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<?php |
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declare( strict_types = 1 ); |
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namespace FileFetcher\Tests\Unit; |
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use FileFetcher\FileFetchingException; |
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use FileFetcher\InMemoryFileFetcher; |
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use FileFetcher\PsrCacheFileFetcher; |
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use FileFetcher\ThrowingFileFetcher; |
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use PHPUnit\Framework\TestCase; |
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use Psr\SimpleCache\CacheException; |
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use Psr\SimpleCache\CacheInterface; |
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/** |
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* @covers \FileFetcher\PsrCacheFileFetcher |
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* |
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* @licence BSD-3-Clause |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class PsrCacheFileFetcherTest extends TestCase { |
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private const FILE_URL = 'foo://bar'; |
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private const FILE_CONTENT = 'NyanData across the sky!'; |
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public function testWhenFileIsNotCached_itGetsRetrieved() { |
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$cachingFetcher = new PsrCacheFileFetcher( |
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new InMemoryFileFetcher( [ |
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self::FILE_URL => self::FILE_CONTENT |
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] ), |
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$this->newNullCache() |
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); |
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$this->assertSame( |
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self::FILE_CONTENT, |
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$cachingFetcher->fetchFile( self::FILE_URL ) |
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); |
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} |
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private function newNullCache(): CacheInterface { |
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$cache = $this->createMock( CacheInterface::class ); |
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$cache->expects( $this->any() ) |
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->method( 'get' ) |
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->with( self::FILE_URL ) |
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->will( $this->returnValue( null ) ); |
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return $cache; |
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} |
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public function testWhenFileIsCached_cachedContentsGetsReturned() { |
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$cachingFetcher = new PsrCacheFileFetcher( |
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new ThrowingFileFetcher(), |
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$this->newCacheWithFile() |
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); |
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$this->assertSame( |
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self::FILE_CONTENT, |
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$cachingFetcher->fetchFile( self::FILE_URL ) |
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); |
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} |
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private function newCacheWithFile(): CacheInterface { |
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$cache = $this->createMock( CacheInterface::class ); |
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$cache->expects( $this->once() ) |
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->method( 'get' ) |
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->with( self::FILE_URL ) |
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->will( $this->returnValue( self::FILE_CONTENT ) ); |
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return $cache; |
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} |
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public function testWhenFileIsNotCached_fileContentsGetsCached() { |
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$cache = $this->newNullCache(); |
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$cache->expects( $this->once() ) |
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->method( 'set' ) |
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->with( |
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$this->equalTo( self::FILE_URL ), |
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$this->equalTo( self::FILE_CONTENT ) |
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); |
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$cachingFetcher = new PsrCacheFileFetcher( |
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new InMemoryFileFetcher( [ |
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self::FILE_URL => self::FILE_CONTENT |
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] ), |
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$cache |
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); |
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$cachingFetcher->fetchFile( self::FILE_URL ); |
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} |
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public function testWhenFetcherThrowsException_itIsNotCaught() { |
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$fetcher = new PsrCacheFileFetcher( new ThrowingFileFetcher(), $this->newNullCache() ); |
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$this->expectException( FileFetchingException::class ); |
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$fetcher->fetchFile( self::FILE_URL ); |
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} |
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public function testWhenCacheReadThrowsException_fileContentIsFetched() { |
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$cachingFetcher = new PsrCacheFileFetcher( |
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new InMemoryFileFetcher( [ |
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self::FILE_URL => self::FILE_CONTENT |
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] ), |
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$this->newCacheThatThrowsOnGet() |
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); |
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$this->assertSame( |
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self::FILE_CONTENT, |
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$cachingFetcher->fetchFile( self::FILE_URL ) |
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); |
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} |
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private function newCacheThatThrowsOnGet(): CacheInterface { |
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$cache = $this->createMock( CacheInterface::class ); |
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$cache->expects( $this->any() ) |
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->method( 'get' ) |
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->willThrowException( $this->newCacheException() ); |
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return $cache; |
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} |
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private function newCacheException(): \Exception { |
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return new class() extends \Exception implements CacheException { |
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}; |
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} |
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public function testWhenCacheWriteThrowsException_fileContentIsReturned() { |
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$cachingFetcher = new PsrCacheFileFetcher( |
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new InMemoryFileFetcher( [ |
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self::FILE_URL => self::FILE_CONTENT |
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] ), |
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$this->newCacheThatThrowsOnSet() |
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); |
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$this->assertSame( |
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self::FILE_CONTENT, |
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$cachingFetcher->fetchFile( self::FILE_URL ) |
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); |
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} |
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private function newCacheThatThrowsOnSet(): CacheInterface { |
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$cache = $this->createMock( CacheInterface::class ); |
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$cache->expects( $this->any() ) |
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->method( 'set' ) |
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->willThrowException( $this->newCacheException() ); |
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return $cache; |
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} |
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} |
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JeroenDeDauw /
FileFetcher
