Add github workflow for tests

.github/workflows/run-tests.yml

@@ -0,0 +1,31 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+        sympy-version: ['1.12', '1.11', '1.10', '1.9', '1.8', '1.7', '1.6']
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Setup conda
+      uses: conda-incubator/setup-miniconda@v2
+      with:
+        auto-update-conda: true
+        miniconda-version: "latest"
+        mamba-version: "*"
+        channels: conda-forge
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      shell: bash -l {0}
+      run: mamba install sympy=${{ matrix.sympy-version }} pytest
+
+    - name: Test with pytest
+      shell: bash -l {0}
+      run: pytest -v --color=yes test

README.md

@@ -1,6 +1,6 @@
 # angcorrwat
 
-[![Build Status](https://travis-ci.com/op3/angcorrwat.svg?branch=master)](https://travis-ci.com/op3/angcorrwat)
+![Build Status](https://github.com/op3/angcorrwat/actions/workflows/run-tests.yml/badge.svg)
 [![License](https://img.shields.io/badge/License-GPL%20v3+-blue.svg)](LICENSE)
 [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/op3/angcorrwat/master?filepath=doc%2Ftutorial.ipynb)