MIL-003: Step 2 - New flash cards

Review record RC-025 (Go, autonomous mode, not independent).

Task: MIL-003#1
Task: MIL-003#2
Task: MIL-003#3
Task: MIL-003#4
Task: MIL-003#5

tests/unit/test_flash_card_view_model.py

@@ -1,18 +1,53 @@
-"""Tests of the flash card view model.
+"""Tests of the flash card view model over a real session and in-memory deck."""
 
-@file test_flash_card_view_model.py
-@brief Checks the placeholder texts of FlashCardViewModel.
-"""
+from collections.abc import Sequence
 
-from flash_card.constants import PLACEHOLDER_LANGUAGE_NAME, PLACEHOLDER_WORD
+from flash_card.application.use_cases.study_session import StudySession
+from flash_card.constants import FINISHED_MESSAGE
+from flash_card.domain.entities.card import Card
+from flash_card.domain.entities.deck import Deck
+from flash_card.domain.value_objects.language_pair import LanguagePair
 from flash_card.presentation.features.flash_card.flash_card_view_model import (
     FlashCardViewModel,
 )
 
-
-def test_language_name_returns_placeholder() -> None:
-    assert FlashCardViewModel().language_name == PLACEHOLDER_LANGUAGE_NAME
+A = Card("aku", "mig")
+B = Card("kau", "du")
 
 
-def test_text_returns_placeholder_word() -> None:
-    assert FlashCardViewModel().text == PLACEHOLDER_WORD
+def _first(cards: Sequence[Card]) -> Card:
+    return cards[0]
+
+
+def _session(code: str, *cards: Card) -> StudySession:
+    return StudySession(Deck(LanguagePair(code, "da"), cards), _first)
+
+
+def test_view_model_draws_first_card_on_construction() -> None:
+    view_model = FlashCardViewModel(_session("ms", A, B))
+    assert view_model.text == "aku"
+    assert view_model.language_name == "Malay"
+    assert not view_model.is_finished
+
+
+def test_next_card_shows_next_card() -> None:
+    view_model = FlashCardViewModel(_session("ms", A, B))
+    view_model.next_card()
+    assert view_model.text == "kau"
+
+
+def test_language_name_shows_unknown_code_in_upper_case() -> None:
+    view_model = FlashCardViewModel(_session("xx", A))
+    assert view_model.language_name == "XX"
+
+
+def test_language_name_uses_given_names() -> None:
+    view_model = FlashCardViewModel(_session("ms", A), {"ms": "Melayu"})
+    assert view_model.language_name == "Melayu"
+
+
+def test_view_model_shows_finished_message_when_no_card_is_left() -> None:
+    view_model = FlashCardViewModel(_session("ms"))
+    assert view_model.is_finished
+    assert view_model.language_name == ""
+    assert view_model.text == FINISHED_MESSAGE