Add test for `/bin/python` case

test/prefix.bats

@@ -24,6 +24,15 @@ load test_helper
   assert_success "$PYENV_TEST_DIR"
 }
 
+@test "prefix for system in /" {
+  mkdir -p "${PYENV_TEST_DIR}/bin"
+  touch "${PYENV_TEST_DIR}/bin/pyenv-which"
+  echo "echo /bin/python" >"${PYENV_TEST_DIR}/bin/pyenv-which"
+  chmod +x "${PYENV_TEST_DIR}/bin/pyenv-which"
+  PYENV_VERSION="system" run pyenv-prefix
+  assert_success "/"
+}
+
 @test "prefix for invalid system" {
   PATH="$(path_without python)" run pyenv-prefix system
   assert_failure "pyenv: system version not found in PATH"

test/test_helper.bash

@@ -20,10 +20,10 @@ if [ -z "$PYENV_TEST_DIR" ]; then
   export PYENV_HOOK_PATH="${PYENV_ROOT}/pyenv.d"
 
   PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
-  PATH="${PYENV_TEST_DIR}/bin:$PATH"
   PATH="${BATS_TEST_DIRNAME}/../libexec:$PATH"
   PATH="${BATS_TEST_DIRNAME}/libexec:$PATH"
   PATH="${PYENV_ROOT}/shims:$PATH"
+  PATH="${PYENV_TEST_DIR}/bin:$PATH"
   export PATH
 
   for xdg_var in `env 2>/dev/null | grep ^XDG_ | cut -d= -f1`; do unset "$xdg_var"; done