TST: Add test coverage

.github/workflows/test.yml

@@ -47,7 +47,9 @@ jobs:
           cache: "pip"
           cache-dependency-path: "pyproject.toml"
       - run: pip install -c .github/test-constraints.txt '.[test]'
-      - run: pytest
+      - run: pytest --cov --cov-report=lcov
+      - name: Coverage
+        uses: coverallsapp/github-action@v2
   build:
     name: Build
     runs-on: ubuntu-latest

.gitignore

@@ -1,4 +1,6 @@
 __pycache__
 _version.py
 .*.swp
+.coverage*
 .envrc
+*.lcov

README.md

@@ -1,3 +1,5 @@
 # _Heracles_ — Harmonic-space statistics on the sphere
 
+[![Coverage Status](https://coveralls.io/repos/github/heracles-ec/heracles/badge.svg?branch=main)](https://coveralls.io/github/heracles-ec/heracles?branch=main)
+
 The _Heracles_ code was developed in the _Euclid_ Science Ground Segment.

pyproject.toml

@@ -37,6 +37,7 @@ optional-dependencies = {docs = [
     "sphinxcontrib-katex",
 ], test = [
     "pytest",
+    "pytest-cov",
     "pytest-rerunfailures",
 ]}
 readme = "README.md"
@@ -52,6 +53,12 @@ force-exclude = """
 )
 """
 
+[tool.coverage]
+report = {skip_covered = true, sort = "cover"}
+run = {branch = true, parallel = true, source = [
+    "heracles",
+]}
+
 [tool.hatch]
 build.hooks.vcs.version-file = "heracles/_version.py"
 version.source = "vcs"