diff --git a/tests/phpunit/tests/comment/getPageOfComment.php b/tests/phpunit/tests/comment/getPageOfComment.php
index 7a0bd729b382..102e98aaa9b8 100644
--- a/tests/phpunit/tests/comment/getPageOfComment.php
+++ b/tests/phpunit/tests/comment/getPageOfComment.php
@@ -485,7 +485,7 @@ public function test_page_number_when_unapproved_comments_are_included_for_curre
 
 		remove_filter( 'wp_get_current_commenter', array( $this, 'get_current_commenter' ) );
 
-		$this->assertContains( $new_unapproved, wp_list_pluck( $comments, 'comment_ID' ) );
+		$this->assertContains( (string) $new_unapproved, wp_list_pluck( $comments, 'comment_ID' ) );
 	}
 
 	/**
@@ -534,7 +534,7 @@ public function test_page_number_when_unapproved_comments_are_included_for_curre
 			)
 		);
 
-		$this->assertContains( $new_unapproved, wp_list_pluck( $comments, 'comment_ID' ) );
+		$this->assertContains( (string) $new_unapproved, wp_list_pluck( $comments, 'comment_ID' ) );
 
 		wp_set_current_user( $current_user );
 	}
diff --git a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
index ab5f50e3e363..5e3122ea73c3 100644
--- a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
@@ -891,8 +891,8 @@ public function test_set_value_multiple_custom_schema() {
 		$meta = get_post_meta( self::$post_id, 'test_custom_schema_multi', false );
 		$this->assertNotEmpty( $meta );
 		$this->assertCount( 2, $meta );
-		$this->assertContains( 2, $meta );
-		$this->assertContains( 8, $meta );
+		$this->assertContains( '2', $meta );
+		$this->assertContains( '8', $meta );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
index c9cb763b5838..e3a94552ab04 100644
--- a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
@@ -838,8 +838,8 @@ public function test_set_value_multiple_custom_schema() {
 		$meta = get_term_meta( self::$category_id, 'test_custom_schema_multi', false );
 		$this->assertNotEmpty( $meta );
 		$this->assertCount( 2, $meta );
-		$this->assertContains( 2, $meta );
-		$this->assertContains( 8, $meta );
+		$this->assertContains( '2', $meta );
+		$this->assertContains( '8', $meta );
 	}
 
 	/**