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amp/test/LazyPromiseTest.php

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<?php
namespace Amp\Test;
use Amp\Failure;
use Amp\LazyPromise;
use Amp\Success;
use React\Promise\FulfilledPromise as FulfilledReactPromise;
use React\Promise\RejectedPromise as RejectedReactPromise;
class LazyPromiseTest extends BaseTest
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{
public function testPromisorNotCalledOnConstruct()
{
$invoked = false;
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$lazy = new LazyPromise(function () use (&$invoked) {
$invoked = true;
});
$this->assertFalse($invoked);
}
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public function testPromisorReturningScalar()
{
$invoked = false;
$value = 1;
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$lazy = new LazyPromise(function () use (&$invoked, $value) {
$invoked = true;
return $value;
});
$lazy->onResolve(function ($exception, $value) use (&$result) {
$result = $value;
});
$this->assertTrue($invoked);
$this->assertSame($value, $result);
}
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public function testPromisorReturningSuccessfulPromise()
{
$invoked = false;
$value = 1;
$promise = new Success($value);
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$lazy = new LazyPromise(function () use (&$invoked, $promise) {
$invoked = true;
return $promise;
});
$lazy->onResolve(function ($exception, $value) use (&$result) {
$result = $value;
});
$this->assertTrue($invoked);
$this->assertSame($value, $result);
}
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public function testPromisorReturningFailedPromise()
{
$invoked = false;
$exception = new \Exception;
$promise = new Failure($exception);
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$lazy = new LazyPromise(function () use (&$invoked, $promise) {
$invoked = true;
return $promise;
});
$lazy->onResolve(function ($exception, $value) use (&$reason) {
$reason = $exception;
});
$this->assertTrue($invoked);
$this->assertSame($exception, $reason);
}
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public function testPromisorThrowingException()
{
$invoked = false;
$exception = new \Exception;
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$lazy = new LazyPromise(function () use (&$invoked, $exception) {
$invoked = true;
throw $exception;
});
$lazy->onResolve(function ($exception, $value) use (&$reason) {
$reason = $exception;
});
$this->assertTrue($invoked);
$this->assertSame($exception, $reason);
}
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public function testPromisorReturningSuccessfulReactPromise()
{
$invoked = false;
$value = 1;
$promise = new FulfilledReactPromise($value);
$lazy = new LazyPromise(function () use (&$invoked, $promise) {
$invoked = true;
return $promise;
});
$lazy->onResolve(function ($exception, $value) use (&$result) {
$result = $value;
});
$this->assertTrue($invoked);
$this->assertSame($value, $result);
}
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public function testPromisorReturningFailedReactPromise()
{
$invoked = false;
$exception = new \Exception;
$promise = new RejectedReactPromise($exception);
$lazy = new LazyPromise(function () use (&$invoked, $promise) {
$invoked = true;
return $promise;
});
$lazy->onResolve(function ($exception, $value) use (&$reason) {
$reason = $exception;
});
$this->assertTrue($invoked);
$this->assertSame($exception, $reason);
}
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public function testPromisorReturningGenerator()
{
$invoked = false;
$value = 1;
$lazy = new LazyPromise(function () use (&$invoked, $value) {
$invoked = true;
return $value;
yield; // Unreachable, but makes function a generator.
});
$lazy->onResolve(function ($exception, $value) use (&$result) {
$result = $value;
});
$this->assertTrue($invoked);
$this->assertSame($value, $result);
}
}