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Test already in:

tests/src/python/test_qgsserver_wms_getfeatureinfo.py

@unittest.expectedFailure

    # TODO make GetFeatureInfo show the dictionary values and enable test
    @unittest.expectedFailure
    def testGetFeatureInfoValueRelationArray(self):
        """Test GetFeatureInfo on "value relation" widget with array field (multiple selections)""" 
        mypath = self.testdata_path + "test_project_values.qgz" 
        self.wms_request_compare('GetFeatureInfo',
                                 '&layers=layer3&styles=&' +
                                 'VERSION=1.3.0&' +
                                 'info_format=text%2Fxml&' +
                                 'width=926&height=787&srs=EPSG%3A4326' +
                                 '&bbox=912217,5605059,914099,5606652' +
                                 '&CRS=EPSG:3857' +
                                 '&FEATURE_COUNT=10' +
                                 '&WITH_GEOMETRY=True' +
                                 '&QUERY_LAYERS=layer3&I=487&J=308',
                                 'wms_getfeatureinfo-values3-text-xml',
                                 'test_project_values.qgz')

Would have expected to get as a response the values from the array:

*****
Content-Type: text/xml; charset=utf-8

<GetFeatureInfoResponse>
...
  <Feature id="1">
   <Attribute value="1" name="id"/>
   <Attribute value="Id no. 1 value, Id no. 2 value, Id número 3 value" name="location"/>
...

but the server outputs:

...
  <Feature id="1">
   <Attribute value="1" name="id"/>
   <Attribute value=""/>
...