From a56340c08bfd5489401341338b3d4b7c31dfb3ce Mon Sep 17 00:00:00 2001
From: keisukeYamagishi <jam330257@gmail.com>
Date: Sat, 17 Aug 2024 18:31:16 +0900
Subject: [PATCH] Add a didFailProvisionalNavigation observer.

---
 RxCocoa/iOS/WKWebView+Rx.swift             | 11 +++++++++++
 Tests/RxCocoaTests/WKWebView+RxTests.swift | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/RxCocoa/iOS/WKWebView+Rx.swift b/RxCocoa/iOS/WKWebView+Rx.swift
index 6332fae74..71b6dffda 100644
--- a/RxCocoa/iOS/WKWebView+Rx.swift
+++ b/RxCocoa/iOS/WKWebView+Rx.swift
@@ -52,6 +52,17 @@ extension Reactive where Base: WKWebView {
                 )
             }
     }
+
+    public var didFailProvisionalNavigation: Observable<(WKNavigation, Error)> {
+        navigationDelegate
+            .methodInvoked(#selector(WKNavigationDelegate.webView(_:didFailProvisionalNavigation:withError:)))
+            .map { a in
+                (
+                    try castOrThrow(WKNavigation.self,a[1]),
+                    try castOrThrow(Error.self, a[2])
+                )
+            }
+        }
 }
 
 #endif
diff --git a/Tests/RxCocoaTests/WKWebView+RxTests.swift b/Tests/RxCocoaTests/WKWebView+RxTests.swift
index 7516709f9..36c7afeb9 100644
--- a/Tests/RxCocoaTests/WKWebView+RxTests.swift
+++ b/Tests/RxCocoaTests/WKWebView+RxTests.swift
@@ -90,6 +90,22 @@ final class WKWebViewTests: RxTest {
         XCTAssertEqual(expectedError, error as? MockError)
         subscription.dispose()
     }
+
+    func testdidFailProvisionalNavigation() {
+        let expectedNavigation = SafeWKNavigation()
+        let expexctedError = MockError.error("Something went wrong！")
+        let webView = WKWebView(frame: .zero)
+        var navigation: WKNavigation?
+        var error: Error?
+        let subscription = webView.rx.didFailProvisionalNavigation.subscribe { (nav, err) in
+            navigation = nav
+            error = err
+        }
+        webView.navigationDelegate!.webView?(webView, didFailProvisionalNavigation: expectedNavigation, withError:expexctedError)
+        XCTAssertEqual(expectedNavigation, navigation)
+        XCTAssertEqual(expexctedError, error as? MockError)
+        subscription.dispose()
+    }
 }
 
 // MARK: - Test Helpers