Build/Test Tools: Handle removal of TestCase::getAnnotations().

The PHPUnit native `TestCase::getAnnotations()` method is used to check for WP flavored deprecation notices, however, this method was not covered by the backward compatibility promise for PHPUnit (and was annotated as excluded).

The method has been removed as part of an internal refactor in commit [sebastianbergmann/phpunit@6858204 sebastianbergmann/phpunit@6858204], which is included in PHPUnit 9.5.0.

For now, a workaround is put in place, but it is recommended that the WP `expectDeprecated()` method should be reevaluated in a future iteration.

Follow-up to [51559-51571].

Props jrf.
See #46149.

git-svn-id: https://develop.svn.wordpress.org/trunk@51572 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/includes/abstract-testcase.php

@@ -472,7 +472,17 @@ public function wp_die_handler( $message ) {
 	 * Sets up the expectations for testing a deprecated call.
 	 */
 	public function expectDeprecated() {
-		$annotations = $this->getAnnotations();
+		if ( method_exists( $this, 'getAnnotations' ) ) {
+			// PHPUnit < 9.5.0.
+			$annotations = $this->getAnnotations();
+		} else {
+			// PHPUnit >= 9.5.0.
+			$annotations = \PHPUnit\Util\Test::parseTestMethodAnnotations(
+				static::class,
+				$this->getName( false )
+			);
+		}
+
 		foreach ( array( 'class', 'method' ) as $depth ) {
 			if ( ! empty( $annotations[ $depth ]['expectedDeprecated'] ) ) {
 				$this->expected_deprecated = array_merge( $this->expected_deprecated, $annotations[ $depth ]['expectedDeprecated'] );