[Tests] Introducing tests for the ASTabBarController (#628)

* introducing tests for the ASTabBarController

* Update ASTabBarControllerTests.m

AsyncDisplayKit.xcodeproj/project.pbxproj

@@ -307,6 +307,7 @@
 		B350625C1B010F070018CF92 /* ASLog.h in Headers */ = {isa = PBXBuildFile; fileRef = 0516FA3B1A15563400B4EBED /* ASLog.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		B350625D1B0111740018CF92 /* Photos.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 051943141A1575670030A7D0 /* Photos.framework */; settings = {ATTRIBUTES = (Weak, ); }; };
 		B350625E1B0111780018CF92 /* AssetsLibrary.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 051943121A1575630030A7D0 /* AssetsLibrary.framework */; settings = {ATTRIBUTES = (Weak, ); }; };
+		BB5FC3D11F9C9389007F191E /* ASTabBarControllerTests.m in Sources */ = {isa = PBXBuildFile; fileRef = BB5FC3D01F9C9389007F191E /* ASTabBarControllerTests.m */; };
 		BB5FC3CE1F9BA689007F191E /* ASNavigationControllerTests.m in Sources */ = {isa = PBXBuildFile; fileRef = BB5FC3CD1F9BA688007F191E /* ASNavigationControllerTests.m */; };
 		C78F7E2B1BF7809800CDEAFC /* ASTableNode.h in Headers */ = {isa = PBXBuildFile; fileRef = B0F880581BEAEC7500D17647 /* ASTableNode.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		CC034A091E60BEB400626263 /* ASDisplayNode+Convenience.h in Headers */ = {isa = PBXBuildFile; fileRef = CC034A071E60BEB400626263 /* ASDisplayNode+Convenience.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -784,6 +785,7 @@
 		B30BF6501C5964B0004FCD53 /* ASLayoutManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ASLayoutManager.h; path = TextKit/ASLayoutManager.h; sourceTree = "<group>"; };
 		B30BF6511C5964B0004FCD53 /* ASLayoutManager.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = ASLayoutManager.m; path = TextKit/ASLayoutManager.m; sourceTree = "<group>"; };
 		B35061DA1B010EDF0018CF92 /* AsyncDisplayKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = AsyncDisplayKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		BB5FC3D01F9C9389007F191E /* ASTabBarControllerTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ASTabBarControllerTests.m; sourceTree = "<group>"; };
 		BB5FC3CD1F9BA688007F191E /* ASNavigationControllerTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ASNavigationControllerTests.m; sourceTree = "<group>"; };
 		BDC2D162BD55A807C1475DA5 /* Pods-AsyncDisplayKitTests.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-AsyncDisplayKitTests.profile.xcconfig"; path = "Pods/Target Support Files/Pods-AsyncDisplayKitTests/Pods-AsyncDisplayKitTests.profile.xcconfig"; sourceTree = "<group>"; };
 		CC034A071E60BEB400626263 /* ASDisplayNode+Convenience.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "ASDisplayNode+Convenience.h"; sourceTree = "<group>"; };
@@ -1161,6 +1163,7 @@
 				CCDD148A1EEDCD9D0020834E /* ASCollectionModernDataSourceTests.m */,
 				BB5FC3CD1F9BA688007F191E /* ASNavigationControllerTests.m */,
 				CC034A0F1E60C9BF00626263 /* ASRectTableTests.m */,
+				BB5FC3D01F9C9389007F191E /* ASTabBarControllerTests.m */,
 				CC11F9791DB181180024D77B /* ASNetworkImageNodeTests.m */,
 				CC051F1E1D7A286A006434CB /* ASCALayerTests.m */,
 				CCE4F9B21F0D60AC00062E4E /* ASIntegerMapTests.m */,
@@ -2135,6 +2138,7 @@
 				F711994E1D20C21100568860 /* ASDisplayNodeExtrasTests.m in Sources */,
 				BB5FC3CE1F9BA689007F191E /* ASNavigationControllerTests.m in Sources */,
 				ACF6ED5D1B178DC700DA7C62 /* ASDimensionTests.mm in Sources */,
+				BB5FC3D11F9C9389007F191E /* ASTabBarControllerTests.m in Sources */,
 				695BE2551DC1245C008E6EA5 /* ASWrapperSpecSnapshotTests.mm in Sources */,
 				CCA221D31D6FA7EF00AF6A0F /* ASViewControllerTests.m in Sources */,
 				058D0A38195D057000B7D73C /* ASDisplayLayerTests.m in Sources */,

Tests/ASTabBarControllerTests.m

@@ -0,0 +1,45 @@
+//
+//  ASTabBarControllerTests.m
+//  Texture
+//
+//  Copyright (c) 2017-present, Pinterest, Inc.  All rights reserved.
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import <XCTest/XCTest.h>
+#import "ASTabBarController.h"
+#import "ASViewController.h"
+
+@interface ASTabBarControllerTests: XCTestCase
+
+@end
+
+@implementation ASTabBarControllerTests
+
+- (void)testTabBarControllerSelectIndex {
+  ASViewController *firstViewController = [ASViewController new];
+  ASViewController *secondViewController = [ASViewController new];
+  NSArray *viewControllers = @[firstViewController, secondViewController];
+  ASTabBarController *tabBarController = [ASTabBarController new];
+  [tabBarController setViewControllers:viewControllers];
+  [tabBarController setSelectedIndex:1];
+  XCTAssertTrue([tabBarController.viewControllers isEqualToArray:viewControllers]);
+  XCTAssertEqual(tabBarController.selectedViewController, secondViewController);
+}
+
+- (void)testTabBarControllerSelectViewController {
+  ASViewController *firstViewController = [ASViewController new];
+  ASViewController *secondViewController = [ASViewController new];
+  NSArray *viewControllers = @[firstViewController, secondViewController];
+  ASTabBarController *tabBarController = [ASTabBarController new];
+  [tabBarController setViewControllers:viewControllers];
+  [tabBarController setSelectedViewController:secondViewController];
+  XCTAssertTrue([tabBarController.viewControllers isEqualToArray:viewControllers]);
+  XCTAssertEqual(tabBarController.selectedViewController, secondViewController);
+}
+
+@end