Update the test to verify creating the backup plan.

features/creating_backup_plan.feature

@@ -0,0 +1,16 @@
+Feature: Creating the source
+
+  Scenario Outline: Create an new unique backup plan
+    Given the label "<label>"
+    And the path "<source_path>"
+    And the destinations <destinations>
+    And the arguments "<arguments>"
+    When I create the backup plan
+    Then it should be created successfully
+
+    Examples:
+      | label | source_path | destinations                     | arguments      |
+      | usb   | /mnt/usb    | []                               | <empty>        |
+      | db    | /db         | ["/backup/db"]                   | -avuP          |
+      | temp  | /tmp        | ["/backup/tmp1", "/backup/tmp2"] | -avuP --delete |
+

features/steps/creating_backup_plan_steps.py

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+from behave import given, when, then
+import json
+from tui_rsync.core.components.backup_plan.domain import BackupPlan, Source, Destination
+
+
+@given('the label "{label}"')
+def given_source_label(context, label):
+    context.label = label
+
+
+@given('the path "{source_path}"')
+def given_source_path(context, source_path):
+    context.source_path = source_path
+
+
+@given('the destinations {destinations_json}')
+def given_source_destinations(context, destinations_json):
+    context.destinations = json.loads(destinations_json)
+
+
+@given('the arguments "{arguments}"')
+def given_source_arguments(context, arguments):
+    context.args = arguments
+
+    if arguments == "<empty>":
+        context.args = ""
+
+
+@when('I create the backup plan')
+def add_source(context):
+    try:
+        context.backup_plan = BackupPlan(
+            label=context.label,
+            source=Source(context.source_path),
+            destinations=map(lambda path: Destination(path), context.destinations),
+            #context.args,
+        )
+
+        #context.source = Source.get_source(context.label)
+    except Exception:
+        context.exception_raised = True
+    else:
+        context.exception_raised = False
+
+
+def compare_destinations(actual: list[Destination], expected: list[str]) -> bool:
+    actual_path_set = {destionation.path for destionation in actual}
+    return actual_path_set == set(expected)
+
+
+@then('it should be created successfully')
+def path_has_added(context):
+    assert context.exception_raised == False
+
+    assert context.backup_plan.label == context.label
+    assert context.backup_plan.source == Source(context.source_path)
+
+    print(f'{context.backup_plan.destinations=}')
+    print(f'{context.destinations=}')
+    assert compare_destinations(
+        context.backup_plan.destinations,
+        context.destinations
+    )
+    #assert context.source.args.command == context.args