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Add test demonstrating deduplication of errors.

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This commit is contained in:
Eric Huss 2021-07-15 17:37:21 -07:00
parent 493e8b7dd1
commit 13fef863ab
1 changed files with 34 additions and 6 deletions
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40
tests/testsuite/messages.rs
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@ -3,6 +3,7 @@
//! Tests for message caching can be found in `cache_messages`.
use cargo_test_support::{process, project, Project};
use cargo_util::ProcessError;
/// Captures the actual diagnostics displayed by rustc. This is done to avoid
/// relying on the exact message formatting in rustc.
@ -14,20 +15,24 @@ pub fn raw_rustc_output(project: &Project, path: &str, extra: &[&str]) -> String
} else {
proc.arg(path);
}
let rustc_output = proc
let rustc_output = match proc
.arg("--crate-type=lib")
.args(extra)
.cwd(project.root())
.exec_with_output()
.expect("rustc to run");
assert!(rustc_output.stdout.is_empty());
assert!(rustc_output.status.success());
{
Ok(output) => output.stderr,
Err(e) => e.downcast::<ProcessError>().unwrap().stderr.unwrap(),
};
// Do a little dance to remove rustc's "warnings emitted" message and the subsequent newline.
let stderr = std::str::from_utf8(&rustc_output.stderr).expect("utf8");
let stderr = std::str::from_utf8(&rustc_output).expect("utf8");
let mut lines = stderr.lines();
let mut result = String::new();
while let Some(line) = lines.next() {
if line.contains("warning emitted") || line.contains("warnings emitted") {
if line.contains("warning emitted")
|| line.contains("warnings emitted")
|| line.contains("aborting due to")
{
// Eat blank line.
match lines.next() {
None | Some("") => continue,
@ -112,3 +117,26 @@ warning: `foo` (lib test) generated 2 warnings (1 duplicate)
.with_stderr(expected_output)
.run();
}
#[cargo_test]
fn deduplicate_errors() {
let p = project()
.file(
"src/lib.rs",
r#"
this should not compile
"#,
)
.build();
let rustc_message = raw_rustc_output(&p, "src/lib.rs", &[]);
p.cargo("test -j1")
.with_status(101)
.with_stderr(&format!(
"\
[COMPILING] foo v0.0.1 [..]
{}error: could not compile `foo` due to previous error
",
rustc_message
))
.run();
}