diff --git a/.github/workflows/tests.yml b/.github/workflows/run_tests.yml
similarity index 54%
rename from .github/workflows/tests.yml
rename to .github/workflows/run_tests.yml
index 80d1c70..d278f25 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/run_tests.yml
@@ -2,32 +2,38 @@ name: Tests
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [develop]
   pull_request:
-    branches: [ "main" ]
+    branches: [main, develop]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
     strategy:
-      max-parallel: 4
+      max-parallel: 6
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11"]
-
+        python-version: ['3.10', '3.11']
+        platform: [ubuntu-latest, macos-latest, windows-latest]
     steps:
     - uses: actions/checkout@v4
+      with:
+          fetch-depth: 0
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
-        
+        cache: pip
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install .[dev]
-        
+
     - name: Test with pytest
-      run: |
-        pytest --cov=tofea
+      run: pytest --cov tofea
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 8582a0a..d2af458 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # TOFEA
 
+[![Tests](https://github.com/yaugenst/tofea/actions/workflows/run_tests.yml/badge.svg)](https://github.com/yaugenst/tofea/actions/workflows/run_tests.yml)
+[![codecov](https://codecov.io/gh/yaugenst/tofea/graph/badge.svg?token=5Z2SYQ3CPM)](https://codecov.io/gh/yaugenst/tofea)
+
 Simple [autograd](https://github.com/HIPS/autograd)-differentiable finite element analysis for heat conductivity and compliance problems.
 
 ## Installation
diff --git a/pyproject.toml b/pyproject.toml
index cccec7f..15e9597 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,3 +37,6 @@ target-version = "py310"
 mypy_strict = true
 python_version = "3.10"
 ignore_missing_imports = true
+
+[tool.pytest.ini_options]
+filterwarnings = ["ignore::DeprecationWarning"]
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29