[Docs] Enable coverage badge. (#48)

Enable coverage badge in README.

.github/workflows/test.yml

@@ -36,12 +36,11 @@ jobs:
     - name: Run tests
       run: |
         hatch -v run test
-    - name: Upload coverage data
-      uses: actions/upload-artifact@v4
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v5
       with:
-        name: "coverage-data-${{ matrix.python-version }}"
-        path: .coverage
-        if-no-files-found: ignore
+        token: ${{ secrets.CODECOV_TOKEN }}
+        slug: pasqal-io/qadence2-expressions
 
   publish:
     name: Publish to PyPI

README.md

@@ -8,6 +8,8 @@
 
 Qadence 2 Expressions consisting of symbolic expressions and blocks, i.e. quantum digital, analog, digital-analog and composite gates, together with their logic and engine.
 
+![Coverage](https://img.shields.io/codecov/c/github/pasqal-io/qadence2-expressions?style=flat-square)
+
 ## Installation
 
 !!! note

pyproject.toml

@@ -67,11 +67,11 @@ dependencies = [
 ]
 
 [tool.hatch.envs.default.scripts]
-test = "pytest -n auto --cov-config=pyproject.toml --cov=qadence2_expressions {args}"
+test = "pytest -n auto --cov-report=xml --cov-config=pyproject.toml --cov=qadence2_expressions --cov=tests {args}"
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
-addopts = """-vvv --cov-config=pyproject.toml --cov=qadence2_expressions"""
+addopts = """-vvv"""
 xfail_strict = true
 filterwarnings = [
   "ignore:Call to deprecated create function FieldDescriptor",