CI: Parameterize CrateDB version for integration tests

.github/workflows/main.yml

@@ -4,12 +4,17 @@ on: push
 
 jobs:
   test:
-    name: Test python-${{ matrix.python-version }} on ${{ matrix.os }}
+    name: Python ${{ matrix.python-version }}, CrateDB ${{ matrix.cratedb-version }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-2019]
         python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
+        cratedb-version: ['4.7.1']
+    env:
+      OS: ${{ matrix.os }}
+      PYTHON: ${{ matrix.python-version }}
+      CRATEDB_VERSION: ${{ matrix.cratedb-version }}
 
     steps:
       - uses: actions/checkout@v2

DEVELOP.rst

@@ -19,10 +19,14 @@ Afterwards you can launch crash::
 Running Tests
 =============
 
-The tests are run using the `unittest`_::
+The tests are run using the `unittest`_ module::
 
     $ venv/bin/python -m unittest -v
 
+In order to adjust the CrateDB version used for running the tests, amend the
+environment variable ``CRATEDB_VERSION`` like::
+
+    $ export CRATEDB_VERSION=4.8.0
 
 If you install tox_, you can also run tests against multiple Python interpreters::
 

tests/test_integration.py

@@ -27,6 +27,7 @@
 if sys.platform != "linux":
     raise SkipTest("Integration tests only supported on Linux")
 
+crate_version = os.getenv("CRATEDB_VERSION", "4.7.1")
 crate_http_port = 44209
 crate_transport_port = 44309
 crate_settings = {
@@ -38,7 +39,7 @@
     'transport.tcp.port': crate_transport_port
 }
 node = CrateLayer.from_uri(
-    'https://cdn.crate.io/downloads/releases/crate-4.7.1.tar.gz',
+    f'https://cdn.crate.io/downloads/releases/crate-{crate_version}.tar.gz',
     'crate',
     settings=crate_settings
 )