graze / data-structure

        $this->assertEquals(3, count($coll));

    }

    public function testFilter()

    {

        $coll = new ImmutableCollection(['foo', 'bar', 'baz']);

        $result = $coll->filter(function ($item) {

            return 'foo' !== $item;

        });

        $this->assertEquals(['foo', 'bar', 'baz'], $coll->getAll());

        $this->assertEquals(['bar', 'baz'], $result->getAll());

        $this->assertNotSame($coll, $result);

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testGetIterator()

    {

        $this->assertEquals('foobarbaz', $result);

    }

    public function testSort()

    {

        $coll = new ImmutableCollection([2, 3, 1]);

        $result = $coll->sort(s\comparison_fn(function ($item) {

            return $item;

        }));

        $this->assertEquals([2, 3, 1], $coll->getAll());

        $this->assertEquals([1, 2, 3], $result->getAll());

        $this->assertNotSame($coll, $result);

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testSortOnAsc()

    {

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testSortOnAsc()

    {

        $coll = new ImmutableCollection([2, 3, 1]);

        $result = $coll->sortOn(function ($item) {

            return $item;

        });

        $this->assertEquals([2, 3, 1], $coll->getAll());

        $this->assertEquals([1, 2, 3], $result->getAll());

        $this->assertNotSame($coll, $result);

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testSortOnDesc()

    {

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testSortOnDesc()

    {

        $coll = new ImmutableCollection([2, 3, 1]);

        $result = $coll->sortOn(function ($item) {

            return $item;

        }, s\DESC);

        $this->assertEquals([2, 3, 1], $coll->getAll());

        $this->assertEquals([3, 2, 1], $result->getAll());

        $this->assertNotSame($coll, $result);

        $this->assertInstanceOf('Graze\DataStructure\Collection\ImmutableCollection', $result);

    }

    public function testSerialize()

    {