add api test for search file through tag

tests/acceptance/config/behat.yml

@@ -119,6 +119,7 @@ default:
         - TUSContext:
         - SpacesTUSContext:
         - OcisConfigContext:
+        - TagContext:
 
     apiCors:
       paths:

tests/acceptance/features/apiGraph/fullSearch.feature

@@ -0,0 +1,29 @@
+@api
+Feature: full text search
+  As a user
+  I want to do full text search
+  So that I can find the files with the content I am looking for
+
+  Background:
+    Given user "Alice" has been created with default attributes and without skeleton files
+
+
+  Scenario Outline: search files using a tag
+    Given using <dav-path-version> DAV path
+    And user "Alice" has uploaded file with content "hello world" to "file1.txt"
+    And user "Alice" has uploaded file with content "Namaste nepal" to "file2.txt"
+    And user "Alice" has uploaded file with content "hello nepal" to "file3.txt"
+    And user "Alice" has created the following tags for file "file1.txt" of the space "Personal":
+      | tag1 |
+    And user "Alice" has created the following tags for file "file2.txt" of the space "Personal":
+      | tag1 |
+    When user "Alice" searches for "Tags:tag1" using the WebDAV API
+    Then the HTTP status code should be "207"
+    And the search result of user "Alice" should contain only these files:
+      | file1.txt |
+      | file2.txt |
+    Examples:
+      | dav-path-version |
+      | old              |
+      | new              |
+      | spaces           |