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                <?php
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                namespace Radowoj\Searcher\SearchResult;
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                use PHPUnit\Framework\TestCase;
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                use Radowoj\Searcher\SearchResult\Collection;
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                use Radowoj\Searcher\SearchResult\Item;
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                use Radowoj\Searcher\SearchResult\IItem;
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                use Traversable;
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                use Countable;
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                class CollectionTest extends TestCase
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                {
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                    protected $collection;
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                    public function setUp()
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                    {
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                        $this->collection = new Collection([
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                            0 => new Item([]),
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                            1 => new Item([]),
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                        ], 42);
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                    }
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                    public function testInstantiation()
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                    {
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                        $collection = new Collection();
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                    }
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                    public function testOffsetExists()
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                    {
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                        $this->assertTrue($this->collection->offsetExists(0));
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                        $this->assertTrue($this->collection->offsetExists(1));
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                        $this->assertFalse($this->collection->offsetExists(2));
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                    }
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                    /**
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                     * @expectedException OutOfRangeException
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                     * @expectedExceptionMessage Invalid collection index: 2
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                     */
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                    public function testOffsetGet()
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                    {
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                        $this->assertInstanceOf(IItem::class, $this->collection->offsetGet(0));
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                        $this->assertInstanceOf(IItem::class, $this->collection->offsetGet(1));
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                        $this->assertInstanceOf(IItem::class, $this->collection->offsetGet(2));
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                    }
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                    /**
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                     * @expectedException Exception
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                     * @expectedExceptionMessage Search result collection is immutable.
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                     */
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                    public function testOffsetSetImmutability()
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                    {
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                        $this->collection->offsetSet(1, 'asas');
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                    }
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                    /**
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                     * @expectedException Exception
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                     * @expectedExceptionMessage Search result collection is immutable.
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                     */
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                    public function testOffsetUnsetImmutability()
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                    {
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                        $this->collection->offsetUnset(1);
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                    }
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                    public function testIterator()
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                    {
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                        $this->assertInstanceOf(Traversable::class, $this->collection);
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                        $this->assertInstanceOf(Traversable::class, $this->collection->getIterator());
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                    }
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                    public function testCountable()
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                    {
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                        $this->assertInstanceOf(Countable::class, $this->collection);
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                        $this->assertSame(2, $this->collection->count());
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                    }
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                    public function testTotalCount()
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                    {
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                        $this->assertSame(42, $this->collection->totalCount());
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                    }
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                }
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.