Continues processing JSONs even if hook fails (fixes #1038)

tests/pretty_format_json_test.py

@@ -82,6 +82,24 @@ def test_autofix_main(tmpdir):
     assert ret == 0
 
 
+def test_invalid_main(tmpdir):
+    srcfile1 = tmpdir.join('not_valid_json.json')
+    srcfile1.write(
+        '{\n'
+        '  // not json\n'
+        '  "a": "b"\n'
+        '}',
+    )
+    srcfile2 = tmpdir.join('to_be_json_formatted.json')
+    srcfile2.write('{ "a": "b" }')
+
+    # it should have skipped the first file and formatted the second one
+    assert main(['--autofix', str(srcfile1), str(srcfile2)]) == 1
+
+    # confirm second file was formatted (shouldn't trigger linter again)
+    assert main([str(srcfile2)]) == 0
+
+
 def test_orderfile_get_pretty_format():
     ret = main((
         '--top-keys=alist', get_resource_path('pretty_formatted_json.json'),