diff --git a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
index ffcc3fe..60e5f4d 100644
--- a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
+++ b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
@@ -33,28 +33,28 @@ protected function setUp() {
    */
   public function testBook() {
     $nodes = Node::loadMultiple(array(4, 5, 6, 7, 8));
-    $this->assertIdentical('4', $nodes[4]->book['bid']);
-    $this->assertIdentical('0', $nodes[4]->book['pid']);
+    $this->assertSame('4', $nodes[4]->book['bid']);
+    $this->assertSame('0', $nodes[4]->book['pid']);
 
-    $this->assertIdentical('4', $nodes[5]->book['bid']);
-    $this->assertIdentical('4', $nodes[5]->book['pid']);
+    $this->assertSame('4', $nodes[5]->book['bid']);
+    $this->assertSame('4', $nodes[5]->book['pid']);
 
-    $this->assertIdentical('4', $nodes[6]->book['bid']);
-    $this->assertIdentical('5', $nodes[6]->book['pid']);
+    $this->assertSame('4', $nodes[6]->book['bid']);
+    $this->assertSame('5', $nodes[6]->book['pid']);
 
-    $this->assertIdentical('4', $nodes[7]->book['bid']);
-    $this->assertIdentical('5', $nodes[7]->book['pid']);
+    $this->assertSame('4', $nodes[7]->book['bid']);
+    $this->assertSame('5', $nodes[7]->book['pid']);
 
-    $this->assertIdentical('8', $nodes[8]->book['bid']);
-    $this->assertIdentical('0', $nodes[8]->book['pid']);
+    $this->assertSame('8', $nodes[8]->book['bid']);
+    $this->assertSame('0', $nodes[8]->book['pid']);
 
     $tree = \Drupal::service('book.manager')->bookTreeAllData(4);
-    $this->assertIdentical('4', $tree['49990 Node 4 4']['link']['nid']);
-    $this->assertIdentical('5', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['link']['nid']);
-    $this->assertIdentical('6', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 6 6']['link']['nid']);
-    $this->assertIdentical('7', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 7 7']['link']['nid']);
-    $this->assertIdentical(array(), $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 6 6']['below']);
-    $this->assertIdentical(array(), $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 7 7']['below']);
+    $this->assertSame('4', $tree['49990 Node 4 4']['link']['nid']);
+    $this->assertSame('5', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['link']['nid']);
+    $this->assertSame('6', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 6 6']['link']['nid']);
+    $this->assertSame('7', $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 7 7']['link']['nid']);
+    $this->assertSame(array(), $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 6 6']['below']);
+    $this->assertSame(array(), $tree['49990 Node 4 4']['below']['50000 Node 5 5']['below']['50000 Node 7 7']['below']);
   }
 
 }