diff --git a/tests/entrypoint.sh b/tests/entrypoint.sh
index afafe3d..e196afe 100644
--- a/tests/entrypoint.sh
+++ b/tests/entrypoint.sh
@@ -1,14 +1,25 @@
 set -e
 
+REGEXS=()
+
 while [[ $# -gt 0 ]]; do
   case $1 in
     -v|--verbose)
       VERBOSE=1
-      shift;
+      shift
+      ;;
+    -h|--help)
+        cat <<EOF
+USAGE: [flags] [test regexs...]
+FLAGS
+    --verbose (-v)
+    --help    (-h)
+EOF
+      exit 1
       ;;
     *)
-      echo "USAGE: [-v|--verbose]"
-      exit 1
+      REGEXS+=("$1")
+      shift
       ;;
   esac
 done
@@ -30,25 +41,35 @@ test_files=$(
     | sort -n\
 )
 
+for r in "${REGEXS[@]}"; do
+    test_files="$(echo "$test_files" | grep -P "$r")"
+done
+
 echo -e "number of tests: $(echo "$test_files" | wc -l)\n"
 for file in $test_files; do
     echo "$file"
 
     [ -z "$VERBOSE" ] && output="$TMPDIR/$file.log" || output=/dev/stdout
 
-    tmp="$TMPDIR/$file.tmp"
-    mkdir -p "$tmp"
+    (
+        export TMPDIR="$TMPDIR/$file.tmp"
+        export XDG_RUNTIME_DIR="$TMPDIR/.run"
+        export XDG_DATA_HOME="$TMPDIR/.data"
 
-    if ! (cd "$tmp" && TMPDIR="$tmp" $SHELL -e -x "$root/$file" >"$output" 2>&1); then
-        echo "$file FAILED"
-        if [ -z "$VERBOSE" ]; then
-            echo "output of test is as follows"
-            echo "------------------------------"
-            cat "$TMPDIR/$file.log"
-            echo "------------------------------"
+        mkdir -p "$TMPDIR" "$XDG_RUNTIME_DIR" "$XDG_DATA_HOME"
+        cd "$TMPDIR"
+
+        if ! $SHELL -e -x "$root/$file" >"$output" 2>&1; then
+            echo "$file FAILED"
+            if [ -z "$VERBOSE" ]; then
+                echo "output of test is as follows"
+                echo "------------------------------"
+                cat "$output"
+                echo "------------------------------"
+            fi
+            exit 1
         fi
-        exit 1
-    fi
+    )
 done
 
 echo -e '\nall tests succeeded!'