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amp/test/Pipeline/MergeTest.php
2020-09-24 12:53:31 -05:00

102 lines
2.9 KiB
PHP

<?php
namespace Amp\Test\Pipeline;
use Amp\AsyncGenerator;
use Amp\Delayed;
use Amp\PHPUnit\AsyncTestCase;
use Amp\PHPUnit\TestException;
use Amp\Pipeline;
class MergeTest extends AsyncTestCase
{
public function getArrays(): array
{
return [
[[\range(1, 3), \range(4, 6)], [1, 4, 2, 5, 3, 6]],
[[\range(1, 5), \range(6, 8)], [1, 6, 2, 7, 3, 8, 4, 5]],
[[\range(1, 4), \range(5, 10)], [1, 5, 2, 6, 3, 7, 4, 8, 9, 10]],
];
}
/**
* @dataProvider getArrays
*
* @param array $pipelines
* @param array $expected
*/
public function testMerge(array $pipelines, array $expected)
{
$pipelines = \array_map(static function (array $iterator): Pipeline {
return Pipeline\fromIterable($iterator);
}, $pipelines);
$pipeline = Pipeline\merge($pipelines);
while (null !== $value = yield $pipeline->continue()) {
$this->assertSame(\array_shift($expected), $value);
}
}
/**
* @depends testMerge
*/
public function testMergeWithDelayedYields()
{
$pipelines = [];
$values1 = [new Delayed(10, 1), new Delayed(50, 2), new Delayed(70, 3)];
$values2 = [new Delayed(20, 4), new Delayed(40, 5), new Delayed(60, 6)];
$expected = [1, 4, 5, 2, 6, 3];
$pipelines[] = new AsyncGenerator(function (callable $yield) use ($values1) {
foreach ($values1 as $value) {
yield $yield(yield $value);
}
});
$pipelines[] = new AsyncGenerator(function (callable $yield) use ($values2) {
foreach ($values2 as $value) {
yield $yield(yield $value);
}
});
$pipeline = Pipeline\merge($pipelines);
while (null !== $value = yield $pipeline->continue()) {
$this->assertSame(\array_shift($expected), $value);
}
}
/**
* @depends testMerge
*/
public function testMergeWithFailedPipeline()
{
$exception = new TestException;
$generator = new AsyncGenerator(static function (callable $yield) use ($exception) {
yield $yield(1); // Emit once before failing.
throw $exception;
});
$pipeline = Pipeline\merge([$generator, Pipeline\fromIterable(\range(1, 5))]);
try {
/** @noinspection PhpStatementHasEmptyBodyInspection */
while (yield $pipeline->continue()) {
;
}
$this->fail("The exception used to fail the pipeline should be thrown from continue()");
} catch (TestException $reason) {
$this->assertSame($exception, $reason);
}
}
public function testNonPipeline()
{
$this->expectException(\TypeError::class);
/** @noinspection PhpParamsInspection */
Pipeline\merge([1]);
}
}