Unit Tests:

* Automatically delete objects that we were created during `wpSetUpBeforeClass` - posts, comments, terms (except 1), and user (except 1)
* The amount of leftover data between tests was breathtaking - use the new function: `_delete_all_data()`
* Commit database transactions for all `TestCase`s, not just those that implement `wpSetUpBeforeClass` and `wpTearDownAfterClass`
* The tests run 10-20 seconds faster now

See #37699.


git-svn-id: https://develop.svn.wordpress.org/trunk@38398 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/functions.php

@@ -48,13 +48,47 @@ function _test_filter_build_unique_id($tag, $function, $priority) {
 	}
 }
 
+function _delete_all_data() {
+	global $wpdb;
+
+	foreach ( array(
+		$wpdb->posts,
+		$wpdb->postmeta,
+		$wpdb->comments,
+		$wpdb->commentmeta,
+		$wpdb->term_relationships,
+		$wpdb->termmeta
+	) as $table ) {
+		$wpdb->query( "DELETE FROM {$table}" );
+	}
+
+	foreach ( array(
+		$wpdb->terms,
+		$wpdb->term_taxonomy
+	) as $table ) {
+		$wpdb->query( "DELETE FROM {$table} WHERE term_id != 1" );
+	}
+
+	$wpdb->query( "UPDATE {$wpdb->term_taxonomy} SET count = 0" );
+
+	$wpdb->query( "DELETE FROM {$wpdb->users} WHERE ID != 1" );
+	$wpdb->query( "DELETE FROM {$wpdb->usermeta} WHERE user_id != 1" );
+}
+
 function _delete_all_posts() {
 	global $wpdb;
 
-	$all_posts = $wpdb->get_col("SELECT ID from {$wpdb->posts}");
-	if ($all_posts) {
-		foreach ($all_posts as $id)
-			wp_delete_post( $id, true );
+	$all_posts = $wpdb->get_results( "SELECT ID, post_type from {$wpdb->posts}", ARRAY_A );
+	if ( ! $all_posts ) {
+		return;
+	}
+
+	foreach ( $all_posts as $data ) {
+		if ( 'attachment' === $data['post_type'] ) {
+			wp_delete_attachment( $data['ID'], true );
+		} else {
+			wp_delete_post( $data['ID'], true );
+		}
 	}
 }