hiqdev / php-billing

        $this->engine = new FormulaEngine();

    }

    public function testSimpleDiscount()

    {

        $date = '2018-08-01';

        $rate = '2';

        $reason = 'test reason';

        $formula = $this->engine->build("discount.fixed('$rate%').since('$date').reason('$reason')");

        $this->assertInstanceOf(FixedDiscount::class, $formula);

        $this->assertSame($rate, $formula->getValue()->getValue());

        $this->assertTrue($formula->isRelative());

        $this->assertInstanceOf(Since::class, $formula->getSince());

        $this->assertEquals(new DateTimeImmutable($date), $formula->getSince()->getValue());

        $this->assertInstanceOf(Reason::class, $formula->getReason());

        $this->assertSame($reason, $formula->getReason()->getValue());

        $this->assertNull($formula->getTill());

    }

    public function testSimpleLeasing()

    {

        $this->assertNull($formula->getTill());

    }

    public function testSimpleLeasing()

    {

        $date = '2018-08-01';

        $num = 2;

        $reason = 'test reason';

        $formula = $this->engine->build("leasing.since('$date').lasts('$num months').reason('$reason')");

        $this->assertInstanceOf(Leasing::class, $formula);

        $this->assertInstanceOf(MonthPeriod::class, $formula->getTerm());

        $this->assertSame($num, $formula->getTerm()->getValue());

        $this->assertInstanceOf(Since::class, $formula->getSince());

        $this->assertEquals(new DateTimeImmutable($date), $formula->getSince()->getValue());

        $this->assertInstanceOf(Reason::class, $formula->getReason());

        $this->assertSame($reason, $formula->getReason()->getValue());

        $this->assertNull($formula->getTill());

    }

    public function normalizeDataProvider()

    {