Add persian-tutor: Gradio-based GCSE Persian language learning app

Vocabulary study with FSRS spaced repetition, AI tutoring (Ollama/Claude),
essay marking, idioms browser, Anki export, and dashboard. 918 vocabulary
entries across 39 categories. 41 tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python/persian-tutor/tests/test_anki_export.py

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+"""Tests for anki_export.py — Anki .apkg generation."""
+
+import os
+import sys
+import tempfile
+import zipfile
+from pathlib import Path
+
+import pytest
+
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from anki_export import export_deck
+
+SAMPLE_VOCAB = [
+    {
+        "id": "verb_go",
+        "section": "High-frequency language",
+        "category": "Common verbs",
+        "english": "to go",
+        "persian": "رفتن",
+        "finglish": "raftan",
+    },
+    {
+        "id": "verb_eat",
+        "section": "High-frequency language",
+        "category": "Common verbs",
+        "english": "to eat",
+        "persian": "خوردن",
+        "finglish": "khordan",
+    },
+    {
+        "id": "colour_red",
+        "section": "High-frequency language",
+        "category": "Colours",
+        "english": "red",
+        "persian": "قرمز",
+        "finglish": "ghermez",
+    },
+]
+
+
+def test_export_deck_creates_file(tmp_path):
+    """export_deck should create a valid .apkg file."""
+    output = str(tmp_path / "test.apkg")
+    result = export_deck(SAMPLE_VOCAB, output_path=output)
+    assert result == output
+    assert os.path.exists(output)
+    assert os.path.getsize(output) > 0
+
+
+def test_export_deck_is_valid_zip(tmp_path):
+    """An .apkg file is a zip archive containing an Anki SQLite database."""
+    output = str(tmp_path / "test.apkg")
+    export_deck(SAMPLE_VOCAB, output_path=output)
+    assert zipfile.is_zipfile(output)
+
+
+def test_export_deck_with_category_filter(tmp_path):
+    """export_deck with category filter should only include matching entries."""
+    output = str(tmp_path / "test.apkg")
+    export_deck(SAMPLE_VOCAB, categories=["Colours"], output_path=output)
+    # File should exist and be smaller than unfiltered
+    assert os.path.exists(output)
+    size_filtered = os.path.getsize(output)
+
+    output2 = str(tmp_path / "test_all.apkg")
+    export_deck(SAMPLE_VOCAB, output_path=output2)
+    size_all = os.path.getsize(output2)
+
+    # Filtered deck should be smaller (fewer cards)
+    assert size_filtered <= size_all
+
+
+def test_export_deck_empty_vocab(tmp_path):
+    """export_deck with empty vocabulary should still create a valid file."""
+    output = str(tmp_path / "test.apkg")
+    export_deck([], output_path=output)
+    assert os.path.exists(output)
+
+
+def test_export_deck_no_category_match(tmp_path):
+    """export_deck with non-matching category filter should create empty deck."""
+    output = str(tmp_path / "test.apkg")
+    export_deck(SAMPLE_VOCAB, categories=["Nonexistent"], output_path=output)
+    assert os.path.exists(output)