Ruleset test: Fix bug where it doesn't catch proper number of errors/warnings on a line basis due to order of operations of incrementating after assignment.

Author: rebeccahum

tests/RulesetTest.php

@@ -188,7 +188,7 @@ private function violation_type_is_error( $violation ) {
 	 * @param int $line Line number.
 	 */
 	private function add_error_for_line( $line ) {
-		$this->errors[ $line ] = isset( $this->errors[ $line ] ) ? $this->errors[ $line ]++ : 1;
+		$this->errors[ $line ] = isset( $this->errors[ $line ] ) ? ++$this->errors[ $line ] : 1;
 	}
 
 	/**
@@ -197,7 +197,7 @@ private function add_error_for_line( $line ) {
 	 * @param int $line Line number.
 	 */
 	private function add_warning_for_line( $line ) {
-		$this->warnings[ $line ] = isset( $this->warnings[ $line ] ) ? $this->warnings[ $line ]++ : 1;
+		$this->warnings[ $line ] = isset( $this->warnings[ $line ] ) ? ++$this->warnings[ $line ] : 1;
 	}
 
 	/**