diff --git a/tests/Mods/ModsReaderTest.php b/tests/Mods/ModsReaderTest.php
index b34bed2..e8556c0 100644
--- a/tests/Mods/ModsReaderTest.php
+++ b/tests/Mods/ModsReaderTest.php
@@ -787,8 +787,18 @@ public function testGetPartsForBookDocument()
         self::assertEquals('poem', $parts[0]->getType());
         self::assertNotEmpty($parts[0]->getOrder());
         self::assertEquals(1, $parts[0]->getOrder());
-
-        // TODO: implement reading of elements
+        self::assertNotEmpty($parts[0]->getDetails());
+        self::assertNotEmpty($parts[0]->getDetails()[0]->getTitles());
+        self::assertEquals('Wayfarers', $parts[0]->getDetails()[0]->getTitles()[0]->getValue());
+        self::assertNotEmpty($parts[0]->getExtents());
+        self::assertEquals('pages', $parts[0]->getExtents()[0]->getUnit());
+        self::assertEquals('97', $parts[0]->getExtents()[0]->getStart()->getValue());
+        self::assertEquals('98', $parts[0]->getExtents()[0]->getEnd()->getValue());
+        self::assertNotEmpty($parts[0]->getDates());
+        self::assertEquals('marc', $parts[0]->getDates()[0]->getEncoding());
+        self::assertEquals('1989', $parts[0]->getDates()[0]->getValue());
+        self::assertNotEmpty($parts[0]->getTexts());
+        self::assertEquals('Some random text', $parts[0]->getTexts()[0]->getValue());
     }
 
     public function testGetPartsByQueryForBookDocument()
@@ -801,8 +811,18 @@ public function testGetPartsByQueryForBookDocument()
         self::assertEquals('poem', $parts[0]->getType());
         self::assertNotEmpty($parts[0]->getOrder());
         self::assertEquals(2, $parts[0]->getOrder());
-
-        // TODO: implement reading of elements
+        $details = $parts[0]->getDetails();
+        self::assertNotEmpty($details);
+        self::assertEquals(2, count($details));
+        self::assertEquals('begin', $details[0]->getType());
+        self::assertEquals(1, $details[0]->getLevel());
+        self::assertNotEmpty($details[0]->getTitles());
+        self::assertEquals('Vagabonds', $details[0]->getTitles()[0]->getValue());
+        self::assertNotEmpty($parts[0]->getExtents());
+        self::assertEquals('pages', $parts[0]->getExtents()[0]->getUnit());
+        self::assertEquals('99', $parts[0]->getExtents()[0]->getStart()->getValue());
+        self::assertEquals('100', $parts[0]->getExtents()[0]->getEnd()->getValue());
+        self::assertEquals(2, $parts[0]->getExtents()[0]->getTotal());
     }
 
     public function testGetNoPartsByQueryForBookDocument()
diff --git a/tests/resources/mods_book.xml b/tests/resources/mods_book.xml
index 63dd3df..662fb22 100644
--- a/tests/resources/mods_book.xml
+++ b/tests/resources/mods_book.xml
@@ -148,14 +148,22 @@
             <start>97</start>
             <end>98</end>
         </extent>
+        <date encoding="marc">1989</date>
+        <text>Some random text</text>
     </part>
     <part type="poem" order="2">
-        <detail>
+        <detail type="begin" level="1">
+            <title>Vagabonds</title>
+            <caption>Vavava Gagaga Bonds</caption>
+        </detail>
+        <detail type="end" level="2">
             <title>Vagabonds</title>
+            <caption>Vavava Gagaga Bonds</caption>
         </detail>
         <extent unit="pages">
             <start>99</start>
             <end>100</end>
+            <total>2</total>
         </extent>
     </part>
     <tableOfContents displayLabel="Chapters">Bluegrass odyssey -- Hills of Tennessee -- Sassafrass -- Muddy river -- Take your shoes off Moses -- Let Smokey Mountain smoke get in your eyes -- Farewell party -- Faded love</tableOfContents>