#!/bin/bash
#
# Copyright 2016 The Bazel Authors. 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.

# Load test environment
source $(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/testenv.sh \
  || { echo "testenv.sh not found!" >&2; exit 1; }

create_and_cd_client
put_bazel_on_path
EXTRA_BAZELRC="test --nocache_test_results"
write_default_bazelrc

# End of preamble.

function create_test_files() {
  # We use hardlinks to this file as a communication mechanism between
  # test runs.
  touch $TEST_TMPDIR/counter

  mkdir dir

  cat <<EOF > dir/test.sh
#!/bin/sh
# hard link
z=$TEST_TMPDIR/\$(basename \$(mktemp -u))
ln $TEST_TMPDIR/counter \${z}

# Make sure other test runs have started too.
sleep 1
nlink=\$(ls -l $TEST_TMPDIR/counter | awk '{print \$2}')

# 4 links = 3 jobs + $TEST_TMPDIR/counter
if [[ "\$nlink" -gt 4 ]] ; then
  echo found "\$nlink" hard links to file, want 4 max.
  exit 1
fi

# Ensure that we don't remove before other runs have inspected the file.
sleep 1
rm \${z}

EOF

  chmod +x dir/test.sh

  cat <<EOF > dir/BUILD
sh_test(
  name = "test",
  srcs = [ "test.sh" ],
  size = "small",
  tags = [ "local" ],
)
EOF
}

function test_local_test_jobs_constrains_test_execution() {
  create_test_files
  # 3 local test jobs, so no more than 3 tests in parallel.
  bazel test --local_test_jobs=3 --local_resources=10000,10,100 --runs_per_test=10 \
      //dir:test
}

function test_no_local_test_jobs_causes_local_resources_to_constrain_test_execution() {
  create_test_files
  # unlimited local test jobs, so local resources enforces 3 tests in parallel.
  bazel test --local_resources=10000,3,100 --runs_per_test=10 \
      //dir:test
}

function test_local_test_jobs_exceeds_jobs_causes_warning() {
  create_test_files
  # 10 local test jobs, but only 3 jobs, so warning is printed, and only 3 tests run concurrently
  bazel test --jobs=3 --local_test_jobs=10 --local_resources=10000,10,100 --runs_per_test=10 \
      //dir:test >& $TEST_log

  expect_log 'High value for --local_test_jobs'
}

function test_negative_local_test_jobs_causes_warning() {
  create_test_files
  bazel test --local_test_jobs=-1 --local_resources=10000,10,100 --runs_per_test=10 \
      //dir:test >& $TEST_log && fail "Expected test failure"

  expect_log 'Invalid parameter for --local_test_jobs'
}

run_suite "Tests for --local_test_jobs option."