diff -r 1baa7c6bd370 -r 3079cbf80006 server/src/tests/Models/DocumentTest.php
--- a/server/src/tests/Models/DocumentTest.php	Thu Mar 03 17:34:12 2016 +0100
+++ b/server/src/tests/Models/DocumentTest.php	Fri Mar 04 10:08:52 2016 +0100
@@ -125,6 +125,24 @@
 
     }
 
+    public function testSetModified() {
+        $currentTime = gmdate(DateTime::ATOM);
+        $doc = new Document("http://corpusdelaparole.huma-num.fr/corpus/res/crdo-CFPP2000_35_SOUND", $this->graph);
+        $doc->setModified($currentTime);
+        $this->assertInstanceOf(EasyRdf\Literal::class, $doc->getModified(), "Modified must be a literal");
+        $this->assertEquals("http://purl.org/dc/terms/W3CDTF", $doc->getModified()->getDatatypeURI(), "type must be http://purl.org/dc/terms/W3CDTF");
+        $this->assertEquals(preg_replace('/[\+\-]00(\:?)00$/', 'Z', $currentTime), $doc->getModified()->getValue(), "modified must be $currentTime");
+    }
+
+    public function testSetModifiedNull() {
+        $doc = new Document("http://corpusdelaparole.huma-num.fr/corpus/res/crdo-CFPP2000_35_SOUND", $this->graph);
+        $doc->setModified();
+        $this->assertInstanceOf(EasyRdf\Literal::class, $doc->getModified(), "Modified must be a literal");
+        $this->assertEquals("http://purl.org/dc/terms/W3CDTF", $doc->getModified()->getDatatypeURI(), "type must be http://purl.org/dc/terms/W3CDTF");
+        $foundDateTime = \DateTime::createFromFormat(\DateTime::ATOM, $doc->getModified()->getValue());
+        $nowUTC = new \DateTime('now', new \DateTimeZone("UTC"));
+        $this->assertTrue($nowUTC->getTimestamp() -  $foundDateTime->getTimestamp() < 2, "must have less than 2 seconds diff");
+    }
 
     public function testPublisher() {
 
@@ -431,7 +449,7 @@
 
         $subjects = $doc->getSubjects();
 
-        $this->assertCount(28, $subjects, "Must have 15 subjects");
+        $this->assertCount(28, $subjects, "Must have 28 subjects");
 
         foreach ($doc->getSubjects() as $s) {
             $this->assertThat(
@@ -444,4 +462,42 @@
         }
     }
 
+    public function testSetSubjects() {
+        $doc = new Document("http://corpusdelaparole.huma-num.fr/corpus/res/crdo-CFPP2000_35_SOUND", $this->graph);
+
+        $newSubjects = [
+            "http://ark.bnf.fr/ark:/12148/cb13318415c",
+            "http://ark.bnf.fr/ark:/12148/cb133188907",
+            "http://ark.bnf.fr/ark:/12148/cb11932762f",
+            "http://ark.bnf.fr/ark:/12148/cb133183660",
+            "http://ark.bnf.fr/ark:/12148/cb122368540",
+            "http://ark.bnf.fr/ark:/12148/cb119418302",
+            "http://ark.bnf.fr/ark:/12148/cb135540729",
+            "http://ark.bnf.fr/ark:/12148/cb133192210",
+            "http://ark.bnf.fr/ark:/12148/cb119377452",
+            "http://ark.bnf.fr/ark:/12148/cb13320451h",
+            "http://ark.bnf.fr/ark:/12148/cb13318422n",
+            "http://ark.bnf.fr/ark:/12148/cb11975823c"
+        ];
+
+        $doc->setSubjects($newSubjects);
+
+        $this->assertTrue($doc->isDirty(), "The document must have changed");
+
+        $subjects = $doc->getSubjects();
+
+        $this->assertCount(12, $subjects, "Must have 12 subjects");
+
+        foreach ($doc->getSubjects() as $s) {
+            $this->assertInstanceOf('EasyRdf\Resource', $s, "Mustbe a Resource");
+            $this->assertTrue(strrpos($s->getUri(), "http://ark.bnf.fr/ark:/12148/cb") === 0, "Must start with http://ark.bnf.fr/ark:/12148/cb");
+            $this->assertContains($s->getUri(), $newSubjects, "$s must be in new subjects list");
+            if(($key = array_search($s->getUri(), $newSubjects)) !== false) {
+                unset($newSubjects[$key]);
+            }
+        }
+        $this->assertEmpty($newSubjects, "all subjects must have been removed");
+    }
+
+
 }