pyenv-binary: test the save subcommand

Cover argument validation, the version-name guard, and packaging an
installed version into an archive with matching metadata.

plugins/pyenv-binary/test/save.bats

@@ -0,0 +1,51 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+create_version() {
+  mkdir -p "${PYENV_ROOT}/versions/$1/bin"
+}
+
+platform() {
+  echo "$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -m)"
+}
+
+@test "fails with no version given" {
+  run pyenv-binary-save
+  assert_failure "Usage: pyenv binary save <version> [<output-dir>]"
+}
+
+@test "fails for a version that is not installed" {
+  run pyenv-binary-save 9.9.9
+  assert_failure "pyenv-binary: version \`9.9.9' is not installed"
+}
+
+@test "rejects a version name containing a slash" {
+  run pyenv-binary-save "foo/bar"
+  assert_failure "pyenv-binary: invalid version name \`foo/bar'"
+}
+
+@test "rejects a version name that walks out of versions/" {
+  run pyenv-binary-save "../../etc"
+  assert_failure "pyenv-binary: invalid version name \`../../etc'"
+}
+
+@test "packages an installed version" {
+  create_version "3.12.7"
+  local out="${BATS_TEST_TMPDIR}/dist"
+  run pyenv-binary-save "3.12.7" "$out"
+  assert_success "Saved 3.12.7-$(platform).tar.gz and 3.12.7-$(platform).meta to $out"
+  assert [ -f "${out}/3.12.7-$(platform).tar.gz" ]
+  assert [ -f "${out}/3.12.7-$(platform).meta" ]
+}
+
+@test "records the platform in the metadata" {
+  create_version "3.12.7"
+  local out="${BATS_TEST_TMPDIR}/dist"
+  pyenv-binary-save "3.12.7" "$out" >/dev/null
+  run cat "${out}/3.12.7-$(platform).meta"
+  assert_success
+  assert_output_contains "version=3.12.7"
+  assert_output_contains "platform=$(platform)"
+  assert_output_contains "archive=3.12.7-$(platform).tar.gz"
+}

plugins/pyenv-binary/test/test_helper.bash

@@ -0,0 +1,68 @@
+setup() {
+  export PYENV_ROOT="${BATS_TEST_TMPDIR}/root"
+  PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
+  PATH="${BATS_TEST_DIRNAME}/../libexec:$PATH"
+  export PATH
+
+  # If test specific setup exist, run it
+  if [[ $(type -t _setup) == function ]]; then
+    _setup
+  fi
+}
+
+flunk() {
+  { if [ "$#" -eq 0 ]; then cat -
+    else echo "$@"
+    fi
+  } | sed "s:${BATS_TEST_TMPDIR}:\${BATS_TEST_TMPDIR}:g" >&2
+  return 1
+}
+
+assert() {
+  if ! "$@"; then
+    flunk "failed: $@"
+  fi
+}
+
+assert_success() {
+  if [ "$status" -ne 0 ]; then
+    { echo "command failed with exit status $status"
+      echo "output: $output"
+    } | flunk
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_failure() {
+  if [ "$status" -eq 0 ]; then
+    flunk "expected failed exit status"
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_equal() {
+  if [ "$1" != "$2" ]; then
+    { echo "expected: $1"
+      echo "actual:   $2"
+    } | flunk
+  fi
+}
+
+assert_output() {
+  local expected
+  if [ $# -eq 0 ]; then expected="$(cat -)"
+  else expected="$1"
+  fi
+  assert_equal "$expected" "$output"
+}
+
+assert_output_contains() {
+  local expected="$1"
+  echo "$output" | grep -F "$expected" >/dev/null || {
+    { echo "expected output to contain: $expected"
+      echo "actual: $output"
+    } | flunk
+  }
+}