diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000000..06ce829ff9
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,42 @@
+name: Starts unittests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+    
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+          
+      - name: Add PYTHONPATH
+        run: echo "PYTHONPATH=$(pwd)" >> $GITHUB_ENV
+
+      - name: Install pytest
+        run: pip install pytest
+
+      - name: Run tests ubuntu
+        shell: bash
+        run: |
+          export PYTHONPATH="${{ github.workspace }}"
+          pytest
+
+      - name: Run tests windows
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $env:PYTHONPATH = "${{ github.workspace }}"
+          pytest
diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1 @@
+
diff --git a/circle.py b/circle.py
index c3eb8647c9..706ee9b0ac 100644
--- a/circle.py
+++ b/circle.py
@@ -1,10 +1,10 @@
 import math
 
 
-def area(r):
+def area_circle(r):
     return math.pi * r * r
 
 
-def perimeter(r):
+def perimeter_circle(r):
     return 2 * math.pi * r
 
diff --git a/rectangle.py b/rectangle.py
new file mode 100644
index 0000000000..3ccdb5126a
--- /dev/null
+++ b/rectangle.py
@@ -0,0 +1,15 @@
+
+def area_rectangle(a, b):
+    if a >= 0 and b >= 0:
+        return a * b
+    return -1
+
+
+def perimeter_rectangle(a, b, c, d):
+    if a != 0 and b != 0 and c != 0 and d != 0:
+        if (a == b and c == d) or (a == c and b == d) or (a == d and b == c):
+            return a + b + c + d
+        else:
+            return -1
+    else:
+        return 0
diff --git a/square.py b/square.py
index 0f98724205..fffcf1f556 100644
--- a/square.py
+++ b/square.py
@@ -1,7 +1,7 @@
 
-def area(a):
+def area_square(a):
     return a * a
 
 
-def perimeter(a):
+def perimeter_square(a):
     return 4 * a
diff --git a/test_results.py b/test_results.py
new file mode 100644
index 0000000000..5c93e88559
--- /dev/null
+++ b/test_results.py
@@ -0,0 +1,166 @@
+import unittest
+from math import isclose
+
+from .rectangle import area_rectangle, perimeter_rectangle
+class RectangleTestCase(unittest.TestCase):
+
+    def test_correct(self):
+        test_area_data = [
+            (2, 5, 10),
+            (15, 2, 30),
+            (6, 5, 30),
+            (6, 60, 360)
+        ]
+        for width, height, expect in test_area_data:
+            with self.subTest(width=width, height=height):
+                self.assertEqual(area_rectangle(width, height), expect)
+
+        test_perim_data = [
+            (2, 2, 5, 5, 14),
+            (2, 5, 2, 5, 14),
+            (2, 5, 5, 2, 14),
+            (2, 5, 2, 5, 14)
+        ]
+        for param_1, param_2, param_3, param_4, expect in test_perim_data:
+            with self.subTest(param_1=param_1, param_2=param_2, param_3=param_3, param_4=param_4):
+                self.assertEqual(perimeter_rectangle(param_1, param_2, param_3, param_4), expect)
+
+    def test_accuracy_results(self):
+        test_area_data = [
+            (2.852, 5.432,15.492064),
+            (15.345678980, 2.45784930,37.71736633901771),
+            (6.000000004, 5.4387,32.6322000217548),
+            (6.009, 6.991, 42.008919)
+        ]
+        for width, height, expect in test_area_data:
+            with self.subTest(width=width, height=height):
+                res = area_rectangle(width, height)
+                self.assertTrue(isclose(res, expect))
+
+        test_perim_data = [
+            (15.492064, 5.4387, 15.492064, 5.4387, 41.861528),
+            (6.000000004, 6.000000004, 6.000000004, 6.000000004, 24.000000016),
+            (6.009, 6.009, 6.991, 6.991, 26),
+            (42.008919, 37.71736633901771, 37.71736633901771, 42.008919, 159.45257067803542)
+        ]
+        for param_1, param_2, param_3, param_4, expect in test_perim_data:
+            with self.subTest(param_1=param_1, param_2=param_2, param_3=param_3, param_4=param_4):
+                res = perimeter_rectangle(param_1, param_2, param_3, param_4)
+                self.assertTrue(isclose(res, expect))
+    
+from circle import area_circle, perimeter_circle
+class CircleTestCase(unittest.TestCase):
+    
+    def test_correct(self):
+        test_area_data = [
+            (5, 78.539816339744831),
+            (134, 56410.43768785832739),
+            (56, 9852.034561657591596),
+            (2, 12.566370614359173)
+        ]
+        for radius, expect in test_area_data:
+            with self.subTest(radius=radius):
+                res = area_circle(radius)
+                self.assertTrue(isclose(res, expect))
+
+        test_perim_data = [
+            (5, 31.415926535897932),
+            (134, 841.946831162064588),
+            (56, 351.858377202056843),
+            (2, 12.566370614359173)
+        ]
+        for radius, expect in test_perim_data:
+            with self.subTest(radius=radius):
+                res = perimeter_circle(radius)
+                self.assertTrue(isclose(res, expect))
+
+from square import area_square, perimeter_square
+class SquareTestCase(unittest.TestCase):
+    def test_correct(self):
+        test_area_data = [
+            (5, 25),
+            (134, 17956),
+            (56, 3136),
+            (2, 4)
+        ]
+        for side, expect in test_area_data:
+            with self.subTest(side=side):
+                self.assertEqual(expect, area_square(side))
+
+        test_perim_data = [
+            (5, 20),
+            (134, 536),
+            (56, 224),
+            (2, 8)
+        ]
+        for side, expect in test_perim_data:
+            with self.subTest(side=side):
+                self.assertEqual(expect, perimeter_square(side))
+
+    def test_accuracy_results(self):
+        test_area_data = [
+            (37.71736633901771, 1422.599723551666212),
+            (159.45257067803542, 25425.122295833874622),
+            (32.6322000217548, 1064.86047825981397),
+            (42.008919, 1764.749275548561)
+        ]
+        for side, expect in test_area_data:
+            with self.subTest(side=side):
+                self.assertTrue(isclose(expect, area_square(side)))
+
+        test_perim_data = [
+            (37.71736633901771, 150.86946535607084),
+            (159.45257067803542, 637.8102827121416),
+            (32.6322000217548, 130.5288000870192),
+            (42.008919, 168.035676)
+        ]
+        for side, expect in test_perim_data:
+            with self.subTest(side=side):
+                self.assertTrue(isclose(expect, perimeter_square(side)))
+
+
+from triangle import area_triangle, perimeter_triangle
+class TriangleTestCase(unittest.TestCase):
+
+    def test_correct(self):
+        test_area_data = [
+            (4, 5, 10),
+            (30, 2, 30),
+            (6, 8, 24),
+            (10, 7, 35)
+        ]
+        for osn, height, expect in test_area_data:
+            with self.subTest(osn=osn, height=height):
+                self.assertEqual(area_triangle(osn, height), expect)
+
+        test_perim_data = [
+            (2, 8, 6, 16),
+            (4, 5, 6, 15),
+            (19, 4, 20, 43),
+            (8, 18, 23, 49)
+        ]
+        for param_1, param_2, param_3, expect in test_perim_data:
+            with self.subTest(param_1=param_1, param_2=param_2, param_3=param_3):
+                self.assertEqual(perimeter_triangle(param_1, param_2, param_3), expect)
+
+    def test_accuracy_results(self):
+        test_area_data = [
+            (2.852, 5.432, 7.746032),
+            (15.345678980, 2.45784930, 18.858683169508855),
+            (6.000000004, 5.4387, 16.3161000108774),
+            (6.009, 6.991, 21.0044595)
+        ]
+        for osn, height, expect in test_area_data:
+            with self.subTest(osn=osn, height=height):
+                res = area_triangle(osn, height)
+                self.assertTrue(isclose(res, expect))
+
+        test_perim_data = [
+            (15.492064, 5.4387, 11.492064, 32.422828),
+            (6.000000004, 3.000000004, 5.000000004, 14.000000012),
+            (42.008919, 37.71736633901771, 32.008919, 111.73520433901771)
+        ]
+        for param_1, param_2, param_3, expect in test_perim_data:
+            with self.subTest(param_1=param_1, param_2=param_2, param_3=param_3):
+                res = perimeter_triangle(param_1, param_2, param_3)
+                self.assertTrue(isclose(res, expect))
diff --git a/triangle.py b/triangle.py
new file mode 100644
index 0000000000..2a3bb7972e
--- /dev/null
+++ b/triangle.py
@@ -0,0 +1,5 @@
+def area_triangle(a, h):
+    return a * h / 2
+
+def perimeter_triangle(a, b, c):
+    return a + b + c