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amp/test/Iterator/ConcatTest.php

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<?php
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namespace Amp\Test\Iterator;
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use Amp\Iterator;
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use Amp\PHPUnit\AsyncTestCase;
use Amp\PHPUnit\TestException;
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use Amp\Producer;
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class ConcatTest extends AsyncTestCase
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{
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public function getArrays(): array
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{
return [
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[[\range(1, 3), \range(4, 6)], \range(1, 6)],
[[\range(1, 5), \range(6, 8)], \range(1, 8)],
[[\range(1, 4), \range(5, 10)], \range(1, 10)],
];
}
/**
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* @dataProvider getArrays
*
* @param array $iterators
* @param array $expected
*/
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public function testConcat(array $iterators, array $expected): \Generator
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{
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$iterators = \array_map(function (array $iterator): Iterator {
return Iterator\fromIterable($iterator);
}, $iterators);
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$iterator = Iterator\concat($iterators);
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while (yield $iterator->advance()) {
$this->assertSame(\array_shift($expected), $iterator->getCurrent());
}
}
/**
* @depends testConcat
*/
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public function testConcatWithFailedIterator(): \Generator
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{
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$exception = new TestException;
$expected = \range(1, 6);
$producer = new Producer(function (callable $emit) use ($exception) {
yield $emit(6); // Emit once before failing.
throw $exception;
});
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$iterator = Iterator\concat([Iterator\fromIterable(\range(1, 5)), $producer, Iterator\fromIterable(\range(7, 10))]);
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try {
while (yield $iterator->advance()) {
$this->assertSame(\array_shift($expected), $iterator->getCurrent());
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}
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$this->fail("The exception used to fail the iterator should be thrown from advance()");
} catch (TestException $reason) {
$this->assertSame($exception, $reason);
}
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$this->assertEmpty($expected);
}
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public function testNonIterator(): void
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{
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$this->expectException(\TypeError::class);
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Iterator\concat([1]);
}
}