add unit tests

tests/test_clock/test_clock_ru.py

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+from datetime import time
+
+import pytest
+from saa.core.plugins import supported_languages
+from saa.core.watch import Watch
+
+Russian = supported_languages.get("ru")
+
+test_cases = [
+    (time(hour=2, minute=0), Russian, "два часа"),
+    (time(hour=5, minute=0), Russian, "пять часов"),
+    (time(hour=12, minute=50), Russian, "без десяти час"),
+    (time(hour=12, minute=55), Russian, "без пяти час"),
+    (time(hour=13, minute=0), Russian, "один час"),
+    (time(hour=13, minute=5), Russian, "пять минут второго"),
+    (time(hour=13, minute=15), Russian, "пятнадцать минут второго"),
+    (time(hour=13, minute=20), Russian, "двадцать минут второго"),
+    (time(hour=13, minute=30), Russian, "половина второго"),
+    (time(hour=13, minute=40), Russian, "без двадцати два"),
+    (time(hour=13, minute=45), Russian, "без пятнадцати два"),
+    (time(hour=13, minute=50), Russian, "без десяти два"),
+    (time(hour=13, minute=55), Russian, "без пяти два"),
+]
+
+
+@pytest.mark.parametrize("test_input, language, test_output", test_cases)
+def test_clocks(test_input, language, test_output):
+    clock = Watch(language=language)
+    assert test_output == clock(test_input)
+
+
+test_plural_cases = [
+    (time(hour=12, minute=17), Russian, "двенадцать семнадцать"),
+    (time(hour=12, minute=26), Russian, "двенадцать двадцать шесть"),
+    (time(hour=13, minute=1), Russian, "час ноль одна"),
+    (time(hour=13, minute=2), Russian, "час ноль две"),
+    (time(hour=13, minute=11), Russian, "час одиннадцать"),
+]
+
+
+@pytest.mark.parametrize("test_input, language, test_output", test_plural_cases)
+def test_cases(test_input, language, test_output):
+    clock = Watch(language=language)
+    assert test_output == clock(test_input)

tests/test_numbers/test_numbers_ru.py

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+import pytest
+from saa.core.numbers import Converter
+from saa.core.plugins import supported_languages
+
+Russian = supported_languages.get("ru")
+test_cases = [
+    (45, Russian, "сорок пять"),
+    (13, Russian, "тринадцать"),
+    (7, Russian, "семь"),
+]
+
+
+@pytest.mark.parametrize("test_input, language, test_output", test_cases)
+def test_numbers(test_input, language, test_output):
+    convert = Converter(language=language)
+    assert test_output == convert(test_input)