add tests (#18)

* add tests

* add sentencepiece dependency

tests/test_ocr.py

@@ -0,0 +1,16 @@
+import json
+from pathlib import Path
+
+from manga_ocr import MangaOcr
+
+TEST_DATA_ROOT = Path(__file__).parent / 'data'
+
+
+def test_ocr():
+    mocr = MangaOcr()
+
+    expected_results = json.loads((TEST_DATA_ROOT / 'expected_results.json').read_text(encoding='utf-8'))
+
+    for item in expected_results:
+        result = mocr(TEST_DATA_ROOT / 'images' / item['filename'])
+        assert result == item['result']