MIL-008: Choose level

Review record RC-041 (Go, autonomous mode, not independent).

Task: MIL-008#1
Task: MIL-008#2
Task: MIL-008#3
Task: MIL-008#4
Task: MIL-008#5
Task: MIL-008#6
Task: MIL-008#7
Task: MIL-008#8

tests/unit/test_level_view_model.py

@@ -0,0 +1,46 @@
+"""Tests of the level view model."""
+
+import dataclasses
+
+import pytest
+
+from flash_card.constants import LEVEL_TITLE
+from flash_card.domain.value_objects.level import Level
+from flash_card.presentation.features.level import level_view_model
+from flash_card.presentation.features.level.level_view_model import (
+    LevelChoice,
+    LevelViewModel,
+)
+
+
+def test_title_is_choose_your_level() -> None:
+    assert LevelViewModel().title == LEVEL_TITLE == "Choose your level"
+
+
+def test_choices_are_three_levels_in_order() -> None:
+    choices = LevelViewModel().choices
+    assert [choice.label for choice in choices] == [
+        "100 words",
+        "1000 words",
+        "All words",
+    ]
+    assert [choice.level for choice in choices] == [
+        Level(100),
+        Level(1000),
+        Level(None),
+    ]
+
+
+def test_choices_come_from_given_choices() -> None:
+    model = LevelViewModel([("Ten", 10)])
+    assert model.choices == (LevelChoice("Ten", Level(10)),)
+
+
+def test_choice_is_frozen() -> None:
+    choice = LevelChoice("Ten", Level(10))
+    with pytest.raises(dataclasses.FrozenInstanceError):
+        choice.label = "x"  # type: ignore[misc]
+
+
+def test_view_model_module_does_not_import_tkinter() -> None:
+    assert "tkinter" not in vars(level_view_model)