diff --git a/tests/integration/features/bootstrap/FeatureContext.php b/tests/integration/features/bootstrap/FeatureContext.php
index 5dc2db47bb4..5d7e7318664 100644
--- a/tests/integration/features/bootstrap/FeatureContext.php
+++ b/tests/integration/features/bootstrap/FeatureContext.php
@@ -573,6 +573,37 @@ public function userSeesTheFollowingSystemMessagesInRoom($user, $identifier, $st
 		}, $messages));
 	}
 
+	/**
+	 * @Then /^user "([^"]*)" gets the following candidate mentions in room "([^"]*)" for "([^"]*)" with (\d+)$/
+	 *
+	 * @param string $user
+	 * @param string $identifier
+	 * @param string $search
+	 * @param string $statusCode
+	 * @param TableNode|null $formData
+	 */
+	public function userGetsTheFollowingCandidateMentionsInRoomFor($user, $identifier, $search, $statusCode, TableNode $formData = null) {
+		$this->setCurrentUser($user);
+		$this->sendRequest('GET', '/apps/spreed/api/v1/chat/' . self::$identifierToToken[$identifier] . '/mentions?search=' . $search);
+		$this->assertStatusCode($this->response, $statusCode);
+
+		$mentions = $this->getDataFromResponse($this->response);
+
+		if ($formData === null) {
+			PHPUnit_Framework_Assert::assertEmpty($mentions);
+			return;
+		}
+
+		PHPUnit_Framework_Assert::assertCount(count($formData->getHash()), $mentions, 'Mentions count does not match');
+		PHPUnit_Framework_Assert::assertEquals($formData->getHash(), array_map(function($mention) {
+			return [
+				'id' => (string) $mention['id'],
+				'label' => (string) $mention['label'],
+				'source' => (string) $mention['source'],
+			];
+		}, $mentions));
+	}
+
 	/**
 	 * Parses the xml answer to get the array of users returned.
 	 * @param ResponseInterface $response
diff --git a/tests/integration/features/chat/mentions.feature b/tests/integration/features/chat/mentions.feature
new file mode 100644
index 00000000000..c09a038ad86
--- /dev/null
+++ b/tests/integration/features/chat/mentions.feature
@@ -0,0 +1,185 @@
+Feature: chat/mentions
+
+  Background:
+    Given user "participant1" exists
+    Given user "participant2" exists
+    Given user "participant3" exists
+    Given user "participant4" exists
+
+  Scenario: get mentions in a one-to-one room
+    When user "participant1" creates room "one-to-one room"
+      | roomType | 1 |
+      | invite   | participant2 |
+    Then user "participant1" gets the following candidate mentions in room "one-to-one room" for "" with 200
+      | id           | label                    | source |
+      | participant2 | participant2-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "one-to-one room" for "" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+
+  Scenario: get matched mentions in a one-to-one room
+    When user "participant1" creates room "one-to-one room"
+      | roomType | 1 |
+      | invite   | participant2 |
+    Then user "participant1" gets the following candidate mentions in room "one-to-one room" for "part" with 200
+      | id           | label                    | source |
+      | participant2 | participant2-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "one-to-one room" for "part" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+
+  Scenario: get unmatched mentions in a one-to-one room
+    When user "participant1" creates room "one-to-one room"
+      | roomType | 1 |
+      | invite   | participant2 |
+    Then user "participant1" gets the following candidate mentions in room "one-to-one room" for "unknown" with 200
+    And user "participant2" gets the following candidate mentions in room "one-to-one room" for "unknown" with 200
+
+  Scenario: get mentions in a one-to-one room with a participant not in the room
+    When user "participant1" creates room "one-to-one room"
+      | roomType | 1 |
+      | invite   | participant2 |
+    Then user "participant3" gets the following candidate mentions in room "one-to-one room" for "" with 404
+
+
+
+  Scenario: get mentions in a group room with no other participant
+    When user "participant1" creates room "group room"
+      | roomType | 2 |
+      | roomName | room |
+    Then user "participant1" gets the following candidate mentions in room "group room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+
+  Scenario: get mentions in a group room
+    When user "participant1" creates room "group room"
+      | roomType | 2 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "group room" with 200
+    And user "participant1" adds "participant3" to room "group room" with 200
+    Then user "participant1" gets the following candidate mentions in room "group room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant2 | participant2-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "group room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant1 | participant1-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant3" gets the following candidate mentions in room "group room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant1 | participant1-displayname | users  |
+      | participant2 | participant2-displayname | users  |
+
+  Scenario: get matched mentions in a group room
+    When user "participant1" creates room "group room"
+      | roomType | 2 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "group room" with 200
+    And user "participant1" adds "participant3" to room "group room" with 200
+    Then user "participant1" gets the following candidate mentions in room "group room" for "part" with 200
+      | id           | label                    | source |
+      | participant2 | participant2-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "group room" for "part" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant3" gets the following candidate mentions in room "group room" for "part" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+      | participant2 | participant2-displayname | users  |
+
+  Scenario: get unmatched mentions in a group room
+    When user "participant1" creates room "group room"
+      | roomType | 2 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "group room" with 200
+    And user "participant1" adds "participant3" to room "group room" with 200
+    Then user "participant1" gets the following candidate mentions in room "group room" for "unknown" with 200
+    And user "participant2" gets the following candidate mentions in room "group room" for "unknown" with 200
+    And user "participant3" gets the following candidate mentions in room "group room" for "unknown" with 200
+
+  Scenario: get mentions in a group room with a participant not in the room
+    When user "participant1" creates room "group room"
+      | roomType | 2 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "group room" with 200
+    And user "participant1" adds "participant3" to room "group room" with 200
+    Then user "participant4" gets the following candidate mentions in room "group room" for "" with 404
+
+
+
+  Scenario: get mentions in a public room with no other participant
+    When user "participant1" creates room "public room"
+      | roomType | 3 |
+      | roomName | room |
+    Then user "participant1" gets the following candidate mentions in room "public room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+
+  Scenario: get mentions in a public room
+    When user "participant1" creates room "public room"
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "public room" with 200
+    And user "participant3" joins room "public room" with 200
+    And user "guest" joins room "public room" with 200
+    Then user "participant1" gets the following candidate mentions in room "public room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant2 | participant2-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "public room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant1 | participant1-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant3" gets the following candidate mentions in room "public room" for "" with 200
+      | id           | label                    | source |
+      | all          | room                     | calls  |
+      | participant1 | participant1-displayname | users  |
+      | participant2 | participant2-displayname | users  |
+
+  Scenario: get matched mentions in a public room
+    When user "participant1" creates room "public room"
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "public room" with 200
+    And user "participant3" joins room "public room" with 200
+    And user "guest" joins room "public room" with 200
+    Then user "participant1" gets the following candidate mentions in room "public room" for "part" with 200
+      | id           | label                    | source |
+      | participant2 | participant2-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant2" gets the following candidate mentions in room "public room" for "part" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+      | participant3 | participant3-displayname | users  |
+    And user "participant3" gets the following candidate mentions in room "public room" for "part" with 200
+      | id           | label                    | source |
+      | participant1 | participant1-displayname | users  |
+      | participant2 | participant2-displayname | users  |
+
+  Scenario: get unmatched mentions in a public room
+    When user "participant1" creates room "public room"
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "public room" with 200
+    And user "participant3" joins room "public room" with 200
+    And user "guest" joins room "public room" with 200
+    Then user "participant1" gets the following candidate mentions in room "public room" for "unknown" with 200
+    And user "participant2" gets the following candidate mentions in room "public room" for "unknown" with 200
+    And user "participant3" gets the following candidate mentions in room "public room" for "unknown" with 200
+
+  Scenario: get mentions in a public room with a participant not in the room
+    When user "participant1" creates room "public room"
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds "participant2" to room "public room" with 200
+    And user "participant3" joins room "public room" with 200
+    And user "guest" joins room "public room" with 200
+    Then user "participant4" gets the following candidate mentions in room "public room" for "" with 404
+    And user "guest2" gets the following candidate mentions in room "public room" for "" with 404