[12.x] Document assertRedirectBackWithErrors and assertRedirectBackWithoutErrors

http-tests.md

@@ -1005,6 +1005,8 @@ Laravel's `Illuminate\Testing\TestResponse` class provides a variety of custom a
 [assertPlainCookie](#assert-plain-cookie)
 [assertRedirect](#assert-redirect)
 [assertRedirectBack](#assert-redirect-back)
+[assertRedirectBackWithErrors](#assert-redirect-back-with-errors)
+[assertRedirectBackWithoutErrors](#assert-redirect-back-without-errors)
 [assertRedirectContains](#assert-redirect-contains)
 [assertRedirectToRoute](#assert-redirect-to-route)
 [assertRedirectToSignedRoute](#assert-redirect-to-signed-route)
@@ -1561,6 +1563,26 @@ Assert whether the response is redirecting back to the previous page:
 $response->assertRedirectBack();
 ```
 
+<a name="assert-redirect-back-with-errors"></a>
+#### assertRedirectBackWithErrors
+
+Assert whether the response is redirecting back to the previous page with the given errors in the session. This method accepts the same parameters as [assertSessionHasErrors](#assert-session-has-errors):
+
+```php
+$response->assertRedirectBackWithErrors(
+    array $keys = [], $format = null, $errorBag = 'default'
+);
+```
+
+<a name="assert-redirect-back-without-errors"></a>
+#### assertRedirectBackWithoutErrors
+
+Assert whether the response is redirecting back to the previous page with no errors in the session:
+
+```php
+$response->assertRedirectBackWithoutErrors();
+```
+
 <a name="assert-redirect-contains"></a>
 #### assertRedirectContains