diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a0d05a6..e83c732 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,30 +1,22 @@
-# .github/workflows/test.yml
-name: Python Tests
-
-on:
-  push:
-    branches: [ main, master ]
-  pull_request:
-    branches: [ main, master ]
-
+name: Tests
+on: push
 jobs:
-  test:
+  build:
     runs-on: ubuntu-latest
-    
     steps:
-    - name: Checkout code
-      uses: actions/checkout@v4
-      
-    - name: Set up Python
-      uses: actions/setup-python@v4
-      with:
-        python-version: '3.13'
-        
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install -r requirements.txt
-        pip install pytest
-        
-    - name: Run tests
-      run: pytest -v
\ No newline at end of file
+      - uses: actions/checkout@v4
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13.3"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff
+          pip install pytest
+      - name: Run Ruff
+        run: |
+          ruff check --output-format=github
+      - name: Run unit-tests
+        run: |
+          python -m pytest test/*
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..456fd8e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,177 @@
+# Created by https://www.toptal.com/developers/gitignore/api/python
+# Edit at https://www.toptal.com/developers/gitignore?templates=python
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/s
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+# End of https://www.toptal.com/developers/gitignore/api/python
diff --git a/src/.gitignore b/src/.gitignore
index ad4a1f1..456fd8e 100644
--- a/src/.gitignore
+++ b/src/.gitignore
@@ -12,6 +12,7 @@ __pycache__/
 
 # Distribution / packaging
 .Python
+build/s
 build/
 develop-eggs/
 dist/
diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/conftest.py b/src/conftest.py
new file mode 100644
index 0000000..b0726d1
--- /dev/null
+++ b/src/conftest.py
@@ -0,0 +1,7 @@
+import pytest
+import random
+
+@pytest.fixture
+def rndm():
+    rndm_array = [random.randint(-100, 100) for i in range(10)]
+    return rndm_array
\ No newline at end of file
diff --git a/src/pyramid_sort_alg.py b/src/pyramid_sort_alg.py
new file mode 100644
index 0000000..960d677
--- /dev/null
+++ b/src/pyramid_sort_alg.py
@@ -0,0 +1,28 @@
+def build_subroot(arr, ln, i_root):
+    main_root = i_root
+
+    left_root = 2 * i_root + 1
+    right_root = 2 * i_root + 2
+
+    if left_root < ln and arr[left_root] > arr[main_root]:
+        main_root = left_root
+
+    if right_root < ln and arr[right_root] > arr[main_root]:
+        main_root = right_root
+
+    if main_root != i_root:
+        arr[i_root], arr[main_root] = arr[main_root], arr[i_root]
+        build_subroot(arr, ln, main_root)
+
+
+def build_pyramid(arr):
+    ln = len(arr)
+
+    for i in range(ln // 2 - 1, -1, -1):  # index main_root
+        build_subroot(arr, ln, i)
+
+    for d in range(ln - 1, 0, -1):  # decline lenght
+        arr[d], arr[0] = arr[0], arr[d]
+        build_subroot(arr, d, 0)
+
+    return arr
diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/test/conftest.py b/test/conftest.py
new file mode 100644
index 0000000..b0726d1
--- /dev/null
+++ b/test/conftest.py
@@ -0,0 +1,7 @@
+import pytest
+import random
+
+@pytest.fixture
+def rndm():
+    rndm_array = [random.randint(-100, 100) for i in range(10)]
+    return rndm_array
\ No newline at end of file
diff --git a/test/pyramid_sort_test.py b/test/pyramid_sort_test.py
new file mode 100644
index 0000000..2fd55d6
--- /dev/null
+++ b/test/pyramid_sort_test.py
@@ -0,0 +1,37 @@
+from src.pyramid_sort_alg import build_pyramid
+from src.conftest import rndm  # noqa F401
+import pytest
+
+
+# обычные unit-тесты
+
+test_array = [0, 9, 3, 5]
+
+
+def test_first():
+    assert build_pyramid(test_array) == [0, 3, 5, 9]
+
+
+second_array = [766, 1, 9023, 63, 4248]
+
+
+def test_second():
+    assert build_pyramid(second_array) != [9023, 1, 766, 4248, 63]
+
+
+# крайние случаи
+
+
+@pytest.mark.parametrize(
+    ["array", "expected"],
+    [([], []), ([0], [0]), ([-1, 2, -3], [-3, -1, 2]), ([1, 2, 1], [1, 1, 2])],
+)
+def test_with_expected(array, expected):
+    assert build_pyramid(array) == expected
+
+
+# property-based
+
+
+def test_random_array(rndm):  # noqa F811
+    assert build_pyramid(rndm) == sorted(rndm)