Uc001 Create Task

# specs/features/UC001-create-task.feature
#
# SINGLE SOURCE OF TRUTH for UC001 behaviour.
# This file is:
#   (1) referenced by specs/use_cases/UC001-create-task.md  (documentation)
#   (2) executed by the acceptance test suite               (living documentation)
#
# Rules:
#   - Scenario IDs (e.g. UC001-S01) must match the use case document.
#   - Step definitions live in: src/test/java/.../steps/
#   - Keep scenarios focused: one behaviour per scenario.
#   - Use exact terms from specs/glossary.md.

Feature: Create Task
  As a User
  I want to create a new Task
  So that I can track a unit of work

  Background:
    Given the task list is empty

  # ---------------------------------------------------------------------------
  # Happy path
  # ---------------------------------------------------------------------------

  Scenario: UC001-S01 Successfully create a task with all fields
    When the User creates a task with title "Fix login bug", description "Session cookie missing", status "TODO", and due date "2026-06-30"
    Then the response status is 201
    And the response contains a task with title "Fix login bug"
    And the response contains a task with description "Session cookie missing"
    And the response contains a task with status "TODO"
    And the response contains a task with due date "2026-06-30"
    And the response contains a task with a non-null id
    And the response contains a task with a non-null createdAt

  Scenario: UC001-S02 Successfully create a task with only required fields
    When the User creates a task with title "Minimal task" and status "IN_PROGRESS"
    Then the response status is 201
    And the response contains a task with title "Minimal task"
    And the response contains a task with status "IN_PROGRESS"
    And the response contains a task with a null description
    And the response contains a task with a null due date

  # ---------------------------------------------------------------------------
  # Validation — BR-001: Title is required
  # ---------------------------------------------------------------------------

  Scenario: UC001-S03 Reject task creation when title is blank
    When the User creates a task with title "" and status "TODO"
    Then the response status is 400
    And the response error code is "TASK_TITLE_REQUIRED"

  Scenario: UC001-S04 Reject task creation when title is null
    When the User creates a task with a null title and status "TODO"
    Then the response status is 400
    And the response error code is "TASK_TITLE_REQUIRED"

  # ---------------------------------------------------------------------------
  # Validation — BR-002: Title max 100 characters
  # ---------------------------------------------------------------------------

  Scenario: UC001-S05 Reject task creation when title exceeds 100 characters
    When the User creates a task with a title of 101 characters and status "TODO"
    Then the response status is 400
    And the response error code is "TASK_TITLE_TOO_LONG"

  # ---------------------------------------------------------------------------
  # Validation — BR-003: Description max 500 characters
  # ---------------------------------------------------------------------------

  Scenario: UC001-S06 Reject task creation when description exceeds 500 characters
    When the User creates a task with title "Valid title", a description of 501 characters, and status "TODO"
    Then the response status is 400
    And the response error code is "TASK_DESCRIPTION_TOO_LONG"

  # ---------------------------------------------------------------------------
  # Validation — BR-006: Due date must be a valid date
  # ---------------------------------------------------------------------------

  Scenario: UC001-S07 Reject task creation when due date is not a valid date
    When the User creates a task with title "Valid title", status "TODO", and due date "not-a-date"
    Then the response status is 400
    And the response error code is "TASK_DUE_DATE_INVALID"