Added helper script to run multiple tox environments

CONTRIBUTING.md

@@ -68,6 +68,11 @@ You can run `tox` with the following arguments:
 * `tox -e spellcheck` to run a spellcheck on all the code
 * `tox -e lint-some-package` to run lint checks on `some-package`
 
+There is a helper script `./scripts/runtox.sh` for running multiple tox environments in one command:
+
+- `./scripts/runtox.sh fastapi` will run all `tox` environments containing the string `"fastapi"` (useful to run one environment in all Python versions)
+- `./scripts/runtox.sh py312` will run all `tox` environments containing the string `"py312"` (useful to run all environments in one Python version)
+
 `black` and `isort` are executed when `tox -e lint` is run. The reported errors can be tedious to fix manually.
 An easier way to do so is:
 

scripts/runtox.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+#
+# Usage: 
+#   ./scripts/runtox.sh py312 <pytest-args>
+#
+# Runs all environments with substring "py312" and the given arguments for pytest
+# 
+
+# Print commands and exit on first error
+set -ex
+
+# Find the right tox executable
+if [ -n "$TOXPATH" ]; then
+    true
+elif which tox &> /dev/null; then
+    TOXPATH=tox
+else
+    TOXPATH=./.venv/bin/tox
+fi
+
+# Find the environments matching the searchstring
+searchstring="$1"
+ENV="$($TOXPATH -l | grep -- "$searchstring" | tr $'\n' ',')"
+
+if [ -z "${ENV}" ]; then
+    echo "No targets found. Skipping."
+    exit 0
+fi
+
+# Run tox with all matching environments
+exec $TOXPATH -e "$ENV" -- "${@:2}"