add test

test/version.bats

@@ -70,3 +70,17 @@ pyenv-version-without-stderr() {
 3.3.3 (set by PYENV_VERSION environment variable)
 OUT
 }
+
+@test "--bare is an alias to pyenv-version-name" {
+  mkdir -p "$PYENV_TEST_DIR/bin"
+  export PATH="$PYENV_TEST_DIR/bin:$PATH"
+  echo >"$PYENV_TEST_DIR/bin/pyenv-version-name" <<!
+#!/usr/bin/env bash
+echo 'pyenv-version-name stub'
+!
+  run pyenv-version --bare
+  assert_success
+  assert_output <<OUT
+pyenv-version-name stub
+OUT
+}