Add the E2E tests for the CLI interface.

features/backup_plan_cli_add.feature

@@ -0,0 +1,15 @@
+Feature: Creating a backup plan with the CLI
+
+  @fixture.injector
+  @fixture.in_memory_database
+  @fixture.cli
+  Scenario Outline: Create an new unique backup plan with the CLI
+    Given the CLI arguments are "<arguments>"
+    When I run the CLI
+    Then the CLI executed successfully
+
+    Examples:
+      | arguments                                                  |
+      | plans add --label my_label --source /mnt -d /mnt2 -d /mnt3 |
+      | plans add --label label2   --source /mnt -d /mnt2 -d /mnt3 |
+

features/backup_plan_model.feature

@@ -1,4 +1,4 @@
-Feature: Creating the source
+Feature: Creating a backup plan
 
   @fixture.injector
   @fixture.in_memory_database

features/environment.py

@@ -1,10 +1,24 @@
 from behave import fixture, use_fixture
 from injector import Injector
+from typer.testing import CliRunner
 
 from tui_rsync.core.components.backup_plan.application.repository.backup_plan_repository import BackupPlanRepository
 from tui_rsync.core.components.backup_plan.application.services.backup_plan_service import BackupPlanService
 from tui_rsync.infrastructure.configuration import TestingConfiguration, CurrentConfiguration
 from tui_rsync.infrastructure.orm import InMemoryDatabaseManager
+from tui_rsync.user_interface.cli.cli import cli_app
+
+
+@fixture
+def setup_cli_runner(context):
+    context.cli_runner = CliRunner()
+    yield context.cli_runner
+
+
+@fixture
+def setup_cli_app(context):
+    context.cli_app = cli_app
+    yield context.cli_app
 
 
 @fixture
@@ -33,3 +47,6 @@ def before_tag(context, tag):
         use_fixture(setup_in_memory_database_manager, context)
     if tag == "fixture.backup_plan_service":
         use_fixture(setup_backup_plan_service, context)
+    if tag == "fixture.cli":
+        use_fixture(setup_cli_app, context)
+        use_fixture(setup_cli_runner, context)

features/steps/cli_runner_steps.py

@@ -0,0 +1,34 @@
+from behave import given, when, then
+
+
+@given('the CLI arguments are "{arguments}"')
+def given_cli_arguments(context, arguments):
+    print(f"{arguments}")
+    context.arguments = arguments.split()
+    print(f"{context.arguments}")
+
+
+@when('I run the CLI')
+def when_run_cli(context):
+    context.cli_result = context.cli_runner.invoke(context.cli_app, context.arguments)
+
+
+@then('the CLI executed successfully')
+def then_cli_executed_successfully(context):
+    assert context.cli_result.exit_code == 0
+
+
+@then('the CLI executed with an error')
+def then_cli_executed_with_error(context):
+    assert context.cli_result.exit_code == 0
+
+
+@then('the CLI output contains "{string}"')
+def then_cli_output_contains(context, string):
+    assert string in context.cli_result.stdout
+
+
+@then('the CLI contains the error: "{string}"')
+def then_cli_output_contains_error(context, string):
+    assert string in context.cli_result.stdout
+