[API][Tax rate] Implement deleting_tax_rate feature

features/taxation/managing_tax_rates/deleting_tax_rate.feature

@@ -10,7 +10,7 @@ Feature: Deleting a tax rate
         And the store has "United States Sales Tax" tax rate of 20% for "Sports gear" within the "US" zone
         And I am logged in as an administrator
 
-    @ui
+    @ui @api
     Scenario: Deleted tax rate should disappear from the registry
         When I delete tax rate "United States Sales Tax"
         Then I should be notified that it has been successfully deleted

src/Sylius/Behat/Context/Api/Admin/ManagingTaxRateContext.php

@@ -150,4 +150,36 @@ public function theTaxRateShouldIncludePrice(TaxRateInterface $taxRate): void
             sprintf('Tax rate does is not included in price')
         );
     }
+
+    /**
+     * @When I delete tax rate :taxRate
+     */
+    public function iDeleteTaxRate(TaxRateInterface $taxRate): void
+    {
+        $this->client->delete((string) $taxRate->getId());
+    }
+
+    /**
+     * @Then I should be notified that it has been successfully deleted
+     */
+    public function iShouldBeNotifiedThatItHasBeenSuccessfullyDeleted(): void
+    {
+        Assert::true(
+            $this->responseChecker->isDeletionSuccessful($this->client->getLastResponse()),
+            'Tax rate could not be deleted'
+        );
+    }
+
+    /**
+     * @Then /^(this tax rate) should no longer exist in the registry$/
+     */
+    public function thisTaxRateShouldNoLongerExistInTheRegistry(TaxRateInterface $taxRate): void
+    {
+        $name = $taxRate->getName();
+
+        Assert::false(
+            $this->responseChecker->hasItemWithValue($this->client->index(), 'name', $name),
+            sprintf('Tax rate with name %s exists', $name)
+        );
+    }
 }

src/Sylius/Bundle/ApiBundle/Resources/config/api_resources/TaxRate.xml

@@ -36,6 +36,10 @@
             <itemOperation name="admin_get">
                 <attribute name="method">GET</attribute>
             </itemOperation>
+
+            <itemOperation name="admin_delete">
+                <attribute name="method">DELETE</attribute>
+            </itemOperation>
         </itemOperations>
     </resource>
 </resources>