Use a sh_test instead of a py_test to test Bazelisk

.bazelci/config.yml

@@ -16,4 +16,5 @@ platforms:
     test_targets:
       - //:bazelisk_test
     test_flags:
+      - --test_env=PATH
       - --test_env=PROCESSOR_ARCHITECTURE

.gitignore

@@ -0,0 +1,4 @@
+# Ignore all bazel-* symlinks. There is no full list since this can change
+# based on the name of the directory bazel is cloned into.
+/bazel-*
+

BUILD

@@ -1,10 +1,11 @@
-py_library(
-    name = "bazelisk_lib",
+py_binary(
+    name = "bazelisk",
     srcs = ["bazelisk.py"],
 )
 
-py_test(
+sh_test(
     name = "bazelisk_test",
-    srcs = ["bazelisk_test.py"],
-    deps = [":bazelisk_lib"],
+    srcs = ["bazelisk_test.sh"],
+    data = [":bazelisk"],
+    deps = ["@bazel_tools//tools/bash/runfiles"],
 )

WORKSPACE

@@ -1 +0,0 @@
-

bazelisk_test.sh

@@ -0,0 +1,100 @@
+#!/bin/bash
+
+# Copyright 2018 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+# --- begin runfiles.bash initialization ---
+if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+    if [[ -f "$0.runfiles_manifest" ]]; then
+      export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
+    elif [[ -f "$0.runfiles/MANIFEST" ]]; then
+      export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
+    elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+      export RUNFILES_DIR="$0.runfiles"
+    fi
+fi
+if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+  source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+  source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
+            "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
+else
+  echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
+  exit 1
+fi
+# --- end runfiles.bash initialization ---
+
+function setup() {
+  cd "$(mktemp -d $TEST_TMPDIR/workspace.XXXXXX)"
+  touch WORKSPACE BUILD
+}
+
+function bazelisk() {
+  case "$(uname -s)" in
+    MINGW*|MSYS*)
+      # We can change this to just call bazelisk.exe when this is fixed:
+      # https://github.com/bazelbuild/bazel/issues/7190
+      python "$(rlocation __main__/bazelisk.py)" "$@"
+      ;;
+    *)
+      "$(rlocation __main__/bazelisk)" "$@"
+      ;;
+  esac
+}
+
+function test_bazel_version() {
+  setup
+
+  BAZELISK_HOME="$(mktemp -d $TEST_TMPDIR/home.XXXXXX)" \
+      bazelisk version 2>&1 | tee log
+
+  grep "Build label" log || \
+      (echo "FAIL: Expected to find 'Build label' in the output of 'bazelisk version'"; exit 1)
+}
+
+function test_bazel_version_from_environment() {
+  setup
+
+  USE_BAZEL_VERSION="0.20.0" \
+      BAZELISK_HOME="$(mktemp -d $TEST_TMPDIR/home.XXXXXX)" \
+      bazelisk version 2>&1 | tee log
+
+  grep "Build label: 0.20.0" log || \
+      (echo "FAIL: Expected to find 'Build label: 0.20.0' in the output of 'bazelisk version'"; exit 1)
+}
+
+function test_bazel_version_from_file() {
+  setup
+
+  echo "0.19.0" > .bazelversion
+
+  BAZELISK_HOME="$(mktemp -d $TEST_TMPDIR/home.XXXXXX)" \
+      bazelisk version 2>&1 | tee log
+
+  grep "Build label: 0.19.0" log || \
+      (echo "FAIL: Expected to find 'Build label: 0.19.0' in the output of 'bazelisk version'"; exit 1)
+}
+
+echo "# test_bazel_version"
+test_bazel_version
+echo
+
+echo "# test_bazel_version_from_environment"
+test_bazel_version_from_environment
+echo
+
+echo "# test_bazel_version_from_file"
+test_bazel_version_from_file
+echo