tweak query test runner

test/query/run.bash

@@ -19,6 +19,7 @@ target() {
 if [[ $1 == 'update' ]]
 then
   update=1
+  shift
 fi
 
   tree-sitter test -f 'just compile it' >/dev/null
@@ -43,9 +44,24 @@ test_file() {
   fi
 }
 
-for n in $base/*.target
-do
-  test_file $(basename ${n%.*})
-done
+if [[ -n $1 ]]
+then
+
+  if [[ -f "$(target $1)" ]]
+  then
+    test_file $1
+  else
+    echo -e "\e[35m>>>\e[m \e[31mNo such test: \e[34m${1}\e[m"
+    exit 1
+  fi
+
+else
+
+  for n in $base/*.target
+  do
+    test_file $(basename ${n%.*})
+  done
+
+fi
 
 echo -e "\e[35m>>>\e[m All query tests succeeded."