CI: Add Travis config

Author: effigies

.travis.yml

@@ -0,0 +1,42 @@
+# vim ft=yaml
+os: linux
+dist: xenial
+
+language: python
+cache: pip
+
+python:
+  - 3.5
+  - 3.6
+  - 3.7
+  - 3.8
+
+env:
+  global:
+    - CHECK_TYPE="tests"
+    - INSTALL_DEPENDS="pip setuptools"
+    - DEPENDS="-r min-requirements.txt"
+
+before_install:
+  - python -m pip install --upgrade pip virtualenv
+  - virtualenv --python=python /tmp/venv
+  - source /tmp/venv/bin/activate
+  - python --version
+  - python -m pip --version
+  - python -m pip install --upgrade $INSTALL_DEPENDS
+  - python -m pip --version
+
+install:
+  - if [ -n "$DEPENDS" ]; then python -m pip install $DEPENDS; fi
+  - python -m pip install .
+  - python -c "import sdcflows; print(sdcflows.__version__)"
+
+before_script:
+  - travis_retry python -m pip install "sdcflows[$CHECK_TYPE]"
+
+script:
+  - pytest -n 2 -v --cov sdcflows --cov-report xml:cov.xml --doctest-modules sdcflows
+
+after_script:
+  - python -m pip install codecov
+  - python -m codecov --flags travis --file cov.xml -e $TRAVIS_JOB_NUMBER