Ensure workflow was trashed before deleting it

[MAILPOET-4540]

mailpoet/lib/Automation/Engine/Builder/DeleteWorkflowController.php

@@ -21,6 +21,11 @@ class DeleteWorkflowController {
     if (!$workflow) {
       throw Exceptions::workflowNotFound($id);
     }
+
+    if ($workflow->getStatus() !== Workflow::STATUS_TRASH) {
+      throw Exceptions::workflowNotTrashed($id);
+    }
+
     $this->workflowStorage->deleteWorkflow($workflow);
     return $workflow;
   }

mailpoet/lib/Automation/Engine/Exceptions.php

@@ -29,6 +29,7 @@ class Exceptions {
   private const WORKFLOW_STEP_MODIFIED_WHEN_UNKNOWN = 'mailpoet_automation_workflow_step_modified_when_unknown';
   private const WORKFLOW_NOT_VALID = 'mailpoet_automation_workflow_not_valid';
   private const MISSING_REQUIRED_SUBJECTS = 'mailpoet_automation_missing_required_subjects';
+  private const WORKFLOW_NOT_TRASHED = 'mailpoet_automation_workflow_not_trashed';
 
   public function __construct() {
     throw new InvalidStateException(
@@ -204,4 +205,11 @@ class Exceptions {
         )
       );
   }
+
+  public static function workflowNotTrashed(int $id): UnexpectedValueException {
+    return UnexpectedValueException::create()
+      ->withErrorCode(self::WORKFLOW_NOT_TRASHED)
+      // translators: %d is the ID of the workflow.
+      ->withMessage(sprintf(__("Can't delete workflow with ID '%d' because it was not trashed.", 'mailpoet'), $id));
+  }
 }

mailpoet/tests/integration/REST/Automation/Workflows/WorkflowsDeleteEndpointTest.php

@@ -48,7 +48,24 @@ class WorkflowsDeleteEndpointTest extends AutomationTest {
     $this->assertSame('Testing workflow', $workflow->getName());
   }
 
+  public function testCantDeleteWorkflowWhenNotTrashed(): void {
+    $data = $this->delete(sprintf(self::ENDPOINT_PATH, $this->workflow->getId()));
+
+    $this->assertSame([
+      'code' => 'mailpoet_automation_workflow_not_trashed',
+      'message' => "Can't delete workflow with ID '{$this->workflow->getId()}' because it was not trashed.",
+      'data' => ['status' => 400, 'errors' => []],
+    ], $data);
+
+    $workflow = $this->workflowStorage->getWorkflow($this->workflow->getId());
+    $this->assertInstanceOf(Workflow::class, $workflow);
+    $this->assertSame('Testing workflow', $workflow->getName());
+  }
+
   public function testItDeletesAWorkflow(): void {
+    $this->workflow->setStatus(Workflow::STATUS_TRASH);
+    $this->workflowStorage->updateWorkflow($this->workflow);
+
     $data = $this->delete(sprintf(self::ENDPOINT_PATH, $this->workflow->getId()));
     $this->assertSame(['data' => null], $data);