Created a test for window.location.reload().

ios/web/navigation/window_location_inttest.mm

Index: ios/web/navigation/window_location_inttest.mm
diff --git a/ios/web/navigation/window_location_inttest.mm b/ios/web/navigation/window_location_inttest.mm
index e6d7aee417a09ab9470346fe662b8792ae44b258..b3e31d534be0f7bf7ad498715064de86463e9614 100644
--- a/ios/web/navigation/window_location_inttest.mm
+++ b/ios/web/navigation/window_location_inttest.mm
@@ -38,6 +38,7 @@
 // Button IDs used in the window.location test page.
 const char kWindowLocationAssignID[] = "location-assign";
 const char kWindowLocationReplaceID[] = "location-replace";
+const char kWindowLocationReloadID[] = "location-reload";
 
 // JavaScript functions on the window.location test page.
 NSString* const kUpdateURLScriptFormat = @"updateUrlToLoadText('%s')";
@@ -186,3 +187,17 @@ bool IsOnLoadTextVisible() {
   EXPECT_EQ(about_blank,
             navigation_manager()->GetLastCommittedItem()->GetURL());
 }
+
+// Tests that calling window.location.reload() causes an onload event to occur.
+TEST_F(WindowLocationTest, WindowLocationReload) {
+  // Tap the window.location.reload() button.
+  ExecuteBlockAndWaitForLoad(window_location_url(), ^{
+    ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(),
+                                                   kWindowLocationReloadID));
+  });
+
+  // Verify that |kOnLoadText| is displayed and that no additional
+  // NavigationItems are added.
+  EXPECT_TRUE(IsOnLoadTextVisible());
+  EXPECT_EQ(1, navigation_manager()->GetItemCount());
+}