patch 9.0.1257: code style is not check in test scripts
Problem: Code style is not check in test scripts.
Solution: Add basic code style check for test files.
diff --git a/src/testdir/unix.vim b/src/testdir/unix.vim
index b82c63c..366c9b1 100644
--- a/src/testdir/unix.vim
+++ b/src/testdir/unix.vim
@@ -2,7 +2,7 @@
" Always use "sh", don't use the value of "$SHELL".
set shell=sh
-" Only when the +eval feature is present.
+" Only when the +eval feature is present.
if 1
" While some tests overwrite $HOME to prevent them from polluting user files,
" we need to remember the original value so that we can tell external systems