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<?php class User { public function __construct( private Base $base, ) { } public function run() { $return = $this->base->f(42); var_dump($return); } } readonly class Base { public function __construct( public int $i, ) { } public function f(int $i): string { echo $i; return 'hoge'; } } class ExpectationException extends \Exception {} readonly class Mock extends Base { public function __construct( private ExpectationStorage $storage = new ExpectationStorage, ) { } public function f(...$args): string { if ($args !== $this->storage->getArgs(__FUNCTION__)) { throw new ExpectationException; } if ($this->storage->hasReturns(__FUNCTION__)) { return $this->storage->getReturns(__FUNCTION__); } } public function expects(): ExpectationBuilder { return new ExpectationBuilder($this->storage); } } class ExpectationBuilder { public function __construct( private ExpectationStorage $storage, ) { } public function __call(string $function_name, $args) { $this->storage->setArgs($function_name, $args); return new FunctionExpectationBuilder($function_name, $this->storage); } } class FunctionExpectationBuilder { public function __construct( private string $function_name, private ExpectationStorage $storage, ) { } public function andReturns($value) { $this->storage->setReturns($this->function_name, $value); return $this; } } class ExpectationStorage { private array $args_expectations = []; private array $returns_expectations = []; public function setArgs(string $function_name, $args) { $this->args_expectations[$function_name] = $args; } public function getArgs(string $function_name) { return $this->args_expectations[$function_name]; } public function setReturns(string $function_name, $value) { $this->returns_expectations[$function_name] = $value; } public function getReturns(string $function_name) { return $this->returns_expectations[$function_name]; } public function hasReturns(string $function_name) { return isset($this->returns_expectations[$function_name]); } } $mock = new Mock(); $mock->expects()->f(42)->andReturns('nya-n'); (new User($mock))->run(); $mock = new Mock(); $mock->expects()->f(128)->andReturns('nya-n'); (new User($mock))->run();