Migrate the test suite to GitHub Actions

.github/workflows/build-test.yaml

@@ -0,0 +1,68 @@
+name: Build and Test
+
+on: [push, pull_request]
+
+defaults:
+  run:
+    shell: bash
+
+env: 
+  HOMEBREW_NO_AUTO_UPDATE: 1
+
+jobs:
+
+  build:
+    strategy:
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-18.04]
+        python-version: [3.8]
+        minimal: [false]
+        answer-tests: [false]
+        include:
+          - os: ubuntu-18.04
+            python-version: 3.6
+            minimal: true
+            answer-tests: false
+          - os: ubuntu-18.04
+            python-version: 3.7
+            minimal: false
+            answer-tests: true
+
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Install Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - uses: actions/checkout@v2
+      with:
+        submodules: recursive
+        fetch-depth: 0
+    - uses: s-weigand/setup-conda@v1
+      if: matrix.os == 'windows-latest'
+      with:
+        update-conda: true
+        conda-channels: conda-forge
+        activate-conda: true
+        python-version: ${{matrix.python-version}}
+    - name: Show env
+      shell: bash
+      run: |
+        echo PATH $PATH
+        echo python `which python`
+        python -c "import sys; print(sys.version)"
+    - name: Install dependencies and yt
+      shell: bash
+      run: |
+        if [ "${{ matrix.minimal }}" == "true" ]; then
+          export MINIMAL=1
+        fi
+        source ./tests/ci_install.sh
+    - name: Run Tests
+      run: |
+        if [ "${{ matrix.answer-tests }}" == "true" ]; then
+          export CONFIG=nose_answer.cfg
+        else
+          export CONFIG=nose_unit.cfg
+        fi
+        python -m nose -c $CONFIG --traverse-namespace

tests/travis_install.sh → tests/ci_install.sh

@@ -1,9 +1,33 @@
 set -x   # Show which command is being run
 
-echo "Travis build stage: $TRAVIS_BUILD_STAGE_NAME"
+[[ -n ${RUNNER_OS} ]] && export TRAVIS_OS_NAME=${RUNNER_OS}
+
+case ${RUNNER_OS} in
+linux|Linux)
+    sudo apt-get install \
+      libhdf5-serial-dev \
+      libnetcdf-dev \
+      libproj-dev \
+      proj-data \
+      proj-bin \
+      libgeos-dev \
+      libopenmpi-dev
+    ;;
+osx|macOS)
+    sudo mkdir -p /usr/local/man
+    sudo chown -R "${USER}:admin" /usr/local/man
+    HOMEBREW_NO_AUTO_UPDATE=1 brew install hdf5 proj geos open-mpi netcdf ccache
+    ;;
+esac
+
+mkdir -p $HOME/.config/yt
+echo "[yt]" > $HOME/.config/yt/ytrc
+echo "suppressStreamLogging = True" >> $HOME/.config/yt/ytrc
+cat $HOME/.config/yt/ytrc
+cp tests/matplotlibrc .
 
 # Step 1: pre-install required packages
-if [[ "$TRAVIS_OS_NAME" == "windows" ]] && [[ $MINIMAL != 1 ]]; then
+if [[ "${RUNNER_OS}" == "Windows" ]] && [[ $MINIMAL != 1 ]]; then
     # Install some dependencies using conda (if not doing a minimal run)
     CYTHON=$(grep cython tests/test_prerequirements.txt)
     NUMPY=$(grep numpy tests/test_prerequirements.txt)
@@ -12,13 +36,13 @@ if [[ "$TRAVIS_OS_NAME" == "windows" ]] && [[ $MINIMAL != 1 ]]; then
     H5PY=$(grep h5py tests/test_requirements.txt)
     MATPLOTLIB=$(grep matplotlib tests/test_requirements.txt)
     SCIPY=$(grep scipy tests/test_requirements.txt)
+    conda config --set always_yes yes
+    conda info -a
     conda install --yes -c conda-forge $CYTHON $NUMPY $CARTOPY $H5PY $MATPLOTLIB $SCIPY
 else
-    ccache -s
-    # Upgrade pip and setuptools and wheel to get clean install
-    $PIP install --upgrade pip
-    $PIP install --upgrade wheel
-    $PIP install --upgrade setuptools
+    python -m pip install --upgrade pip
+    python -m pip install --upgrade wheel
+    python -m pip install --upgrade setuptools
 fi
 
 # Step 2: install required packages (depending on whether the build is minimal)
@@ -27,19 +51,19 @@ if [[ $MINIMAL == 1 ]]; then
     # don't error out
     # The first numpy to support py3.6 is 1.12, but numpy 1.13 matches
     # unyt so we'll match it here.
-    $PIP install numpy==1.13.3 cython==0.26.1
-    $PIP install -r tests/test_minimal_requirements.txt
+    python -m pip install numpy==1.13.3 cython==0.26.1
+    python -m pip install -r tests/test_minimal_requirements.txt
 else
     # Getting cartopy installed requires getting cython and numpy installed
     # first; this is potentially going to be fixed with the inclusion of
     # pyproject.toml in cartopy.
     # These versions are pinned, so we will need to update/remove them when
     # the hack is no longer necessary.
-    $PIP install -r tests/test_prerequirements.txt
-    CFLAGS="$CFLAGS -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H" $PIP install -r tests/test_requirements.txt
+    python -m pip install -r tests/test_prerequirements.txt
+    CFLAGS="$CFLAGS -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H" python -m pip install -r tests/test_requirements.txt
 fi
 
 # Step 3: install yt
-$PIP install -e .
+python -m pip install -e .
 
-set +x  # Do not show which command is being run (Travis default)
+set +x  # Do not show which command is being run (Travis default)