fix unit test

tests/src/Unit/Plugin/migrate/source/CSVUnitTest.php

@@ -156,7 +156,7 @@ EOD;
     $this->assertEquals(count($expected), iterator_count($iterator));
     $iterator = $csv->initializeIterator();
     foreach ($expected as $record) {
-      $this->assertArrayEquals($record, $iterator->current());
+      $this->assertSame($record, $iterator->current());
       $iterator->next();
     }
 
@@ -314,7 +314,7 @@ EOD;
    */
   public function testGetIds(array $configuration, array $expected): void {
     $csv = new CSV($configuration + ['path' => $this->standardCharsPath], $this->pluginId, $this->pluginDefinition, $this->migration);
-    $this->assertArrayEquals($expected, $csv->getIds());
+    $this->assertSame($expected, $csv->getIds());
   }
 
   /**
@@ -356,7 +356,7 @@ EOD;
    */
   public function testFields(array $configuration, array $expected): void {
     $csv = new CSV($configuration + ['path' => $this->standardCharsPath], $this->pluginId, $this->pluginDefinition, $this->migration);
-    $this->assertArrayEquals($expected, $csv->fields());
+    $this->assertSame($expected, $csv->fields());
   }
 
   /**