diff --git a/PagingKitTests/ContentAppearanceHandlerTests.swift b/PagingKitTests/ContentAppearanceHandlerTests.swift
index 144ab5a..f7c1971 100644
--- a/PagingKitTests/ContentAppearanceHandlerTests.swift
+++ b/PagingKitTests/ContentAppearanceHandlerTests.swift
@@ -2,9 +2,25 @@
 //  ContentAppearanceHandlerTests.swift
 //  PagingKitTests
 //
-//  Created by kahayash on 2019/12/19.
-//  Copyright © 2019 Kazuhiro Hayashi. All rights reserved.
+//  Copyright (c) 2019 Kazuhiro Hayashi
 //
+//  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.
 
 import XCTest
 @testable import PagingKit
diff --git a/PagingKitTests/PagingContentViewControllerTests.swift b/PagingKitTests/PagingContentViewControllerTests.swift
index 5067773..3a6f576 100644
--- a/PagingKitTests/PagingContentViewControllerTests.swift
+++ b/PagingKitTests/PagingContentViewControllerTests.swift
@@ -28,16 +28,21 @@ import XCTest
 class PagingContentViewControllerTests: XCTestCase {
     var pagingContentViewController: PagingContentViewController?
     var dataSource: PagingContentViewControllerDataSource?
+    var contentAppearanceHandler: ContentsAppearanceHandlerSpy!
     
     override func setUp() {
         super.setUp()
+        contentAppearanceHandler = ContentsAppearanceHandlerSpy()
         pagingContentViewController = PagingContentViewController()
+        pagingContentViewController?.appearanceHandler = contentAppearanceHandler
         pagingContentViewController?.view.frame = CGRect(x: 0, y: 0, width: 320, height: 667)
     }
     
     override func tearDown() {
         super.tearDown()
         dataSource = nil
+        contentAppearanceHandler = nil
+        pagingContentViewController = nil
     }
     
     func testCallingDataSource() {
@@ -254,3 +259,110 @@ class PagingContentVcDataSourceSpy: NSObject, PagingContentViewControllerDataSou
         return vc
     }
 }
+
+// MARK:- Appearance
+extension PagingContentViewControllerTests {
+    func test_Appear_callApparance() {
+        
+        let expectation = XCTestExpectation(description: "finish reloadData")
+        let dataSource = PagingContentVcDataSourceSpy()
+        pagingContentViewController?.dataSource = dataSource
+        pagingContentViewController?.loadViewIfNeeded()
+        pagingContentViewController?.reloadData(with: 2) { [unowned self] in
+            self.pagingContentViewController?.beginAppearanceTransition(true, animated: false)
+            
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.0, .viewWillAppear)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.1, false)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.2, 2)
+            
+            self.pagingContentViewController?.endAppearanceTransition()
+            
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.0, .viewDidAppear)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.1, false)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.2, 2)
+            
+            expectation.fulfill()
+        }
+        
+        wait(for: [expectation], timeout: 0.2)
+    }
+    
+    
+    func test_Dissapear_callApparance() {
+        let expectation = XCTestExpectation(description: "finish reloadData")
+        let dataSource = PagingContentVcDataSourceSpy()
+        pagingContentViewController?.dataSource = dataSource
+        pagingContentViewController?.loadViewIfNeeded()
+        pagingContentViewController?.reloadData(with: 3) { [unowned self] in
+            self.pagingContentViewController?.beginAppearanceTransition(false, animated: false)
+            
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.0, .viewWillDisappear)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.1, false)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.2, 3)
+            
+            self.pagingContentViewController?.endAppearanceTransition()
+            
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.0, .viewDidDisappear)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.1, false)
+            XCTAssertEqual(self.contentAppearanceHandler.callApparance_args!.2, 3)
+            
+            expectation.fulfill()
+        }
+        
+        wait(for: [expectation], timeout: 0.2)
+    }
+    
+    func test_scrollAppearance() {
+        let expectation = XCTestExpectation(description: "finish reloadData")
+        let dataSource = PagingContentVcDataSourceSpy()
+        pagingContentViewController?.dataSource = dataSource
+        pagingContentViewController?.loadViewIfNeeded()
+        pagingContentViewController?.reloadData(with: 3) { [unowned self] in
+        self.pagingContentViewController!.scrollViewWillBeginDragging(self.pagingContentViewController!.scrollView)
+            self.pagingContentViewController?.scrollViewDidScroll(self.pagingContentViewController!.scrollView)
+            
+            XCTAssertEqual(self.contentAppearanceHandler.beginDragging_args, 3)
+            
+            self.pagingContentViewController?.scroll(to: 4, animated: false)
+            self.pagingContentViewController!.scrollViewDidEndDragging(self.pagingContentViewController!.scrollView, willDecelerate: false)
+            
+            
+            XCTAssertEqual(self.contentAppearanceHandler.stopScrolling_args, 4)
+            
+            expectation.fulfill()
+        }
+        
+        wait(for: [expectation], timeout: 0.2)
+    }
+}
+
+
+// MARK:- Test Double
+class ContentsAppearanceHandlerSpy: ContentsAppearanceHandlerProtocol {
+    var contentsDequeueHandler: (() -> [UIViewController?]?)?
+    
+    var beginDragging_args: Int?
+    func beginDragging(at index: Int) {
+        beginDragging_args = index
+    }
+    
+    var stopScrolling_args: Int?
+    func stopScrolling(at index: Int) {
+        stopScrolling_args = index
+    }
+    
+    var callApparance_args: (ContentsAppearanceHandler.Apperance, Bool, Int)?
+    func callApparance(_ apperance: ContentsAppearanceHandler.Apperance, animated: Bool, at index: Int) {
+        callApparance_args = (apperance, animated, index)
+    }
+    
+    var preReload_args: Int?
+    func preReload(at index: Int) {
+        preReload_args = index
+    }
+    
+    var postReload_ags: Int?
+    func postReload(at index: Int) {
+        postReload_ags = index
+    }
+}