CallableElementTest.php
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CallableElementTest.php
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	<?php

	namespace Keruald\OmniTools\Tests\Reflection;

	use InvalidArgumentException;
	use Keruald\OmniTools\Reflection\CallableElement;

	use PHPUnit\Framework\TestCase;

	class CallableElementTest extends TestCase {

	private CallableElement $closure;

	protected function setUp () : void {
	$fn = fn(int $a, int $b) : int => $a + $b;
	$this->closure = new CallableElement($fn);
	}

	public function testCountArguments () : void {
	$this->assertEquals(2, $this->closure->countArguments());
	}

	public function testCountArgumentsWhenThereIsNone () : void {
	$fn = fn() => null;
	$closure = new CallableElement($fn);

	$this->assertEquals(0, $closure->countArguments());
	}

	public function testHasReturnType () : void {
	$this->assertTrue($this->closure->hasReturnType("int"));
	$this->assertFalse($this->closure->hasReturnType("quux"));
	}

	public function testHasReturnTypeWhenThereIsNone () : void {
	// Closure without any explicit return type
	$fn = fn(int $a, int $b) => $a + $b;
	$closure = new CallableElement($fn);

	$this->assertFalse($closure->hasReturnType("int"));
	}

	public function testGetReturnType () : void {
	$this->assertEquals("int", $this->closure->getReturnType());
	}

	public function testGetReturnTypeWhenThereIsNone () : void {
	// Closure without any explicit return type
	$fn = fn(int $a, int $b) => $a + $b;
	$closure = new CallableElement($fn);

	$this->expectException(InvalidArgumentException::class);
	$closure->getReturnType();
	}

	}