diff -r cf0f23803a53 -r 2dba812c7ef2 server/src/tests/Controllers/DateStatsControllerTest.php
--- a/server/src/tests/Controllers/DateStatsControllerTest.php	Wed Nov 09 15:05:41 2016 +0100
+++ b/server/src/tests/Controllers/DateStatsControllerTest.php	Wed Nov 09 23:41:15 2016 +0100
@@ -6,29 +6,34 @@
 
 class DateStatsControllerTest extends TestCase
 {
-    const ES_QUERY = [
-        'index' => 'corpus',
-        'body' => [
-            "size" => 0,
-            "query" => [ "match_all" => [] ],
-            "aggs" => [
-                "datestats" => [
-                    "nested"=> [
-                        "path" => "creation_years"
-                    ],
-                    "aggs" => [
-                        "years" => [
-                            "terms"=> [
-                                "field" => "creation_years.year",
-                                "size" => 0,
-                                "order" => [
-                                    "_term" => "asc"
-                                ]
-                            ],
-                            "aggs" => [
-                                "year_count" => [
-                                    "sum" => [
-                                        "field" => "creation_years.weight"
+    private $ES_QUERY;
+
+    public function setUp() {
+        parent::setup();
+        $this->ES_QUERY = [
+            'index' => 'corpus',
+            'body' => [
+                "size" => 0,
+                "query" => [ "match_all" => (object) null ],
+                "aggs" => [
+                    "datestats" => [
+                        "nested"=> [
+                            "path" => "creation_years"
+                        ],
+                        "aggs" => [
+                            "years" => [
+                                "terms"=> [
+                                    "field" => "creation_years.year",
+                                    "size" => 2147483647,
+                                    "order" => [
+                                        "_term" => "asc"
+                                    ]
+                                ],
+                                "aggs" => [
+                                    "year_count" => [
+                                        "sum" => [
+                                            "field" => "creation_years.weight"
+                                        ]
                                     ]
                                 ]
                             ]
@@ -36,12 +41,7 @@
                     ]
                 ]
             ]
-        ]
-    ];
-
-    public function setUp() {
-
-        parent::setup();
+        ];
     }
 
     public function tearDown() {
@@ -54,7 +54,7 @@
 
         Es::shouldReceive('search')
                 ->once()
-                ->with(self::ES_QUERY)
+                ->with($this->ES_QUERY)
                 ->andReturn(json_decode('{
                     "took" : 132,
                     "timed_out" : false,
@@ -87,7 +87,7 @@
 
         Es::shouldReceive('search')
                 ->once()
-                ->with(self::ES_QUERY)
+                ->with($this->ES_QUERY)
                 ->andReturn(json_decode('{
                     "took" : 132,
                     "timed_out" : false,