test(integration): Add integration test for accept share

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

build/integration/features/bootstrap/Sharing.php

@@ -97,6 +97,15 @@ public function creatingShare($body) {
 		$this->asCreatingAShareWith($this->currentUser, $body);
 	}
 
+	/**
+	 * @When /^accepting last share via the accept endpoint$/
+	 */
+	public function acceptingLastShareViaAcceptEndpoint(): void {
+		$share_id = $this->lastShareData->data[0]->id;
+		$url = "/index.php/apps/files_sharing/accept/ocinternal:$share_id";
+		$this->sendingToDirectUrl('GET', $url);
+	}
+
 	/**
 	 * @When /^accepting last share$/
 	 */

build/integration/sharing_features/sharing-accept.feature

@@ -0,0 +1,63 @@
+# SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+Feature: sharing-accept
+  Background:
+    Given using api version "1"
+    Given using old dav path
+
+  Scenario: Accepting a non-existent share
+    Given user "user0" exists
+    And As an "user0"
+    When sending "GET" with exact url to "/index.php/apps/files_sharing/accept/ocinternal:999999"
+    Then the HTTP status code should be "404"
+
+  Scenario: Accepting a share with an invalid share ID
+    Given user "user0" exists
+    And As an "user0"
+    When sending "GET" with exact url to "/index.php/apps/files_sharing/accept/invalid:format"
+    Then the HTTP status code should be "404"
+
+  Scenario: Accepting a valid share
+    Given user "user0" exists
+    And user "user1" exists
+    And As an "user0"
+    When creating a share with
+      | path | welcome.txt |
+      | shareWith | user1 |
+      | shareType | 0 |
+    Then the OCS status code should be "100"
+    And the HTTP status code should be "200"
+    And As an "user1"
+    When accepting last share via the accept endpoint
+    Then the HTTP status code should be "200"
+
+  Scenario: Accepting a share as a different user
+    Given user "user0" exists
+    And user "user1" exists
+    And user "user2" exists
+    And As an "user0"
+    When creating a share with
+      | path | welcome.txt |
+      | shareWith | user1 |
+      | shareType | 0 |
+    Then the OCS status code should be "100"
+    And the HTTP status code should be "200"
+    And As an "user2"
+    When accepting last share via the accept endpoint
+    Then the HTTP status code should be "404"
+
+  Scenario: Accepting a share that is not a user share
+    Given user "user0" exists
+    And user "user1" exists
+    And user "user2" exists
+    And As an "user0"
+    And User user0 created a folder drop
+    When creating a share with
+      | path | drop |
+      | shareType | 3 |
+      | publicUpload | true |
+    Then the OCS status code should be "100"
+    And the HTTP status code should be "200"
+    And As an "user2"
+    When accepting last share via the accept endpoint
+    Then the HTTP status code should be "404"