mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-04 22:02:52 +01:00
Jon Ross-Perkins
a3b1c433be
I'd kept these in to separate the bazel module update from the BUILD file changes, then forgot about it. I think all of these can be cleanly removed now. I think it's something we should clean up for consistency with the bazel central repository names; I think it's best to reduce that divergence. llvm_zlib and llvm_zstd remain because of how llvm depends on the particular names.
141 lines
4.1 KiB
Markdown
141 lines
4.1 KiB
Markdown
# file_test
|
|
|
|
<!--
|
|
Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
Exceptions. See /LICENSE for license information.
|
|
SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
-->
|
|
|
|
## BUILD
|
|
|
|
A typical BUILD target will look like:
|
|
|
|
```
|
|
load("rules.bzl", "file_test")
|
|
|
|
file_test(
|
|
name = "my_file_test",
|
|
srcs = ["my_file_test.cpp"],
|
|
tests = glob(["testdata/**"]),
|
|
deps = [
|
|
":my_lib",
|
|
"//testing/file_test:file_test_base",
|
|
"@googletest//:gtest",
|
|
"@llvm-project//llvm:Support",
|
|
],
|
|
)
|
|
```
|
|
|
|
## Implementation
|
|
|
|
A typical implementation will look like:
|
|
|
|
```
|
|
#include "my_library.h"
|
|
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "testing/file_test/file_test_base.h"
|
|
|
|
namespace Carbon::Testing {
|
|
namespace {
|
|
|
|
class MyFileTest : public FileTestBase {
|
|
public:
|
|
using FileTestBase::FileTestBase;
|
|
|
|
// Called as part of individual test executions.
|
|
auto Run(const llvm::SmallVector<llvm::StringRef>& test_args,
|
|
const llvm::SmallVector<TestFile>& test_files,
|
|
llvm::raw_pwrite_stream& stdout, llvm::raw_pwrite_stream& stderr)
|
|
-> ErrorOr<bool> override {
|
|
MyFunctionality(test_args, stdout, stderr);
|
|
}
|
|
|
|
// Provides arguments which are used in tests that don't provide ARGS.
|
|
auto GetDefaultArgs() -> llvm::SmallVector<std::string> override {
|
|
return {"default_args", "%s"};
|
|
}
|
|
};
|
|
|
|
} // namespace
|
|
|
|
// Registers for the framework to construct the tests.
|
|
CARBON_FILE_TEST_FACTORY(MyFileTest);
|
|
|
|
} // namespace Carbon::Testing
|
|
```
|
|
|
|
## Comment markers
|
|
|
|
Settings in files are provided in comments, similar to `FileCheck` syntax.
|
|
`bazel run :file_test -- --autoupdate` automatically constructs compatible
|
|
CHECK:STDOUT: and CHECK:STDERR: lines.
|
|
|
|
Supported comment markers are:
|
|
|
|
- ```
|
|
// AUTOUDPATE
|
|
// NOAUTOUPDATE
|
|
```
|
|
|
|
Controls whether the checks in the file will be autoupdated if --autoupdate
|
|
is passed. Exactly one of these two markers must be present. If the file
|
|
uses splits, AUTOUPDATE must currently be before any splits.
|
|
|
|
When autoupdating, CHECKs will be inserted starting below AUTOUPDATE. When a
|
|
CHECK has line information, autoupdate will try to insert the CHECK
|
|
immediately next to the line it's associated with, with stderr CHECKs
|
|
preceding the line and stdout CHECKs following the line. When that happens,
|
|
any subsequent CHECK lines without line information, or that refer to lines
|
|
appearing earlier, will immediately follow. As an exception, if no STDOUT
|
|
check line refers to any line in the test, all STDOUT check lines are placed
|
|
at the end of the file instead of immediately after AUTOUPDATE.
|
|
|
|
- `// ARGS: <arguments>`
|
|
|
|
Provides a space-separated list of arguments, which will be passed to
|
|
RunWithFiles as test_args. These are intended for use by the command as
|
|
arguments.
|
|
|
|
Supported replacements within arguments are:
|
|
|
|
- `%s`
|
|
|
|
Replaced with the list of files. Currently only allowed as a standalone
|
|
argument, not a substring.
|
|
|
|
- `%t`
|
|
|
|
Replaced with `${TEST_TMPDIR}/temp_file`.
|
|
|
|
ARGS can be specified at most once. If not provided, the FileTestBase child
|
|
is responsible for providing default arguments.
|
|
|
|
- `// SET-CHECK-SUBSET`
|
|
|
|
By default, all lines of output must have a CHECK match. Adding this as a
|
|
option sets it so that non-matching lines are ignored. All provided
|
|
CHECK:STDOUT: and CHECK:STDERR: lines must still have a match in output.
|
|
|
|
SET-CHECK-SUBSET can be specified at most once.
|
|
|
|
- `// --- <filename>`
|
|
|
|
By default, all file content is provided to the test as a single file in
|
|
test_files. Using this marker allows the file to be split into multiple
|
|
files which will all be passed to test_files.
|
|
|
|
Files are not created on disk; it's expected the child will create an
|
|
InMemoryFilesystem if needed.
|
|
|
|
- ```
|
|
// CHECK:STDOUT: <output line>
|
|
// CHECK:STDERR: <output line>
|
|
```
|
|
|
|
These provide a match for output from the command. See `SET-CHECK-SUBSET`
|
|
for how to change from full to subset matching of output.
|
|
|
|
Output line matchers may contain `[[@LINE+offset]` and `{{regex}}` syntaxes,
|
|
similar to `FileCheck`.
|