restore function subtract; fixed #1

.github/workflows/python-app.yml

@@ -0,0 +1,40 @@
+# This workflow will install Python dependencies, run tests and lint with a single version of Python
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python application
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: "3.10"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 pytest pytest-cov
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Lint with flake8
+      run: |
+        pytest --cov-report "xml:coverage.xml" --cov=.
+    - name: Create Coverage
+      if: ${{ github.event_name == 'pull_request' }}
+      uses: orgoro/coverage@v3
+      with:
+          coverageFile: coverage.xml
+          token: ${{ secrets.GITHUB_TOKEN }}

functions.py

@@ -3,7 +3,7 @@ def add(a, b):
 
 
 def subtract(a, b):
-    return a + b
+    return a - b
 
 
 def multiply(a, b):

test_functions.py

@@ -8,8 +8,11 @@ def test_add():
     assert add("space", "ship") == "spaceship"
 
 
-# def test_subtract():
-#    assert subtract(3,2) == 1
+def test_subtract():
+   assert subtract(3,2) == 1
+
+def test_multiply():
+    assert multiply(2,3) == 6
 
 
 # def test_convert_fahrenheit_to_celsius():