Test with several Vim and Neovim versions and fixed deps

Run tests on GitHub Actions with Vim 8.2.0000, the latest Vim, Neovim
0.9.5 and the latest Neovim by rhysd/action-setup-vim. test/run.sh only
uses the editors in $VUE_TEST_EDITORS if set, and fails if none runs.

Clone the syntax plugins for tests at fixed commits, so changes there
don't break tests unexpectedly.

test/run.sh

@@ -1,17 +1,27 @@
 #!/bin/sh
 # Run all test cases, or the ones given as arguments, with vim and nvim if
-# they are installed. Vim runs in a pseudo terminal by `script`, as syntax
-# in Ex mode (-es) isn't the same as in a terminal.
+# they are installed, or only the ones in $VUE_TEST_EDITORS. Vim runs in a
+# pseudo terminal by `script`, as syntax in Ex mode (-es) isn't the same as
+# in a terminal.
 #   ./test/run.sh
 #   ./test/run.sh basic template
+#   VUE_TEST_EDITORS=nvim ./test/run.sh
 cd "$(dirname "$0")/.." || exit 1
+editors=${VUE_TEST_EDITORS:-vim nvim}
 
-# Syntax plugins used by test/cases/example.vue
+# Syntax plugins used by test/cases/example.vue, at fixed commits
 mkdir -p test/deps
-for repo in digitaltoad/vim-pug kchmck/vim-coffee-script \
-  leafgarland/typescript-vim iloginow/vim-stylus; do
+for dep in digitaltoad/vim-pug@ea39cd942cf3194230cf72bfb838901a5344d3b3 \
+    kchmck/vim-coffee-script@28421258a8dde5a50deafbfc19cd9873cacfaa79 \
+    leafgarland/typescript-vim@4740441db1e070ef8366c888c658000dd032e4cb \
+    iloginow/vim-stylus@0e457b09db55d3518703bb22e1555872c5c44b7a; do
+  repo=${dep%@*}
+  commit=${dep#*@}
   dir=test/deps/${repo#*/}
-  [ -d "$dir" ] || git clone -q --depth 1 "https://github.com/$repo" "$dir"
+  [ -d "$dir" ] && continue
+  git init -q "$dir" &&
+    git -C "$dir" fetch -q --depth 1 "https://github.com/$repo" "$commit" &&
+    git -C "$dir" checkout -q FETCH_HEAD || exit 1
 done
 
 if [ $# -gt 0 ]; then
@@ -20,17 +30,24 @@ else
   cases=$(ls test/cases/*.vue test/cases/*.wpy 2>/dev/null | sed 's#.*/##; s#\.[a-z]*$##')
 fi
 
+has_editor() {
+  case " $editors " in
+    *" $1 "*) command -v "$1" >/dev/null ;;
+    *) return 1 ;;
+  esac
+}
+
 out=$(mktemp)
 status=0
 expected=0
 for name in $cases; do
-  if command -v vim >/dev/null; then
+  if has_editor vim; then
     expected=$((expected + 1))
     VUE_TEST_CASE=$name VUE_TEST_OUT=$out timeout 60 script -qec \
       'stty rows 40 cols 120; vim -N -u NONE -i NONE -S test/run.vim' \
       /dev/null >/dev/null || status=1
   fi
-  if command -v nvim >/dev/null; then
+  if has_editor nvim; then
     expected=$((expected + 1))
     VUE_TEST_CASE=$name VUE_TEST_OUT=$out timeout 60 \
       nvim --headless -u NONE -i NONE -S test/run.vim || status=1
@@ -42,6 +59,7 @@ passed=$(grep -c '^ok' "$out")
 failed=$(grep -c '^FAIL' "$out")
 missing=$((expected - passed - failed))
 echo "$passed passed, $failed failed, $missing without result"
-[ $failed -eq 0 ] && [ $missing -eq 0 ] || status=1
+[ $expected -gt 0 ] || echo "No editor found in: $editors"
+[ $expected -gt 0 ] && [ $failed -eq 0 ] && [ $missing -eq 0 ] || status=1
 rm -f "$out"
 exit $status