance().stop()
        super.tearDown()
    }
    
    override func setUp() {
        super.setUp()
        button = UIButton()
        KingfisherManager.shared.downloader = ImageDownloader(name: "testDownloader")
        KingfisherManager.shared.defaultOptions = [.waitForCache]
        
        cleanDefaultCache()
    }
    
    override func tearDown() {
        LSNocilla.sharedInstance().clearStubs()
        button = nil
        cleanDefaultCache()
        KingfisherManager.shared.defaultOptions = .empty
        super.tearDown()
    }

    func testDownloadAndSetImage() {
        let exp = expectation(description: #function)
        let url = testURLs[0]
        stub(url, data: testImageData, length: 123)

        var progressBlockIsCalled = false

        KF.url(url)
            .onProgress { _, _ in
                progressBlockIsCalled = true
            }
            .onSuccess { result in
                XCTAssertTrue(progressBlockIsCalled)

                XCTAssertTrue(result.image.renderEqual(to: testImage))
                XCTAssertTrue(self.button.image(for: .normal)!.renderEqual(to: testImage))

                XCTAssertEqual(result.cacheType, .none)

                exp.fulfill()
            }
            .set(to: button, for: .normal)

        waitForExpectations(timeout: 3, handler: nil)
    }
    
    func testDownloadAndSetBackgroundImage() {
        let exp = expectation(description: #function)
        let url = testURLs[0]
        stub(url, data: testImageData, length: 123)
        
        var progressBlockIsCalled = false
        KF.url(url)
            .onProgress { _, _ in
                progressBlockIsCalled = true
            }
            .onSuccess { result in
                XCTAssertTrue(progressBlockIsCalled)

                XCTAssertTrue(result.image.renderEqual(to: testImage))
                XCTAssertTrue(self.button.backgroundImage(for: .normal)!.renderEqual(to: testImage))

                XCTAssertEqual(result.cacheType, .none)

                exp.fulfill()
            }
            .setBackground(to: button, for: .normal)
        waitForExpectations(timeout: 3, handler: nil)
    }
    
    func testCacnelImageTask() {
        let exp = expectation(description: #function)
        let url = testURLs[0]
        let stub = delayedStub(url, data: testImageData)

        KF.url(url)
            .onFailure { error in
                XCTAssertTrue(error.isTaskCancelled)
                delay(0.1) { exp.fulfill() }
            }
            .set(to: button, for: .highlighted)
        
        self.button.kf.cancelImageDownloadTask()
        _ = stub.go()

        waitForExpectations(timeout: 3, handler: nil)
    }
    
    func testCacnelBackgroundImageTask() {
        let exp = expectation(description: #function)
        let url = testURLs[0]
        let stub = delayedStub(url, data: testImageData)

        KF.url(url)
            .onFailure { error in
                XCTAssertTrue(error.isTaskCancelled)
                delay(0.1) { exp.fulfill() }
            }
            .setBackground(to: button, for: .highlighted)
        
        self.button.kf.cancelBackgroundImageDownloadTask()
        _ = stub.go()
        
        waitForExpectations(timeout: 3, handler: nil)
    }
    
    func testSettingNilURL() {
        let exp = expectation(description: #function)
        
        let url: URL? = nil
        button.kf.setBackgroundImage(with: url, for: .normal, completionHandler:  { result in
            XCTAssertNil(result.value)
            XCTAssertNotNil(result.error)
            guard case .imageSettingError(reason: .emptySource) = result.error! else {
                XCTFail()
                return
            }
            exp.fulfill()
        })
        
        waitForExpectations(timeout: 3, handler: nil)
    }
    
    func testSettingNonWorkingImageWithFailureImage() {
        let expectation = self.expectation(description: "wait for downloading image")
        let url = testURLs[0]
        stub(url, errorCode: 404)
        let state = UIControl.State()

        KF.url(url)
            .onFailureImage(testImage)
            .onFailure { error in
                XCTAssertEqual(testImage, self.button.image(for: state))
                expectation.fulfill()
            }
            .set(to: button, for: state)
        XCTAssertNil(button.image(for: state))
        waitForExpectations(timeout: 5, handler: nil)
    }
    
    func testSettingNonWorkingBackgroundImageWithFailureImage() {
        let expectation = self.expectation(description: "wait for downloading image")
        let url = testURLs[0]
        stub(url, errorCode: 404)
        let state = UIControl.State()

        KF.url(url)
            .onFailureImage(testImage)
            .onFailure { error in
                XCTAssertEqual(testImage, self.button.backgroundImage(for: state))
                expectation.fulfill()
            }
            .setBackground(to: button, for: state)

        XCTAssertNil(button.backgroundImage(for: state))
        waitForExpectations(timeout: 5, handler: nil)

    }
}
#endif