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Fix test_arg for file_test.subset (#2863)

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I believe this broke when I was changing path handling.

Bad:

```
  bazel test //testing/file_test:file_test_base_test.subset --test_arg=/usr/local/...elided.../execroot/carbon/bazel-out/k8-fastbuild/bin/testing/file_test/file_test_base_test.runfiles/carbon/testing/file_test/example.carbon
```

Good:

```
  bazel test //testing/file_test:file_test_base_test.subset --test_arg=testing/file_test/example.carbon
```
This commit is contained in:
Jon Ross-Perkins
2023-06-01 14:44:17 -07:00
committed by GitHub
parent db5629024e
commit a7939ab22f
1 changed files with 5 additions and 1 deletions
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testing/file_test/file_test_base.cpp
+5 -1
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@@ -64,8 +64,12 @@ static auto SplitOutput(llvm::StringRef output)
// Runs a test and compares output. This keeps output split by line so that
// issues are a little easier to identify by the different line.
auto FileTestBase::TestBody() -> void {
const char* src_dir = getenv("TEST_SRCDIR");
CARBON_CHECK(src_dir);
std::string test_file = path().lexically_relative(
std::filesystem::path(src_dir).append("carbon"));
llvm::errs() << "\nTo test this file alone, run:\n bazel test "
<< *subset_target << " --test_arg=" << path() << "\n\n";
<< *subset_target << " --test_arg=" << test_file << "\n\n";
// Load expected output.
std::vector<testing::Matcher<std::string>> expected_stdout;