Added github actions CI workflow with unit tests

.github/workflows/main.yml

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+name: CI
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+
+jobs:
+  tests:
+    name: Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version:
+        - '3.7'
+        - '3.8'
+        - '3.9'
+        - '3.10'
+        - '3.11'
+        - '3.12'
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Run Tests
+      run: |
+        pip install pytest pytest-cov
+        pytest --cov
+

tests/test_detector.py

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+import pytest
+
+from pytrovich.detector import PetrovichGenderDetector
+from pytrovich.enums import Gender
+
+
+@pytest.fixture(scope='session')
+def gender_detector():
+    return PetrovichGenderDetector()
+
+
+class TestPetrovichGenderDetector:
+    @pytest.mark.parametrize('middlename,expected_gender', (
+        ('Иванович', Gender.MALE),
+        ('Ильинична', Gender.FEMALE),
+        pytest.param('Блаблабла', Gender.ANDROGYNOUS, marks=pytest.mark.xfail(reason='Issue #6')),
+    ))
+    def test_detect_by_middlename(self, gender_detector, middlename, expected_gender):
+        assert gender_detector.detect(middlename=middlename) == expected_gender

tests/test_maker.py

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+import pytest
+
+from pytrovich.enums import Case, NamePart, Gender
+from pytrovich.maker import PetrovichDeclinationMaker
+
+
+@pytest.fixture(scope='session')
+def maker() -> PetrovichDeclinationMaker:
+    return PetrovichDeclinationMaker()
+
+
+class TestPetrovichDeclinationMaker:
+    @pytest.mark.parametrize('name_part,gender,case_to_use,original_name,expected_result', (
+        # firstnames
+        (NamePart.FIRSTNAME, Gender.FEMALE, Case.GENITIVE, 'Мария', 'Марии'),
+        (NamePart.FIRSTNAME, Gender.MALE, Case.DATIVE, 'Василий', 'Василию'),
+        (NamePart.FIRSTNAME, Gender.FEMALE, Case.ACCUSATIVE, 'Ксюша', 'Ксюшу'),
+        (NamePart.FIRSTNAME, Gender.MALE, Case.INSTRUMENTAL, 'Паша', 'Пашой'),
+        (NamePart.FIRSTNAME, Gender.FEMALE, Case.PREPOSITIONAL, 'Елена', 'Елене'),
+        # middlenames
+        (NamePart.MIDDLENAME, Gender.FEMALE, Case.GENITIVE, 'Геннадиевна', 'Геннадиевны'),
+        (NamePart.MIDDLENAME, Gender.MALE, Case.DATIVE, 'Васильевич', 'Васильевичу'),
+        (NamePart.MIDDLENAME, Gender.FEMALE, Case.ACCUSATIVE, 'Васильевна', 'Васильевну'),
+        (NamePart.MIDDLENAME, Gender.MALE, Case.INSTRUMENTAL, 'Павлович', 'Павловичем'),
+        (NamePart.MIDDLENAME, Gender.FEMALE, Case.PREPOSITIONAL, 'Павловна', 'Павловне'),
+        # lastnames
+        (NamePart.LASTNAME, Gender.FEMALE, Case.GENITIVE, 'Цветаева', 'Цветаевой'),
+        (NamePart.LASTNAME, Gender.MALE, Case.DATIVE, 'Толстой', 'Толстому'),
+        (NamePart.LASTNAME, Gender.FEMALE, Case.ACCUSATIVE, 'Ахматова', 'Ахматову'),
+        (NamePart.LASTNAME, Gender.MALE, Case.INSTRUMENTAL, 'Лермонтов', 'Лермонтовым'),
+        (NamePart.LASTNAME, Gender.FEMALE, Case.PREPOSITIONAL, 'Баркова', 'Барковой'),
+    ))
+    def test_common_names(
+        self,
+        maker: PetrovichDeclinationMaker,
+        name_part: NamePart,
+        gender: Gender,
+        case_to_use: Case,
+        original_name: str,
+        expected_result: str
+    ) -> None:
+
+        assert maker.make(name_part, gender, case_to_use, original_name) == expected_result
+