As of PHPUnit 9, the global function wrappers are always available

Author: sebastianbergmann

src/assertions.rst

@@ -20,11 +20,7 @@ The assertion methods are declared static and can be invoked
 from any context using ``PHPUnit\Framework\Assert::assertTrue()``,
 for instance, or using ``$this->assertTrue()`` or ``self::assertTrue()``,
 for instance, in a class that extends ``PHPUnit\Framework\TestCase``.
-
-In fact, you can even use global function wrappers such as ``assertTrue()`` in
-any context (including classes that extend ``PHPUnit\Framework\TestCase``)
-when you (manually) include the :file:`src/Framework/Assert/Functions.php`
-sourcecode file that comes with PHPUnit.
+You can even use global function wrappers such as ``assertTrue()``.
 
 A common question, especially from developers new to PHPUnit, is whether
 using ``$this->assertTrue()`` or ``self::assertTrue()``,