Tools/TestWebKitAPI/Tests/WebKit/WKBackForwardList.mm

/*
 * Copyright (C) 2016 Apple Inc. All rights reserved.
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#import "config.h"
#import "PlatformUtilities.h"
#import "Test.h"
#import "TestNavigationDelegate.h"

#import <WebKit/WKBackForwardListPrivate.h>
#import <WebKit/WKNavigationPrivate.h>
#import <WebKit/WKWebViewPrivate.h>
#import <WebKit/_WKSessionState.h>
#import <wtf/RetainPtr.h>

static NSString *loadableURL1 = @"data:text/html,no%20error%20A";
static NSString *loadableURL2 = @"data:text/html,no%20error%20B";
static NSString *loadableURL3 = @"data:text/html,no%20error%20C";

TEST(WKBackForwardList, RemoveCurrentItem)
{
    auto webView = adoptNS([[WKWebView alloc] init]);

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL1]]];
    [webView _test_waitForDidFinishNavigation];

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL2]]];
    [webView _test_waitForDidFinishNavigation];

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL3]]];
    [webView _test_waitForDidFinishNavigation];

    WKBackForwardList *list = [webView backForwardList];
    EXPECT_EQ((NSUInteger)2, list.backList.count);
    EXPECT_EQ((NSUInteger)0, list.forwardList.count);
    EXPECT_STREQ([[list.currentItem URL] absoluteString].UTF8String, loadableURL3.UTF8String);

    _WKSessionState *sessionState = [webView _sessionStateWithFilter:^BOOL(WKBackForwardListItem *item)
    {
        return [item.URL isEqual:[NSURL URLWithString:loadableURL2]];
    }];

    [webView _restoreSessionState:sessionState andNavigate:NO];

    WKBackForwardList *newList = [webView backForwardList];

    EXPECT_EQ((NSUInteger)0, newList.backList.count);
    EXPECT_EQ((NSUInteger)0, newList.forwardList.count);
    EXPECT_STREQ([[newList.currentItem URL] absoluteString].UTF8String, loadableURL2.UTF8String);
}

TEST(WKBackForwardList, CanNotGoBackAfterRestoringEmptySessionState)
{
    auto webView = adoptNS([[WKWebView alloc] init]);

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL1]]];
    [webView _test_waitForDidFinishNavigation];

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL2]]];
    [webView _test_waitForDidFinishNavigation];

    WKBackForwardList *list = [webView backForwardList];
    EXPECT_EQ(YES, [webView canGoBack]);
    EXPECT_EQ(NO, [webView canGoForward]);
    EXPECT_EQ((NSUInteger)1, list.backList.count);
    EXPECT_EQ((NSUInteger)0, list.forwardList.count);

    auto singlePageWebView = adoptNS([[WKWebView alloc] init]);

    [singlePageWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL1]]];
    [singlePageWebView _test_waitForDidFinishNavigation];

    [webView _restoreSessionState:[singlePageWebView _sessionState] andNavigate:NO];

    WKBackForwardList *newList = [webView backForwardList];

    EXPECT_EQ(NO, [webView canGoBack]);
    EXPECT_EQ(NO, [webView canGoForward]);
    EXPECT_EQ((NSUInteger)0, newList.backList.count);
    EXPECT_EQ((NSUInteger)0, newList.forwardList.count);
}

TEST(WKBackForwardList, RestoringNilSessionState)
{
    auto webView = adoptNS([[WKWebView alloc] init]);

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL1]]];
    [webView _test_waitForDidFinishNavigation];

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL2]]];
    [webView _test_waitForDidFinishNavigation];

    WKBackForwardList *list = [webView backForwardList];
    EXPECT_EQ(YES, [webView canGoBack]);
    EXPECT_EQ(NO, [webView canGoForward]);
    EXPECT_EQ((NSUInteger)1, list.backList.count);
    EXPECT_EQ((NSUInteger)0, list.forwardList.count);

    auto singlePageWebView = adoptNS([[WKWebView alloc] init]);

    [singlePageWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadableURL1]]];
    [singlePageWebView _test_waitForDidFinishNavigation];

    [webView _restoreSessionState:nil andNavigate:NO];

    WKBackForwardList *newList = [webView backForwardList];

    EXPECT_EQ(YES, [webView canGoBack]);
    EXPECT_EQ(NO, [webView canGoForward]);
    EXPECT_EQ((NSUInteger)1, newList.backList.count);
    EXPECT_EQ((NSUInteger)0, newList.forwardList.count);
}

static bool done;
static size_t navigations;

@interface AsyncPolicyDecisionDelegate : NSObject <WKNavigationDelegate, WKUIDelegate>
@end

@implementation AsyncPolicyDecisionDelegate

- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
{
    if (navigations++)
        done = true;
}

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    dispatch_async(dispatch_get_main_queue(), ^{
        decisionHandler(WKNavigationActionPolicyAllow);
    });
}

@end

TEST(WKBackForwardList, WindowLocationAsyncPolicyDecision)
{
    NSURL *simple = [[NSBundle mainBundle] URLForResource:@"simple" withExtension:@"html" subdirectory:@"TestWebKitAPI.resources"];
    NSURL *simple2 = [[NSBundle mainBundle] URLForResource:@"simple2" withExtension:@"html" subdirectory:@"TestWebKitAPI.resources"];
    auto webView = adoptNS([[WKWebView alloc] init]);
    auto delegate = adoptNS([[AsyncPolicyDecisionDelegate alloc] init]);
    [webView setNavigationDelegate:delegate.get()];
    [webView loadHTMLString:@"<script>window.location='simple.html'</script>" baseURL:simple2];
    TestWebKitAPI::Util::run(&done);
    EXPECT_STREQ(webView.get().backForwardList.currentItem.URL.absoluteString.UTF8String, simple.absoluteString.UTF8String);
}