unique_input_attribute.php

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<?php
$entityType = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
    \Magento\Eav\Model\Entity\Type::class
);
$entityType->loadByCode('catalog_product');
$defaultSetId = $entityType->getDefaultAttributeSetId();
$defaultSet = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
    \Magento\Eav\Model\Entity\Attribute\Set::class
);
$defaultSet->load($defaultSetId);
$defaultGroupId = $defaultSet->getDefaultGroupId();

$attribute = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
    \Magento\Catalog\Model\ResourceModel\Eav\Attribute::class
);
$attribute->setAttributeCode(
    'unique_input_attribute'
)->setEntityTypeId(
    $entityType->getEntityTypeId()
)->setAttributeGroupId(
    $defaultGroupId
)->setAttributeSetId(
    $defaultSetId
)->setFrontendInput(
    'text'
)->setFrontendLabel(
    'Unique Input Attribute'
)->setBackendType(
    'varchar'
)->setIsUserDefined(
    1
)->setIsUnique(
    1
)->save();