Create hurl test for updating tasks.

backend/tests/api/update_tasks.hurl

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+# Task Update API Tests
+
+# Setup: Create a task to update
+POST {{host}}/api/tasks
+Content-Type: application/json
+{
+  "title": "Original Task",
+  "description": "Original description"
+}
+
+HTTP 201
+[Captures]
+task_id: jsonpath "$.id"
+created_at: jsonpath "$.created_at"
+
+# Test: Update task title only
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "title": "Updated Task Title"
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.title" == "Updated Task Title"
+jsonpath "$.description" == "Original description"
+jsonpath "$.status" == "todo"
+jsonpath "$.updated_at" != "{{created_at}}"
+
+# Test: Update description only
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "description": "Updated description"
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.title" == "Updated Task Title"
+jsonpath "$.description" == "Updated description"
+jsonpath "$.status" == "todo"
+
+# Test: Update status to done
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "status": "done"
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.status" == "done"
+jsonpath "$.completed_at" exists
+
+# Test: Update status to backlog
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "status": "backlog"
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.status" == "backlog"
+jsonpath "$.completed_at" == null
+
+# Test: Update multiple fields together
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "title": "Completely Updated Task",
+  "description": "Completely updated description",
+  "status": "done"
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.title" == "Completely Updated Task"
+jsonpath "$.description" == "Completely updated description"
+jsonpath "$.status" == "done"
+jsonpath "$.completed_at" exists
+
+# Test: Clear description (set to null)
+PUT {{host}}/api/tasks/{{task_id}}
+Content-Type: application/json
+{
+  "description": null
+}
+
+HTTP 200
+[Asserts]
+jsonpath "$.id" == "{{task_id}}"
+jsonpath "$.description" == null
+
+# Setup: Create another task for error tests
+POST {{host}}/api/tasks
+Content-Type: application/json
+{
+  "title": "Task for Error Tests"
+}
+
+HTTP 201
+[Captures]
+error_test_task_id: jsonpath "$.id"
+
+# Test: Update non-existent task
+PUT {{host}}/api/tasks/00000000-0000-0000-0000-000000000000
+Content-Type: application/json
+{
+  "title": "This should fail"
+}
+
+HTTP 404
+[Asserts]
+jsonpath "$.error" exists
+
+# Test: Update with invalid UUID format
+PUT {{host}}/api/tasks/invalid-uuid-format
+Content-Type: application/json
+{
+  "title": "This should also fail"
+}
+
+HTTP 400
+[Asserts]
+jsonpath "$.error" exists
+
+# Test: Update with empty title
+PUT {{host}}/api/tasks/{{error_test_task_id}}
+Content-Type: application/json
+{
+  "title": ""
+}
+
+HTTP 422
+[Asserts]
+jsonpath "$.error" exists
+
+# Test: Update with invalid status
+PUT {{host}}/api/tasks/{{error_test_task_id}}
+Content-Type: application/json
+{
+  "status": "invalid_status"
+}
+
+HTTP 422
+[Asserts]
+jsonpath "$.error" exists
+
+# Test: Update with no fields (empty object)
+PUT {{host}}/api/tasks/{{error_test_task_id}}
+Content-Type: application/json
+{}
+
+HTTP 422
+[Asserts]
+jsonpath "$.error" exists