Reload with empty navigation manager should not crash

ios/web/web_state/web_state_unittest.mm

Index: ios/web/web_state/web_state_unittest.mm
diff --git a/ios/web/web_state/web_state_unittest.mm b/ios/web/web_state/web_state_unittest.mm
index 92d8e359ffa6fbed0b8ec9c2840065cdd3c8641a..a68359f69ef60e28ad9551d9d85cc799aeb62be0 100644
--- a/ios/web/web_state/web_state_unittest.mm
+++ b/ios/web/web_state/web_state_unittest.mm
@@ -7,6 +7,7 @@
 #include "base/mac/bind_objc_block.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
+#import "ios/web/public/navigation_manager.h"
 #import "ios/web/public/test/web_test_with_web_state.h"
 
 namespace web {
@@ -74,4 +75,36 @@
   web_state()->RemoveScriptCommandCallback("test");
 }
 
+// Tests that reload with web::ReloadType::NORMAL is no-op when navigation
+// manager is empty.
+TEST_F(WebStateTest, ReloadWithNormalTypeWithEmptyNavigationManager) {
+  NavigationManager* navigation_manager = web_state()->GetNavigationManager();
+  ASSERT_FALSE(navigation_manager->GetTransientItem());
+  ASSERT_FALSE(navigation_manager->GetPendingItem());
+  ASSERT_FALSE(navigation_manager->GetLastCommittedItem());
+
+  navigation_manager->Reload(web::ReloadType::NORMAL,
+                             false /* check_for_repost */);
+
+  ASSERT_FALSE(navigation_manager->GetTransientItem());
+  ASSERT_FALSE(navigation_manager->GetPendingItem());
+  ASSERT_FALSE(navigation_manager->GetLastCommittedItem());
+}
+
+// Tests that reload with web::ReloadType::ORIGINAL_REQUEST_URL is no-op when
+// navigation manager is empty.
+TEST_F(WebStateTest, ReloadWithOriginalTypeWithEmptyNavigationManager) {
+  NavigationManager* navigation_manager = web_state()->GetNavigationManager();
+  ASSERT_FALSE(navigation_manager->GetTransientItem());
+  ASSERT_FALSE(navigation_manager->GetPendingItem());
+  ASSERT_FALSE(navigation_manager->GetLastCommittedItem());
+
+  navigation_manager->Reload(web::ReloadType::ORIGINAL_REQUEST_URL,
+                             false /* check_for_repost */);
+
+  ASSERT_FALSE(navigation_manager->GetTransientItem());
+  ASSERT_FALSE(navigation_manager->GetPendingItem());
+  ASSERT_FALSE(navigation_manager->GetLastCommittedItem());
+}
+
 }  // namespace web