Continuous integration workflow with GitHub's 'actions' (#51)

* Continuous integration workflow with GitHub's 'actions'

* Download and cache OceansDB data

OceansDB is used for topography and climatology checks. These can be
relatively large files. Use a cache to run tests.

* Running pytest

* fix: _curvature_numpy() is now curvature()

.github/workflows/ci.yml

@@ -0,0 +1,83 @@
+name: CoTeDe
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 pytest
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install -e .
+
+    - name: Cache ETOPO
+      id: cache-etopo
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.config/oceansdb/etopo5.nc
+        key: ${{ runner.os }}-ETOPO
+
+    - name: Download ETOPO database
+      if: steps.cache-etopo.outputs.cache-hit != 'true'
+      run: python -c "import oceansdb; oceansdb.ETOPO()['topography']"
+
+    - name: Cache WOA
+      id: cache-woa
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.config/oceansdb/woa18_decav_t13_5d.nc
+          ~/.config/oceansdb/woa18_decav_t14_5d.nc
+          ~/.config/oceansdb/woa18_decav_t15_5d.nc
+          ~/.config/oceansdb/woa18_decav_t16_5d.nc
+          ~/.config/oceansdb/woa18_decav_s13_5d.nc
+          ~/.config/oceansdb/woa18_decav_s14_5d.nc
+          ~/.config/oceansdb/woa18_decav_s15_5d.nc
+          ~/.config/oceansdb/woa18_decav_s16_5d.nc
+        key: ${{ runner.os }}-WOA
+
+    - name: Download WOA database
+      if: steps.cache-woa.outputs.cache-hit != 'true'
+      run: |
+        python -c "import oceansdb; oceansdb.WOA()['sea_water_temperature']"
+        python -c "import oceansdb; oceansdb.WOA()['sea_water_salinity']"
+
+    - name: Cache CARS
+      id: cache-cars
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.config/oceansdb/temperature_cars2009a.nc
+          ~/.config/oceansdb/salinity_cars2009a.nc
+        key: ${{ runner.os }}-CARS
+
+    - name: Download CARS database
+      if: steps.cache-cars.outputs.cache-hit != 'true'
+      run: |
+        python -c "import oceansdb; oceansdb.CARS()['sea_water_temperature']"
+        python -c "import oceansdb; oceansdb.CARS()['sea_water_salinity']"
+
+    - name: Test with pytest
+      run: |
+        pytest tests

cotede/qctests/gradient.py

@@ -42,7 +42,7 @@ def _curvature_pandas(x):
         x = x.data
 
     if not PANDAS_AVAILABLE:
-        return _curvature_numpy(x)
+        return curvature(x)
 
     if hasattr(x, "to_series"):
         x = x.to_series()