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# Copyright 2020 Google LLC
#
# 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
#
# https://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.
"""Compare rule output to a golden version."""
def golden_test(
name,
golden,
subject):
"""Check that output from a rule matches the expected output.
Args:
name: test name
golden: expected content of subect
subject: build target
"""
native.sh_test(
name = name,
size = "medium",
srcs = ["@rules_license//tools:diff_test.sh"],
args = [
"$(location %s)" % golden,
"$(location %s)" % subject,
],
data = [
subject,
golden,
],
)
def golden_cmd_test(
name,
cmd,
golden, # Required
toolchains = [],
tools = None,
exec_tools = None,
srcs = [], # Optional
**kwargs): # Rest
"""Compares cmd output to golden output, passes if they are identical.
Args:
name: Name of the build rule.
cmd: The command to run to generate output.
golden: The golden file to be compared.
toolchains: List of toolchains needed to run the command, passed to genrule.
tools: List of tools needed to run the command, passed to genrule.
exec_tools: List of tools needed to run the command, passed to genrule.
srcs: List of sources needed as input to the command, passed to genrule.
**kwargs: Any additional parameters for the generated golden_test.
"""
actual = name + ".output"
# There are some cases where tools are provided and exec_tools are provided.
# Specifying both in the same genrule, confuses the host vs exec rules,
# which prevents python3 from execution.
if tools and exec_tools:
fail("Only set one: tools or exec_tools. " +
"Setting both confuses python execution mode (host vs exec).")
native.genrule(
name = name + "_output",
srcs = srcs,
outs = [actual],
cmd = cmd + " > '$@'", # Redirect to collect output
toolchains = toolchains,
tools = tools,
exec_tools = exec_tools,
testonly = True,
)
golden_test(
name = name,
subject = actual,
golden = golden,
**kwargs
)
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