Add test helper for warnings

Author: GromNaN

tests/Model/CodecCursorFunctionalTest.php

@@ -13,6 +13,7 @@
 
 use const E_DEPRECATED;
 use const E_USER_DEPRECATED;
+use const E_USER_WARNING;
 
 class CodecCursorFunctionalTest extends FunctionalTestCase
 {
@@ -30,10 +31,7 @@ public function testSetTypeMap(): void
 
         $codecCursor = CodecCursor::fromCursor($cursor, $this->createMock(DocumentCodec::class));
 
-        $this->expectWarning();
-        $this->expectExceptionMessage('Discarding type map for MongoDB\Model\CodecCursor::setTypeMap');
-
-        $codecCursor->setTypeMap(['root' => 'array']);
+        $this->assertError(E_USER_WARNING, fn () => $codecCursor->setTypeMap(['root' => 'array']));
     }
 
     public function testGetIdReturnTypeWithoutArgument(): void

tests/TestCase.php

@@ -159,12 +159,17 @@ final public static function provideInvalidStringValues(): array
     }
 
     protected function assertDeprecated(callable $execution): void
+    {
+        $this->assertError(E_USER_DEPRECATED, $execution);
+    }
+
+    protected function assertError(int $levels, callable $execution): void
     {
         $errors = [];
 
         set_error_handler(function ($errno, $errstr) use (&$errors): void {
             $errors[] = $errstr;
-        }, E_USER_DEPRECATED);
+        }, $levels);
 
         try {
             call_user_func($execution);