diff --git a/modules/order/src/Entity/LineItem.php b/modules/order/src/Entity/LineItem.php
index 677e098d79..8c8b92636f 100644
--- a/modules/order/src/Entity/LineItem.php
+++ b/modules/order/src/Entity/LineItem.php
@@ -102,7 +102,7 @@ public function setTitle($title) {
    * {@inheritdoc}
    */
   public function getQuantity() {
-    return $this->get('quantity')->value;
+    return (string) $this->get('quantity')->value;
   }
 
   /**
diff --git a/modules/promotion/commerce_promotion.services.yml b/modules/promotion/commerce_promotion.services.yml
index 7a2d64055a..99cae2760a 100644
--- a/modules/promotion/commerce_promotion.services.yml
+++ b/modules/promotion/commerce_promotion.services.yml
@@ -2,3 +2,6 @@ services:
   plugin.manager.commerce_promotion_offer:
     class: Drupal\commerce_promotion\PromotionOfferManager
     arguments: ['@container.namespaces', '@cache.discovery', '@module_handler', '@entity_type.manager']
+  plugin.manager.commerce_promotion_condition:
+    class: Drupal\commerce_promotion\PromotionConditionManager
+    arguments: ['@container.namespaces', '@cache.discovery', '@module_handler', '@entity_type.manager']
diff --git a/modules/promotion/src/Annotation/CommercePromotionCondition.php b/modules/promotion/src/Annotation/CommercePromotionCondition.php
new file mode 100644
index 0000000000..ec00de283a
--- /dev/null
+++ b/modules/promotion/src/Annotation/CommercePromotionCondition.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Drupal\commerce_promotion\Annotation;
+
+use Drupal\Core\Condition\Annotation\Condition;
+
+/**
+ * Defines the promotion condition plugin annotation object.
+ *
+ * Plugin namespace: Plugin\Commerce\PromotionCondition.
+ *
+ * @Annotation
+ */
+class CommercePromotionCondition extends Condition {
+
+  /**
+   * The target entity type this action applies to.
+   *
+   * For example, this should be 'commerce_order' or 'commerce_line_item'.
+   *
+   * @var string
+   */
+  public $target_entity_type;
+
+}
diff --git a/modules/promotion/src/Entity/Promotion.php b/modules/promotion/src/Entity/Promotion.php
index 57224bfcfc..2142c2b73a 100644
--- a/modules/promotion/src/Entity/Promotion.php
+++ b/modules/promotion/src/Entity/Promotion.php
@@ -236,6 +236,28 @@ public function setEnabled($enabled) {
     return $this;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(EntityInterface $entity) {
+    $entity_type_id = $entity->getEntityTypeId();
+    // @todo should whatever invokes this method be providing the context?
+    $context = new Context(new ContextDefinition('entity:' . $entity_type_id), $entity);
+
+    // Execute each plugin, this is an AND operation.
+    // @todo support OR operations.
+    /** @var \Drupal\commerce\Plugin\Field\FieldType\PluginItem $item */
+    foreach ($this->get('conditions') as $item) {
+      /** @var \Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition\PromotionConditionInterface $condition */
+      $condition = $item->getTargetInstance([$entity_type_id => $context]);
+      if (!$condition->evaluate()) {
+        return FALSE;
+      }
+    }
+
+    return TRUE;
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -243,6 +265,7 @@ public function apply(EntityInterface $entity) {
     $entity_type_id = $entity->getEntityTypeId();
     // @todo should whatever invokes this method be providing the context?
     $context = new Context(new ContextDefinition('entity:' . $entity_type_id), $entity);
+
     /** @var \Drupal\commerce_promotion\Plugin\Commerce\PromotionOffer\PromotionOfferInterface $offer */
     $offer = $this->get('offer')->first()->getTargetInstance([$entity_type_id => $context]);
     $offer->execute();
@@ -320,6 +343,15 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
         'weight' => 3,
       ]);
 
+    $fields['conditions'] = BaseFieldDefinition::create('commerce_plugin_item:commerce_promotion_condition')
+      ->setLabel(t('Conditions'))
+      ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED)
+      ->setRequired(FALSE)
+      ->setDisplayOptions('form', [
+        'type' => 'commerce_plugin_select',
+        'weight' => 3,
+      ]);
+
     $fields['coupons'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('Coupons'))
       ->setDescription(t('Coupons which allow promotion to be redeemed.'))
diff --git a/modules/promotion/src/Entity/PromotionInterface.php b/modules/promotion/src/Entity/PromotionInterface.php
index 72867d98f0..0b7b171b33 100644
--- a/modules/promotion/src/Entity/PromotionInterface.php
+++ b/modules/promotion/src/Entity/PromotionInterface.php
@@ -214,7 +214,18 @@ public function isEnabled();
   public function setEnabled($enabled);
 
   /**
-   * Applies the promotion to an entity.
+   * Checks whether the promotion entity can be applied.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity.
+   *
+   * @return bool
+   *   TRUE if promotion can be applied, or false if conditions failed.
+   */
+  public function applies(EntityInterface $entity);
+
+  /**
+   * Apply the promotion to an entity.
    *
    * @param \Drupal\Core\Entity\EntityInterface $entity
    *   The entity.
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalPrice.php b/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalPrice.php
new file mode 100644
index 0000000000..3715161ff4
--- /dev/null
+++ b/modules/promotion/src/Plugin/Commerce/PromotionCondition/OrderTotalPrice.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition;
+
+use Drupal\commerce_price\Price;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides an 'Order: Total amount comparison' condition.
+ *
+ * @CommercePromotionCondition(
+ *   id = "commerce_promotion_order_total_price",
+ *   label = @Translation("Total amount"),
+ *   target_entity_type = "commerce_order",
+ * )
+ */
+class OrderTotalPrice extends PromotionConditionBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'amount' => NULL,
+      // @todo expose the operator in form.
+      'operator' => '>',
+    ] + parent::defaultConfiguration();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form += parent::buildConfigurationForm($form, $form_state);
+
+    $default_price = NULL;
+    if (!empty($this->configuration['amount']['amount'])) {
+      $default_price = new Price($this->configuration['amount']['amount'], $this->configuration['amount']['currency_code']);
+    }
+
+    $form['amount'] = [
+      '#type' => 'commerce_price',
+      '#title' => t('Amount'),
+      '#default_value' => $default_price,
+      '#required' => TRUE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function evaluate() {
+    /** @var \Drupal\commerce_order\Entity\OrderInterface $order */
+    $order = $this->getTargetEntity();
+    /** @var \Drupal\commerce_price\Price $total_price */
+    $total_price = $order->getTotalPrice();
+    /** @var \Drupal\commerce_price\Price $comparison_price */
+    $comparison_price = $this->configuration['amount'];
+
+    switch ($this->configuration['operator']) {
+      case '==':
+        return $total_price->equals($comparison_price);
+
+      case '>=':
+        return $total_price->greaterThanOrEqual($comparison_price);
+
+      case '>':
+        return $total_price->greaterThan($comparison_price);
+
+      case '<=':
+        return $total_price->lessThanOrEqual($comparison_price);
+
+      case '<':
+        return $total_price->lessThan($comparison_price);
+
+      default:
+        throw new \InvalidArgumentException("Invalid operator {$this->configuration['operator']}");
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function summary() {
+    return $this->t('Compares the order total amount.');
+  }
+
+}
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionBase.php b/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionBase.php
new file mode 100644
index 0000000000..ccabb33c6d
--- /dev/null
+++ b/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionBase.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition;
+
+use Drupal\Core\Condition\ConditionPluginBase;
+
+/**
+ * Base class for Promotion Condition plugins.
+ */
+abstract class PromotionConditionBase extends ConditionPluginBase implements PromotionConditionInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTargetEntityType() {
+    return $this->pluginDefinition['target_entity_type'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTargetEntity() {
+    return $this->getContextValue($this->getTargetEntityType());
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute() {
+    $result = $this->evaluate();
+    return $this->isNegated() ? !$result : $result;
+  }
+
+}
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionInterface.php b/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionInterface.php
new file mode 100644
index 0000000000..8ab145b0c9
--- /dev/null
+++ b/modules/promotion/src/Plugin/Commerce/PromotionCondition/PromotionConditionInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition;
+
+use Drupal\Core\Condition\ConditionInterface;
+
+/**
+ * Defines an interface for Condition plugins.
+ */
+interface PromotionConditionInterface extends ConditionInterface {
+
+  /**
+   * Gets the entity type the condition is for.
+   *
+   * @return string
+   *   The entity type it applies to.
+   */
+  public function getTargetEntityType();
+
+  /**
+   * Get the target entity for the offer.
+   *
+   * @return \Drupal\Core\Entity\EntityInterface
+   *   The target entity.
+   */
+  public function getTargetEntity();
+
+}
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionOffer/ProductPercentageOff.php b/modules/promotion/src/Plugin/Commerce/PromotionOffer/ProductPercentageOff.php
index 0fe51118b1..3e91e47008 100644
--- a/modules/promotion/src/Plugin/Commerce/PromotionOffer/ProductPercentageOff.php
+++ b/modules/promotion/src/Plugin/Commerce/PromotionOffer/ProductPercentageOff.php
@@ -19,7 +19,7 @@ class ProductPercentageOff extends PercentageOffBase {
   public function execute() {
     /** @var \Drupal\commerce_order\Entity\LineItemInterface $line_item */
     $line_item = $this->getTargetEntity();
-    $price_amount = $line_item->getTotalPrice()->multiply($this->getAmount());
+    $price_amount = $line_item->getUnitPrice()->multiply($this->getAmount());
     $this->applyAdjustment($line_item, $price_amount);
   }
 
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferBase.php b/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferBase.php
index 639200914e..731dda0639 100644
--- a/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferBase.php
+++ b/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferBase.php
@@ -28,7 +28,7 @@ public function __construct(array $configuration, $plugin_id, $plugin_definition
   /**
    * {@inheritdoc}
    */
-  public function appliesTo() {
+  public function getTargetEntityType() {
     return $this->pluginDefinition['target_entity_type'];
   }
 
@@ -36,7 +36,7 @@ public function appliesTo() {
    * {@inheritdoc}
    */
   public function getTargetEntity() {
-    return $this->getContextValue($this->appliesTo());
+    return $this->getContextValue($this->getTargetEntityType());
   }
 
   /**
diff --git a/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferInterface.php b/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferInterface.php
index 68fc98c077..fecb9347c6 100644
--- a/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferInterface.php
+++ b/modules/promotion/src/Plugin/Commerce/PromotionOffer/PromotionOfferInterface.php
@@ -19,12 +19,12 @@ interface PromotionOfferInterface extends ExecutableInterface, PluginFormInterfa
   const LINE_ITEM = 'commerce_line_item';
 
   /**
-   * Returns what entity the promotion offer applies to.
+   * Gets the entity type the offer is for.
    *
    * @return string
    *   The entity type it applies to.
    */
-  public function appliesTo();
+  public function getTargetEntityType();
 
   /**
    * Get the target entity for the offer.
diff --git a/modules/promotion/src/PromotionConditionManager.php b/modules/promotion/src/PromotionConditionManager.php
new file mode 100644
index 0000000000..567bbf1f70
--- /dev/null
+++ b/modules/promotion/src/PromotionConditionManager.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Drupal\commerce_promotion;
+
+use Drupal\Component\Plugin\CategorizingPluginManagerInterface;
+use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Plugin\Context\ContextDefinition;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Executable\ExecutableManagerInterface;
+use Drupal\Core\Executable\ExecutableInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\CategorizingPluginManagerTrait;
+use Drupal\Core\Plugin\Context\ContextAwarePluginManagerTrait;
+use Drupal\Core\Plugin\DefaultPluginManager;
+
+/**
+ * Manages discovery and instantiation of promotion condition plugins.
+ *
+ * @see \Drupal\commerce_promotion\Annotation\CommercePromotionCondition
+ * @see plugin_api
+ */
+class PromotionConditionManager extends DefaultPluginManager implements ExecutableManagerInterface, CategorizingPluginManagerInterface {
+
+  use CategorizingPluginManagerTrait;
+  use ContextAwarePluginManagerTrait;
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a new PromotionConditionManager object.
+   *
+   * @param \Traversable $namespaces
+   *   An object that implements \Traversable which contains the root paths
+   *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend instance to use.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler to invoke the alter hook with.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type handler.
+   */
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler, EntityTypeManagerInterface $entity_type_manager) {
+    parent::__construct('Plugin/Commerce/PromotionCondition', $namespaces, $module_handler, 'Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition\PromotionConditionInterface', 'Drupal\commerce_promotion\Annotation\CommercePromotionCondition');
+
+    $this->alterInfo('condition_info');
+    $this->setCacheBackend($cache_backend, 'condition_plugins');
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute(ExecutableInterface $condition) {
+    /** @var \Drupal\commerce_promotion\Plugin\Commerce\PromotionCondition\PromotionConditionInterface $condition */
+    $result = $condition->evaluate();
+    return $condition->isNegated() ? !$result : $result;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processDefinition(&$definition, $plugin_id) {
+    parent::processDefinition($definition, $plugin_id);
+
+    foreach (['id', 'label', 'target_entity_type'] as $required_property) {
+      if (empty($definition[$required_property])) {
+        throw new PluginException(sprintf('The promotion condition %s must define the %s property.', $plugin_id, $required_property));
+      }
+    }
+
+    $target = $definition['target_entity_type'];
+    if (!$this->entityTypeManager->getDefinition($target)) {
+      throw new PluginException(sprintf('The promotion condition %s must reference a valid entity type, %s given.', $plugin_id, $target));
+    }
+
+    // If the plugin did not specify a category, use the target entity's label.
+    if (empty($definition['category'])) {
+      $definition['category'] = $this->entityTypeManager->getDefinition($target)->getLabel();
+    }
+
+    // Generate the context definition if it is missing.
+    if (empty($definition['context'][$target])) {
+      $definition['context'][$target] = new ContextDefinition('entity:' . $target, $definition['category']);
+    }
+  }
+
+}
diff --git a/modules/promotion/tests/src/FunctionalJavascript/PromotionTest.php b/modules/promotion/tests/src/FunctionalJavascript/PromotionTest.php
index 3ed300586b..07df50f855 100644
--- a/modules/promotion/tests/src/FunctionalJavascript/PromotionTest.php
+++ b/modules/promotion/tests/src/FunctionalJavascript/PromotionTest.php
@@ -35,24 +35,33 @@ protected function getAdministratorPermissions() {
 
   /**
    * Tests creating a promotion.
+   *
+   * @group create
    */
   public function testCreatePromotion() {
     $this->createStore(NULL, NULL, 'default', TRUE);
 
     $this->drupalGet('admin/commerce/promotions');
     $this->getSession()->getPage()->clickLink('Add a new promotion');
+    $this->drupalGet('promotion/add');
 
     // Check the integrity of the form.
     $this->assertSession()->fieldExists('name[0][value]');
 
     $this->getSession()->getPage()->fillField('offer[0][target_plugin_id]', 'commerce_promotion_product_percentage_off');
-    $this->getSession()->wait(4000);
+    $this->getSession()->wait(2000, "jQuery('.ajax-progress').length === 0");
 
     $name = $this->randomMachineName(8);
     $edit = [
       'name[0][value]' => $name,
       'offer[0][target_plugin_configuration][amount]' => '10.0',
     ];
+
+    $this->getSession()->getPage()->fillField('conditions[0][target_plugin_id]', 'commerce_promotion_order_total_price');
+    $this->getSession()->wait(2000, "jQuery('.ajax-progress').length === 0");
+
+    $edit['conditions[0][target_plugin_configuration][amount][amount]'] = '50.00';
+
     $this->submitForm($edit, t('Save'));
     $this->assertSession()->pageTextContains("The promotion $name has been successfully saved.");
     $promotion_count = $this->getSession()->getPage()->find('xpath', '//table/tbody/tr/td[text()="' . $name . '"]');
diff --git a/modules/promotion/tests/src/Kernel/PromotionConditionTest.php b/modules/promotion/tests/src/Kernel/PromotionConditionTest.php
new file mode 100644
index 0000000000..0ae1777904
--- /dev/null
+++ b/modules/promotion/tests/src/Kernel/PromotionConditionTest.php
@@ -0,0 +1,162 @@
+<?php
+
+namespace Drupal\Tests\commerce_promotion\Kernel;
+
+use Drupal\commerce_order\Entity\LineItem;
+use Drupal\commerce_order\Entity\LineItemType;
+use Drupal\commerce_order\Entity\Order;
+use Drupal\commerce_price\Price;
+use Drupal\commerce_promotion\Entity\Promotion;
+use Drupal\commerce_store\StoreCreationTrait;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests promotion conditions.
+ *
+ * @group commerce
+ */
+class PromotionConditionTest extends KernelTestBase {
+
+  use StoreCreationTrait;
+
+  /**
+   * The default store.
+   *
+   * @var \Drupal\commerce_store\Entity\StoreInterface
+   */
+  protected $store;
+
+  /**
+   * The condition manager.
+   *
+   * @var \Drupal\commerce_promotion\PromotionConditionManager
+   */
+  protected $conditionManager;
+
+  /**
+   * The test order.
+   *
+   * @var \Drupal\commerce_order\Entity\OrderInterface
+   */
+  protected $order;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['system', 'field', 'options', 'user', 'views', 'profile',
+    'text', 'entity', 'commerce', 'commerce_price', 'address', 'commerce_order',
+    'commerce_store', 'commerce_product', 'inline_entity_form', 'commerce_promotion',
+    'state_machine', 'datetime',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installEntitySchema('commerce_store');
+    $this->installEntitySchema('profile');
+    $this->installEntitySchema('commerce_order');
+    $this->installEntitySchema('commerce_order_type');
+    $this->installEntitySchema('commerce_line_item');
+    $this->installEntitySchema('commerce_promotion');
+    $this->installConfig([
+      'profile',
+      'commerce_order',
+      'commerce_store',
+      'commerce_promotion',
+    ]);
+    $this->store = $this->createStore(NULL, NULL, 'default', TRUE);
+
+    // A line item type that doesn't need a purchasable entity, for simplicity.
+    LineItemType::create([
+      'id' => 'test',
+      'label' => 'Test',
+      'orderType' => 'default',
+    ])->save();
+
+    $this->order = Order::create([
+      'type' => 'default',
+      'state' => 'completed',
+      'mail' => 'test@example.com',
+      'ip_address' => '127.0.0.1',
+      'order_number' => '6',
+      'store_id' => $this->store,
+      'line_items' => [],
+    ]);
+  }
+
+  /**
+   * Tests the order amount condition.
+   */
+  public function testOrderTotal() {
+    // Use addLineItem so the total is calculated.
+    $line_item = LineItem::create([
+      'type' => 'test',
+      'quantity' => 2,
+      'unit_price' => [
+        'amount' => '20.00',
+        'currency_code' => 'USD',
+      ],
+    ]);
+    $line_item->save();
+    $this->order->addLineItem($line_item);
+
+    // Starts now, enabled. No end time.
+    $promotion = Promotion::create([
+      'name' => 'Promotion 1',
+      'order_types' => [$this->order->bundle()],
+      'stores' => [$this->store->id()],
+      'status' => TRUE,
+      'offer' => [
+        'target_plugin_id' => 'commerce_promotion_order_percentage_off',
+        'target_plugin_configuration' => [
+          'amount' => '0.10',
+        ],
+      ],
+      'conditions' => [
+        [
+          'target_plugin_id' => 'commerce_promotion_order_total_price',
+          'target_plugin_configuration' => [
+            'amount' => new Price('20.00', 'USD'),
+          ],
+        ],
+      ],
+    ]);
+    $promotion->save();
+
+    $result = $promotion->applies($this->order);
+
+    $this->assertTrue($result);
+
+    $promotion = Promotion::create([
+      'name' => 'Promotion 1',
+      'order_types' => [$this->order->bundle()],
+      'stores' => [$this->store->id()],
+      'status' => TRUE,
+      'offer' => [
+        'target_plugin_id' => 'commerce_promotion_order_percentage_off',
+        'target_plugin_configuration' => [
+          'amount' => '0.10',
+        ],
+      ],
+      'conditions' => [
+        [
+          'target_plugin_id' => 'commerce_promotion_order_total_price',
+          'target_plugin_configuration' => [
+            'amount' => new Price('50.00', 'USD'),
+          ],
+        ],
+      ],
+    ]);
+    $promotion->save();
+
+    $result = $promotion->applies($this->order);
+
+    $this->assertFalse($result);
+  }
+
+}
diff --git a/modules/promotion/tests/src/Kernel/PromotionOfferTest.php b/modules/promotion/tests/src/Kernel/PromotionOfferTest.php
index 7746dad3e4..da1288a109 100644
--- a/modules/promotion/tests/src/Kernel/PromotionOfferTest.php
+++ b/modules/promotion/tests/src/Kernel/PromotionOfferTest.php
@@ -5,6 +5,7 @@
 use Drupal\commerce_order\Entity\LineItem;
 use Drupal\commerce_order\Entity\LineItemType;
 use Drupal\commerce_order\Entity\Order;
+use Drupal\commerce_price\Price;
 use Drupal\commerce_promotion\Entity\Promotion;
 use Drupal\commerce_store\StoreCreationTrait;
 use Drupal\KernelTests\KernelTestBase;
@@ -94,7 +95,7 @@ public function testOrderPercentageOff() {
     // Use addLineItem so the total is calculated.
     $line_item = LineItem::create([
       'type' => 'test',
-      'quantity' => 2,
+      'quantity' => '2',
       'unit_price' => [
         'amount' => '20.00',
         'currency_code' => 'USD',
@@ -125,7 +126,7 @@ public function testOrderPercentageOff() {
     $promotion->apply($this->order);
 
     $this->assertEquals(1, count($this->order->getAdjustments()));
-    $this->assertEquals(36, $this->order->total_price->amount);
+    $this->assertEquals(new Price('36.00', 'USD'), $this->order->getTotalPrice());
 
   }
 
@@ -136,7 +137,7 @@ public function testProductPercentageOff() {
     // Use addLineItem so the total is calculated.
     $line_item = LineItem::create([
       'type' => 'test',
-      'quantity' => 2,
+      'quantity' => '2',
       'unit_price' => [
         'amount' => '10.00',
         'currency_code' => 'USD',
@@ -164,8 +165,20 @@ public function testProductPercentageOff() {
     $this->assertEquals('0.50', $offer_field->target_plugin_configuration['amount']);
 
     $promotion->apply($line_item);
+    $line_item->save();
+
+    $adjustments = $line_item->getAdjustments();
+    $this->assertEquals(1, count($adjustments));
+    /** @var \Drupal\commerce_order\Adjustment $adjustment */
+    $adjustment = reset($adjustments);
+    // Adjustment for 50% of the line item total.
+    $this->assertEquals(new Price('-5.00', 'USD'), $adjustment->getAmount());
+    // Adjustments don't affect total line item price, but the order's total.
+    $this->assertEquals(new Price('20.00', 'USD'), $line_item->getTotalPrice());
 
-    $this->assertEquals(10, $line_item->getTotalPrice()->getDecimalAmount());
+    $this->order->addLineItem($line_item);
+    $this->assertEquals(1, count($this->order->getLineItems()));
+    $this->assertEquals(new Price('10.00', 'USD'), $this->order->getTotalPrice());
   }
 
 }
diff --git a/src/Plugin/Field/FieldType/PluginItemDeriver.php b/src/Plugin/Field/FieldType/PluginItemDeriver.php
index aa7421f933..ad01646fe9 100644
--- a/src/Plugin/Field/FieldType/PluginItemDeriver.php
+++ b/src/Plugin/Field/FieldType/PluginItemDeriver.php
@@ -19,6 +19,7 @@ public function getDerivativeDefinitions($base_plugin_definition) {
       'condition' => $this->t('Conditions'),
       'action' => $this->t('Action'),
       'commerce_promotion_offer' => $this->t('Promotion offer'),
+      'commerce_promotion_condition' => $this->t('Promotion condition'),
     ];
 
     foreach ($supported as $id => $label) {