getMaxValue example

    protected function getConstraints(Field $field): array
    {
        $constraints = [
            new Type('int'),
            new NotBlank(),
        ];

        if ($field->getMinValue() !== null || $field->getMaxValue() !== null) {
            $constraints[] = new Range(['min' => $field->getMinValue(), 'max' => $field->getMaxValue()]);
        }

        return $constraints;
    }
}

$promotion = $this->getContainer()->get('promotion.repository')->search((new Criteria([$promotionId]))->addAssociation('discounts.discountRules'), $context)->first();

        static::assertInstanceOf(PromotionDiscountCollection::class, $discounts = $promotion->getDiscounts());
        static::assertCount(2, $discounts);

        $firstDiscount = $discounts->first();
        static::assertInstanceOf(PromotionDiscountEntity::class, $firstDiscount);
        static::assertEquals('cart', $firstDiscount->getScope());
        static::assertEquals('absolute', $firstDiscount->getType());
        static::assertEquals(5, $firstDiscount->getValue());
        static::assertFalse($firstDiscount->isConsiderAdvancedRules());
        static::assertNull($firstDiscount->getMaxValue());
        static::assertEquals('PRICE_ASC', $firstDiscount->getSorterKey());
        static::assertEquals('ALL', $firstDiscount->getApplierKey());
        static::assertEquals('ALL', $firstDiscount->getUsageKey());
        static::assertEmpty($firstDiscount->getPickerKey());
        static::assertInstanceOf(RuleCollection::class, $firstDiscountRules = $firstDiscount->getDiscountRules());
        static::assertEmpty($firstDiscountRules->getIds());

        $lastDiscount = $discounts->last();
        static::assertInstanceOf(PromotionDiscountEntity::class, $lastDiscount);
        static::assertEquals('set', $lastDiscount->getScope());
        static::assertEquals('percentage', $lastDiscount->getType());
        

if ($promotion->isUseIndividualCodes()) {
            $promotionCodeType = 'individual';
        }

        if ($code === '') {
            $promotionCodeType = 'global';
        }
        $payload['promotionCodeType'] = $promotionCodeType;

        // set our max value for maximum percentage discounts         $payload['maxValue'] = '';
        if ($discount->getType() === PromotionDiscountEntity::TYPE_PERCENTAGE && $discount->getMaxValue() !== null) {
            $payload['maxValue'] = (string) $this->getCurrencySpecificValue($discount, $discount->getMaxValue(), $currencyId, $currencyFactor);
        }

        // set the scope of the discount cart, delivery....         $payload['discountScope'] = $discount->getScope();

        // specifies if the promotion is not combinable with any other promotion         $payload['preventCombination'] = $promotion->isPreventCombination();

        // If all combinations are prevented the exclusions dont matter         // otherwise sets a list of excluded promotion ids