diff --git a/tests/phpunit/tests/term/wpInsertTerm.php b/tests/phpunit/tests/term/wpInsertTerm.php
index 0bf95b9a10279..916984822af42 100644
--- a/tests/phpunit/tests/term/wpInsertTerm.php
+++ b/tests/phpunit/tests/term/wpInsertTerm.php
@@ -907,6 +907,77 @@ public function test_wp_insert_term_with_empty_name_after_db_sanitization() {
 		$this->assertSame( 'invalid_term_name', $term->get_error_code() );
 	}
 
+	/**
+	 * @ticket 31270
+	 */
+	public function test_wp_insert_term_root_level_term_with_same_name_as_child_should_get_clean_slug() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+		$t1 = self::factory()->term->create(
+			array(
+				'name'     => 'Foo',
+				'taxonomy' => 'wptests_tax',
+			)
+		);
+
+		self::factory()->term->create(
+			array(
+				'name'     => 'Bar',
+				'slug'     => 'foo-bar',
+				'parent'   => $t1,
+				'taxonomy' => 'wptests_tax',
+			)
+		);
+
+		$t3 = wp_insert_term( 'Bar', 'wptests_tax' );
+
+		$this->assertNotWPError( $t3 );
+		$t3_term = get_term( $t3['term_id'], 'wptests_tax' );
+		$this->assertSame( 'bar', $t3_term->slug );
+	}
+
+	/**
+	 * @ticket 31270
+	 */
+	public function test_wp_insert_term_child_term_with_same_name_as_another_child_under_different_parent_should_get_clean_slug() {
+		register_taxonomy( 'wptests_tax', 'post', array( 'hierarchical' => true ) );
+
+		$t1 = self::factory()->term->create(
+			array(
+				'name'     => 'Parent One',
+				'taxonomy' => 'wptests_tax',
+			)
+		);
+
+		$t2 = self::factory()->term->create(
+			array(
+				'name'     => 'Parent Two',
+				'taxonomy' => 'wptests_tax',
+			)
+		);
+
+		self::factory()->term->create(
+			array(
+				'name'     => 'Child',
+				'slug'     => 'parent-one-child',
+				'parent'   => $t1,
+				'taxonomy' => 'wptests_tax',
+			)
+		);
+
+		$t4 = wp_insert_term(
+			'Child',
+			'wptests_tax',
+			array(
+				'parent' => $t2,
+			)
+		);
+
+		$this->assertNotWPError( $t4 );
+		$t4_term = get_term( $t4['term_id'], 'wptests_tax' );
+		$this->assertSame( 'child', $t4_term->slug );
+	}
+
 	/** Helpers */
 
 	public function deleted_term_cb( $term, $tt_id, $taxonomy, $deleted_term, $object_ids ) {