add e2e fish test

scripts/run-full-tests

@@ -10,7 +10,7 @@
 
 set -e
 
-if [ -z "$TEST_CONTAINER" ] ; then
+if [ -z "$TEST_CONTAINER" ]; then
     echo "This script is designed to work inside a test container and is not intended to"
     echo "be run manually. If you're trying to run borgmatic's end-to-end tests, execute"
     echo "scripts/run-end-to-end-dev-tests instead."
@@ -18,14 +18,14 @@ if [ -z "$TEST_CONTAINER" ] ; then
 fi
 
 apk add --no-cache python3 py3-pip borgbackup postgresql-client mariadb-client mongodb-tools \
-    py3-ruamel.yaml py3-ruamel.yaml.clib bash sqlite
+    py3-ruamel.yaml py3-ruamel.yaml.clib bash sqlite fish
 # If certain dependencies of black are available in this version of Alpine, install them.
 apk add --no-cache py3-typed-ast py3-regex || true
 python3 -m pip install --no-cache --upgrade pip==22.2.2 setuptools==64.0.1
 pip3 install --ignore-installed tox==3.25.1
 export COVERAGE_FILE=/tmp/.coverage
 
-if [ "$1" != "--end-to-end-only" ] ; then
+if [ "$1" != "--end-to-end-only" ]; then
     tox --workdir /tmp/.tox --sitepackages
 fi
 

tests/end-to-end/test_completion.py

@@ -3,3 +3,7 @@ import subprocess
 
 def test_bash_completion_runs_without_error():
     subprocess.check_call('borgmatic --bash-completion | bash', shell=True)
+
+
+def test_fish_completion_runs_without_error():
+    subprocess.check_call('borgmatic --fish-completion | fish', shell=True)