Drop support for PHPUnit < 6.4 [1]

Remove the `ExpectExceptionObject` polyfill and all references to it.

README.md

@@ -198,14 +198,6 @@ Features
 
 ### Polyfill traits
 
-#### PHPUnit < 6.4.0: `Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject`
-
-Polyfills the [`TestCase::expectExceptionObject()`] method to test all aspects of an `Exception` by passing an object to the method.
-
-This method was introduced in PHPUnit 6.4.0.
-
-[`TestCase::expectExceptionObject()`]: https://docs.phpunit.de/en/10.5/writing-tests-for-phpunit.html#testing-exceptions
-
 #### PHPUnit < 7.5.0: `Yoast\PHPUnitPolyfills\Polyfills\AssertIsType`
 
 Polyfills the following methods:

phpunitpolyfills-autoload.php

@@ -35,10 +35,6 @@ public static function load( $className ) {
 			}
 
 			switch ( $className ) {
-				case 'Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject':
-					self::loadExpectExceptionObject();
-					return true;
-
 				case 'Yoast\PHPUnitPolyfills\Polyfills\AssertIsType':
 					self::loadAssertIsType();
 					return true;
@@ -115,23 +111,6 @@ public static function load( $className ) {
 			return false;
 		}
 
-		/**
-		 * Load the ExpectExceptionObject polyfill or an empty trait with the same name
-		 * if a PHPUnit version is used which already contains this functionality.
-		 *
-		 * @return void
-		 */
-		public static function loadExpectExceptionObject() {
-			if ( \method_exists( TestCase::class, 'expectExceptionObject' ) === false ) {
-				// PHPUnit < 6.4.0.
-				require_once __DIR__ . '/src/Polyfills/ExpectExceptionObject.php';
-				return;
-			}
-
-			// PHPUnit >= 6.4.0.
-			require_once __DIR__ . '/src/Polyfills/ExpectExceptionObject_Empty.php';
-		}
-
 		/**
 		 * Load the AssertIsType polyfill or an empty trait with the same name
 		 * if a PHPUnit version is used which already contains this functionality.

src/TestCases/TestCasePHPUnitLte7.php

@@ -16,7 +16,6 @@
 use Yoast\PHPUnitPolyfills\Polyfills\AssertStringContains;
 use Yoast\PHPUnitPolyfills\Polyfills\EqualToSpecializations;
 use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionMessageMatches;
-use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject;
 
 /**
  * Basic test case for use with PHPUnit <= 7.
@@ -42,7 +41,6 @@ abstract class TestCase extends PHPUnit_TestCase {
 	use AssertStringContains;
 	use EqualToSpecializations;
 	use ExpectExceptionMessageMatches;
-	use ExpectExceptionObject;
 
 	/**
 	 * This method is called before the first test of this test class is run.

src/TestCases/XTestCase.php

@@ -20,7 +20,6 @@
 use Yoast\PHPUnitPolyfills\Polyfills\AssertStringContains;
 use Yoast\PHPUnitPolyfills\Polyfills\EqualToSpecializations;
 use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionMessageMatches;
-use Yoast\PHPUnitPolyfills\Polyfills\ExpectExceptionObject;
 
 /**
  * Basic test case for use with PHPUnit cross-version.
@@ -48,7 +47,6 @@ abstract class XTestCase extends PHPUnit_TestCase {
 	use AssertStringContains;
 	use EqualToSpecializations;
 	use ExpectExceptionMessageMatches;
-	use ExpectExceptionObject;
 
 	/**
 	 * This method is called before the first test of this test class is run.

tests/TestCases/TestCaseTestTrait.php

@@ -25,20 +25,6 @@ final public static function dataHaveFixtureMethodsBeenTriggered() {
 		];
 	}
 
-	/**
-	 * Test availability of trait polyfilled PHPUnit methods [1].
-	 *
-	 * @return void
-	 *
-	 * @throws Exception For testing purposes.
-	 */
-	final public function testAvailabilityExpectExceptionObjectTrait() {
-		$exception = new Exception( 'message', 101 );
-		$this->expectExceptionObject( $exception );
-
-		throw new Exception( 'message', 101 );
-	}
-
 	/**
 	 * Test availability of trait polyfilled PHPUnit methods [2].
 	 *