MathPHP\SetTheory\SetOperationsTest::testAddMultiWithArrayOfArraysMultipleArraysAndDuplicates PHP Method

    public function testAddMultiWithArrayOfArraysMultipleArraysAndDuplicates()
    {
        $set = new Set([1, 2, 3]);
        $array = [4, 5, [1, 2, 3], [1, 2, 3], [5, 5, 5]];
        $set->addMulti($array);
        // Only 7, because [1, 2, 3] was in there twice.
        $this->assertEquals(7, count($set));
        $this->assertEquals(7, count($set->asArray()));
        $arrays = 0;
        foreach ($set as $key => $value) {
            if (is_array($value)) {
                $arrays++;
                $this->assertEquals(3, count($value));
            }
        }
        // There should have been 2 arrays.
        $this->assertEquals(2, $arrays);
    }