Stock/Model/Availability.php
public function getMessagesForQuantity(float $quantity)
    {
        $messages = [];

        if ($quantity < $this->minimumQuantity) {
            $messages[] = $this->minimumMessage;
        } elseif (0 < $this->maximumQuantity && $quantity > $this->maximumQuantity) {
            $messages[] = $this->maximumMessage;
        } else {
            if (null !== $this->availableMessage) {
                $messages[] = $this->availableMessage;
            }

            if ($quantity > $this->availableQuantity) {
                if (null !== $this->resupplyMessage) {
                    $messages[] = $this->resupplyMessage;
                    if ($quantity > $this->availableQuantity + $this->resupplyQuantity) {
                        $messages[] = $this->overflowMessage;
                    }
                } else {
                    $messages[] = $this->overflowMessage;
                }
            }
        }

        if (empty($messages)) {
            $messages[] = $this->overflowMessage;
        }

        return $messages;
    }
public function getMessagesForQuantity(float $quantity)
    {
        $messages = [];

        if ($quantity < $this->minimumQuantity) {
            $messages[] = $this->minimumMessage;
        } elseif (0 < $this->maximumQuantity && $quantity > $this->maximumQuantity) {
            $messages[] = $this->maximumMessage;
        } else {
            if (null !== $this->availableMessage) {
                $messages[] = $this->availableMessage;
            }

            if ($quantity > $this->availableQuantity) {
                if (null !== $this->resupplyMessage) {
                    $messages[] = $this->resupplyMessage;
                    if ($quantity > $this->availableQuantity + $this->resupplyQuantity) {
                        $messages[] = $this->overflowMessage;
                    }
                } else {
                    $messages[] = $this->overflowMessage;
                }
            }
        }

        if (empty($messages)) {
            $messages[] = $this->overflowMessage;
        }

        return $messages;
    }
Returns the messages for the given quantity.

@param float $quantity

@return array