diff --git a/tests/phpunit/includes/testcase.php b/tests/phpunit/includes/testcase.php
index 933e66f76a..782482f196 100644
--- a/tests/phpunit/includes/testcase.php
+++ b/tests/phpunit/includes/testcase.php
@@ -47,6 +47,7 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		if ( defined( 'WP_RUN_CORE_TESTS' ) && WP_RUN_CORE_TESTS ) {
 			$this->reset_post_types();
 			$this->reset_taxonomies();
+			$this->reset_post_statuses();
 		}
 
 		$this->start_transaction();
@@ -107,6 +108,15 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 		create_initial_taxonomies();
 	}
 
+	/**
+	 * Unregister non-built-in post statuses.
+	 */
+	protected function reset_post_statuses() {
+		foreach ( get_post_stati( array( '_builtin' => false ) ) as $post_status ) {
+			_unregister_post_status( $post_status );
+		}
+	}
+
 	/**
 	 * Saves the action and filter-related globals so they can be restored later.
 	 *
diff --git a/tests/phpunit/includes/utils.php b/tests/phpunit/includes/utils.php
index 3d91f0663d..d6ea45c5c5 100644
--- a/tests/phpunit/includes/utils.php
+++ b/tests/phpunit/includes/utils.php
@@ -331,6 +331,17 @@ function _unregister_taxonomy( $taxonomy_name ) {
 	unset( $GLOBALS['wp_taxonomies'][$taxonomy_name] );
 }
 
+/**
+ * Unregister a post status.
+ *
+ * @since 4.2.0
+ *
+ * @param string $status
+ */
+function _unregister_post_status( $status ) {
+	unset( $GLOBALS['wp_post_statuses'][ $status ] );
+}
+
 function _cleanup_query_vars() {
 	// clean out globals to stop them polluting wp and wp_query
 	foreach ( $GLOBALS['wp']->public_query_vars as $v )
diff --git a/tests/phpunit/tests/includes/helpers.php b/tests/phpunit/tests/includes/helpers.php
index c589022e8c..2bcd309dbc 100755
--- a/tests/phpunit/tests/includes/helpers.php
+++ b/tests/phpunit/tests/includes/helpers.php
@@ -159,4 +159,13 @@ class Tests_TestHelpers extends WP_UnitTestCase {
 			$this->assertEqualSetsWithIndex( $expected, $actual );
 		}
 	}
+
+	public function test__unregister_post_status() {
+		register_post_status( 'foo' );
+		_unregister_post_status( 'foo' );
+
+		$stati = get_post_stati();
+
+		$this->assertFalse( isset( $stati['foo'] ) );
+	}
 }