diff -r 02f113d43f18 -r 52169c718513 server/src/tests/Controllers/LanguageControllerTest.php
--- a/server/src/tests/Controllers/LanguageControllerTest.php	Thu Oct 20 15:09:31 2016 +0200
+++ b/server/src/tests/Controllers/LanguageControllerTest.php	Thu Oct 20 17:27:36 2016 +0200
@@ -11,16 +11,21 @@
  */
 class LanguageControllerTest extends TestCase {
 
-    private $sparqlClient;
+    const ES_QUERY = [
+        'index' => 'corpus',
+        'body' => [
+            "size" => 0,
+            "query" => [ "match_all" => [] ],
+            "aggs" => [
+                "languages" => [
+                    "terms" => [ "field" => "language", "order" => [ "_count" => "desc" ], "size" => 0 ]
+                ]
+            ]
+        ]
+    ];
 
     public function setUp() {
-
         parent::setup();
-
-        // create a mock of the post repository interface and inject it into the
-        // IoC container
-        $this->sparqlClient = m::mock('CorpusParole\Libraries\Sparql\SparqlClient');
-        $this->app->instance('CorpusParole\Libraries\Sparql\SparqlClient', $this->sparqlClient);
     }
 
     public function tearDown() {
@@ -29,27 +34,46 @@
     }
 
     public function testIndex() {
-        $query = "select ?lang (count(?lang) as ?count) where {
-            ?s a <http://www.europeana.eu/schemas/edm/ProvidedCHO>.
-            ?s <http://purl.org/dc/elements/1.1/language> ?lang
-        }
-        GROUP BY ?lang
-        ORDER BY DESC(?count)";
 
-        $this->sparqlClient
-            ->shouldReceive('query')
-            ->with($query)
-            ->once()
-            ->andReturn(new \ArrayIterator([
-                (object)['lang'=>new Resource('http://lexvo.org/id/iso639-3/gsw'), 'count' => Literal::create(44)],
-                (object)['lang'=>new Resource('http://lexvo.org/id/iso639-3/fra'), 'count' => Literal::create(33)],
-                (object)['lang'=>new Resource('http://lexvo.org/id/iso639-3/bre'), 'count' => Literal::create(22)],
-            ]));
-        $response = $this->get('/api/v1/stats/languages/')->
-            seeJsonEquals(['languages' => [
-                'http://lexvo.org/id/iso639-3/gsw' => 44,
-                'http://lexvo.org/id/iso639-3/fra' => 33,
-                'http://lexvo.org/id/iso639-3/bre' => 22,
+        Es::shouldReceive('search')
+                ->once()
+                ->with(self::ES_QUERY)
+                ->andReturn(json_decode('{
+    "took": 92,
+    "timed_out": false,
+    "_shards": {
+        "total": 1,
+        "successful": 1,
+        "failed": 0
+    },
+    "hits": {
+        "total": 3373,
+        "max_score": 0.0,
+        "hits": []
+    },
+    "aggregations": {
+        "languages": {
+            "doc_count_error_upper_bound": 0,
+            "sum_other_doc_count": 0,
+            "buckets": [{
+                "key": "http://lexvo.org/id/iso639-3/fra",
+                "doc_count": 1669
+            }, {
+                "key": "http://lexvo.org/id/iso639-3/gsw",
+                "doc_count": 851
+            }, {
+                "key": "http://lexvo.org/id/iso639-3/bre",
+                "doc_count": 403
+            }]
+        }
+    }
+}', true));
+
+        $response = $this->get('/api/v1/stats/languages/')->assertTrue($this->response->isOk(), $this->response->content());
+        $this->seeJsonEquals(['languages' => [
+                'http://lexvo.org/id/iso639-3/fra' => 1669,
+                'http://lexvo.org/id/iso639-3/gsw' => 851,
+                'http://lexvo.org/id/iso639-3/bre' => 403,
             ]]);
     }
 }