test: Add syntax checks for shell completions

misc/completion/ocrmypdf.bash

@@ -1,5 +1,7 @@
 # ocrmypdf completion                                     -*- shell-script -*-
 
+set -o errexit
+
 _ocrmypdf()
 {
     local cur prev cword words split
@@ -84,4 +86,6 @@ _ocrmypdf()
 } &&
 complete -F _ocrmypdf ocrmypdf
 
+set +o errexit
+
 # ex: filetype=sh

tests/test_completion.py

@@ -0,0 +1,48 @@
+# © 2019 James R. Barlow: github.com/jbarlow83
+#
+# This file is part of OCRmyPDF.
+#
+# OCRmyPDF is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# OCRmyPDF is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
+
+from subprocess import run, PIPE
+
+import pytest
+
+
+def test_fish():
+    try:
+        proc = run(
+            ['fish', '-n', 'misc/completion/ocrmypdf.fish'],
+            check=True,
+            encoding='utf-8',
+            stdout=PIPE,
+            stderr=PIPE,
+        )
+        assert proc.stderr == '', proc.stderr
+    except FileNotFoundError:
+        pytest.xfail('fish is not installed')
+
+
+def test_bash():
+    try:
+        proc = run(
+            ['bash', '-n', 'misc/completion/ocrmypdf.bash'],
+            check=True,
+            encoding='utf-8',
+            stdout=PIPE,
+            stderr=PIPE,
+        )
+        assert proc.stderr == '', proc.stderr
+    except FileNotFoundError:
+        pytest.xfail('bash is not installed')