diff -r b64c8c35c67d -r d2e6ee099125 server/src/tests/Controllers/DateStatsControllerTest.php
--- a/server/src/tests/Controllers/DateStatsControllerTest.php	Sat Jun 10 22:43:58 2017 +0200
+++ b/server/src/tests/Controllers/DateStatsControllerTest.php	Mon Jun 12 14:53:59 2017 +0200
@@ -102,8 +102,10 @@
                         }
                     }
                 }', true));
-            $this->get('/api/v1/stats/datestats/')->assertTrue($this->response->isOk(), $this->response->content());
-            $this->seeJsonEquals(["datestats" => []]);
+            $response = $this->get('/api/v1/stats/datestats/');
+            $response
+                ->assertStatus(200)
+                ->assertJson(["datestats" => []]);
     }
 
     public function testIndexResult() {
@@ -159,8 +161,10 @@
                         }
                     }
                 }', true));
-            $this->get('/api/v1/stats/datestats/')->assertTrue($this->response->isOk(), $this->response->content());
-            $this->seeJsonEquals(["datestats" => [
+            $response = $this->get('/api/v1/stats/datestats/');
+            $response
+                ->assertStatus(200)
+                ->assertJson(["datestats" => [
                 "1948" => 3,
                 "1957" => 29,
                 "1963" => 22,
@@ -201,8 +205,10 @@
                         }
                     }
                 }', true));
-        $this->get('/api/v1/stats/dateminmax/')->assertTrue($this->response->isOk(), $this->response->content());
-        $this->seeJsonEquals(["dateminmax" => [0, 0]]);
+        $response = $this->get('/api/v1/stats/dateminmax/');
+        $response
+            ->assertStatus(200)
+            ->assertJson(["dateminmax" => [0, 0]]);
     }
 
     public function testMinMaxResult() {
@@ -235,8 +241,10 @@
                         }
                     }
                 }', true));
-        $this->get('/api/v1/stats/dateminmax/')->assertTrue($this->response->isOk(), $this->response->content());
-        $this->seeJsonEquals(["dateminmax" => [ 1948, 2015 ]]);
+        $response = $this->get('/api/v1/stats/dateminmax/');
+        $response
+            ->assertStatus(200)
+            ->assertJson(["dateminmax" => [ 1948, 2015 ]]);
     }
 
 }