add coverage to action

Author: cleoold

.coveragerc

@@ -0,0 +1,10 @@
+[run]
+branch = true
+source = types_linq
+omit = types_linq/more_typing.py
+
+[report]
+exclude_lines =
+    pragma: no cover
+    if TYPE_CHECKING:
+fail_under = 100

.github/workflows/pytest.yml

@@ -33,3 +33,25 @@ jobs:
     - name: Test with pytest
       run: |
         pytest
+
+  coverage:
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest coverage
+    - name: Install project
+      run: |
+        pip install .
+    - name: Coverage report
+      run: |
+        coverage run -m pytest
+        coverage report -m

README.md

@@ -1,6 +1,6 @@
 # types-linq
 
-![Python](https://img.shields.io/badge/python-3.7%2B-blue.svg) [![pypi](https://img.shields.io/pypi/v/types-linq)](https://pypi.org/project/types-linq/) [![pytest](https://github.com/cleoold/types-linq/workflows/pytest/badge.svg)](https://github.com/cleoold/types-linq/actions)
+![Python](https://img.shields.io/badge/python-3.7%2B-blue.svg) [![pypi](https://img.shields.io/pypi/v/types-linq)](https://pypi.org/project/types-linq/) [![pytest](https://github.com/cleoold/types-linq/workflows/pytest/badge.svg)](https://github.com/cleoold/types-linq/actions?query=workflow%3Apytest)
 
 This is an attempt to implement linq methods seen in .NET ([link](https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable?view=net-5.0)). Currently WIP.