php bin/magento module:enable Test_ProductType

php bin/magento

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
 <module name="Test_ProductType" setup_version="2.0.5">
 <sequence>
    <module name="Test_ProductType"/></sequence>
 </module>
</config>

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Scandesigns_ProductType" setup_version="2.0.5"/>
</config>