function testSliceMiddle() { $vector = new Vector(0, 1, 2, 3); $slicer = $vector->slice(1, 2); $this->assertInstanceOf('Collections\\Vector', $slicer); $this->assertCount(2, $slicer); $this->assertEquals(1, $slicer[0]); $this->assertEquals(2, $slicer[1]); }