Cover control components with screenshots tests (#51)

* APPS-7535 add snapshot tests to control components

* APPS-7535 add snapshopping image files to project

* Run swiftformat

* APPS-7535 remove unnecessary parameters

* Run swiftformat

* APPS-7535 encapsulate duplicated code

* Run swiftformat

Co-authored-by: cbarcom <cbarcom@users.noreply.github.com>

Mistica/Tests/MisticaTests/UI/ControlsTests.swift

@@ -0,0 +1,200 @@
+//
+//  ControlsTests.swift
+//
+//  Made with ❤️ by Novum
+//
+//  Copyright © 2020 Telefonica. All rights reserved.
+//
+
+import Mistica
+import SnapshotTesting
+import XCTest
+
+final class ControlsTests: XCTestCase {
+    override class func setUp() {
+        super.setUp()
+
+        isRecording = false
+    }
+
+    // MARK: - Switch Style
+
+    func testSwitchDefaultState() {
+        assertSnapshotForAllBrands(
+            as: .image,
+            viewBuilder: makeSwitchTemplate(isOn: false)
+        )
+    }
+
+    func testSwitchOnState() {
+        assertSnapshotForAllBrands(
+            as: .image,
+            viewBuilder: makeSwitchTemplate(isOn: true)
+        )
+    }
+
+    // MARK: - UISegmentedControl Style
+
+    func testSegmentedControl() {
+        assertSnapshotForAllBrands(
+            as: .image,
+            viewBuilder: makeSegmentedControlTemplate()
+        )
+    }
+
+    // MARK: - UITabBar Style
+
+    func testTabBarControl() {
+        assertSnapshotForAllBrands(
+            as: .image,
+            viewBuilder: makeTabBarTemplate()
+        )
+    }
+
+    // MARK: - UIPageControl Style
+
+    func testPageControl() {
+        assertSnapshotForAllBrands(
+            as: .image,
+            viewBuilder: makePageControlTemplate()
+        )
+    }
+
+    // MARK: - UISegmentedControl Behaviour
+
+    func testSegmentedControlChangeSelectedSegment() {
+        MisticaConfig.brandStyle = .o2
+        MisticaConfig.styleControls([.segmentedControl])
+
+        let segmentedControl = createSegmentControl()
+        segmentedControl.selectedSegmentIndex = 1
+
+        assertSnapshot(
+            matching: segmentedControl,
+            as: .image(size: segmentedControl.intrinsicContentSize),
+            named: "assertInitialState"
+        )
+
+        segmentedControl.selectedSegmentIndex = 3
+
+        assertSnapshot(
+            matching: segmentedControl,
+            as: .image(size: segmentedControl.intrinsicContentSize),
+            named: "finalState"
+        )
+    }
+
+    // MARK: - UITabBarControl Behaviour
+
+    func testTabBarControlChangeSelectedItem() {
+        MisticaConfig.brandStyle = .vivo
+        MisticaConfig.styleControls([.tabBar])
+
+        let tabBarController = createTabBarController()
+        tabBarController.selectedIndex = 1
+
+        assertSnapshot(
+            matching: tabBarController,
+            as: .image(size: CGSize(width: 420, height: 60)),
+            named: "assertInitialState"
+        )
+
+        tabBarController.selectedIndex = 2
+
+        assertSnapshot(
+            matching: tabBarController,
+            as: .image(size: CGSize(width: 420, height: 60)),
+            named: "finalState"
+        )
+    }
+
+    // MARK: - UIPageControl Behaviour
+
+    func testPageControlChangeCurrentPage() {
+        MisticaConfig.brandStyle = .o2Classic
+        MisticaConfig.styleControls([.pageControl])
+
+        let pageControl = UIPageControl()
+        pageControl.numberOfPages = 5
+        pageControl.currentPage = 3
+
+        assertSnapshot(
+            matching: pageControl,
+            as: .image(size: pageControl.intrinsicContentSize),
+            named: "assertInitialState"
+        )
+
+        pageControl.currentPage = 1
+
+        assertSnapshot(
+            matching: pageControl,
+            as: .image(size: pageControl.intrinsicContentSize),
+            named: "finalState"
+        )
+    }
+}
+
+private extension ControlsTests {
+    func makeSwitchTemplate(isOn: Bool) -> UIView {
+        MisticaConfig.styleControls([.switch])
+        let _switch = UISwitch()
+        _switch.isOn = isOn
+        return _switch
+    }
+
+    func makeSegmentedControlTemplate() -> UIView {
+        MisticaConfig.styleControls([.segmentedControl])
+
+        let segmentedControl = createSegmentControl()
+        segmentedControl.selectedSegmentIndex = 1
+
+        return segmentedControl
+    }
+
+    func makeTabBarTemplate() -> UIView {
+        MisticaConfig.styleControls([.tabBar])
+
+        let tabBarController = createTabBarController()
+        tabBarController.selectedIndex = 1
+
+        return tabBarController.view
+    }
+
+    func makePageControlTemplate() -> UIView {
+        MisticaConfig.styleControls([.pageControl])
+
+        let pageControl = UIPageControl()
+        pageControl.numberOfPages = 5
+        pageControl.currentPage = 3
+
+        return pageControl
+    }
+
+    func createSegmentControl() -> UISegmentedControl {
+        let segmentedControl = UISegmentedControl()
+        segmentedControl.insertSegment(withTitle: "Segment 1", at: 0, animated: true)
+        segmentedControl.insertSegment(withTitle: "Segment 2", at: 1, animated: true)
+        segmentedControl.insertSegment(withTitle: "Segment 3", at: 2, animated: true)
+        segmentedControl.insertSegment(withTitle: "Segment 4", at: 3, animated: true)
+
+        return segmentedControl
+    }
+
+    func createTabBarController() -> UITabBarController {
+        var tabs = [UIViewController]()
+        for i in 0 ..< 3 {
+            let tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: i)
+            tabBarItem.title = "Tab \(i)"
+
+            let viewController = UIViewController()
+            viewController.tabBarItem = tabBarItem
+
+            tabs.append(viewController)
+        }
+
+        let tabBarController = UITabBarController()
+        tabBarController.viewControllers = tabs
+
+        return tabBarController
+    }
+}