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<?php |
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declare( strict_types = 1 ); |
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use PHPUnit\Framework\TestCase; |
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/** |
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* @covers RewindableGenerator |
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* |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class RewindableGeneratorTest extends TestCase { |
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public function testAdaptsEmptyGenerator() { |
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// Not using simply (yield) as a several static code analysis tools break on it |
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$iterator = new RewindableGenerator( function() { |
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foreach ( [] as $element ) { |
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yield $element; |
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} |
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} ); |
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$this->assertSame( [], iterator_to_array( $iterator ) ); |
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} |
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public function testAdaptsNotEmptyGenerator() { |
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$iterator = new RewindableGenerator( function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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} ); |
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$this->assertSame( |
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[ 'foo', 'bar', 'baz' ], |
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iterator_to_array( $iterator ) |
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); |
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} |
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public function testCanRewind() { |
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$iterator = new RewindableGenerator( function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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} ); |
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$iterator->next(); |
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if ( defined( 'HHVM_VERSION' ) ) { |
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// The fuck HHVM? |
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$iterator->next(); |
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} |
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$this->assertSame( 'bar', $iterator->current(), 'next behaves as expected' ); |
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$iterator->rewind(); |
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$this->assertSame( 'foo', $iterator->current(), 'rewind behaves as expected' ); |
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} |
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public function testIterateTwice() { |
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$iterator = new RewindableGenerator( function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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} ); |
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$this->assertSame( |
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[ 'foo', 'bar', 'baz' ], |
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iterator_to_array( $iterator ) |
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); |
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$this->assertSame( |
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[ 'foo', 'bar', 'baz' ], |
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iterator_to_array( $iterator ) |
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); |
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} |
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public function testGivenNonGeneratorFunction_constructorThrowsException() { |
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$this->expectException( 'InvalidArgumentException' ); |
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new RewindableGenerator( function() {} ); |
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} |
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public function testWhenCallingItTwice_onRewindThrowsException() { |
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$iterator = new RewindableGenerator( function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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} ); |
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$iterator->onRewind( function() {} ); |
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$this->expectException( 'InvalidArgumentException' ); |
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$iterator->onRewind( function() {} ); |
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} |
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public function testWhenOnRewindSetInConstructor_onRewindThrowsException() { |
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$iterator = new RewindableGenerator( |
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function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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}, |
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function() {} |
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); |
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$this->expectException( 'InvalidArgumentException' ); |
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$iterator->onRewind( function() {} ); |
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} |
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public function testWhenCallingRewind_onRewindCallbackGetsCalled() { |
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$events = []; |
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$iterator = new RewindableGenerator( |
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function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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}, |
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function() use ( &$events ) { |
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$events[] = 'callback'; |
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} |
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); |
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$events[] = 'start'; |
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$iterator->rewind(); |
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$events[] = 'done'; |
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$this->assertSame( |
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[ 'start', 'callback', 'done' ], |
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$events |
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); |
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} |
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public function testIteratingMultipleTimes_onRewindCallbackGetsCalled() { |
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$events = []; |
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$iterator = new RewindableGenerator( |
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function() { |
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yield 'foo'; |
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yield 'bar'; |
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yield 'baz'; |
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}, |
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function() use ( &$events ) { |
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$events[] = 'callback'; |
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} |
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); |
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$events[] = 'start'; |
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iterator_to_array( $iterator ); |
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$events[] = 'one done'; |
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iterator_to_array( $iterator ); |
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$events[] = 'two done'; |
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$this->assertSame( |
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[ 'start', 'callback', 'one done', 'callback', 'two done' ], |
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$events |
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); |
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} |
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} |
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JeroenDeDauw /
RewindableGenerator
