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|
//! Example binary testing: build each example and run its `test.toml` cases.
use std::process::Output;
/// A single `[[runs]]` entry of an example's `test.toml`.
pub(crate) struct TestCase {
input: Vec<String>,
expect: Expect,
}
struct Expect {
exit_code: i32,
result: String,
}
/// One example and its test cases.
pub(crate) struct ExampleCase {
name: String,
cases: Vec<TestCase>,
}
/// Outcome of checking one example.
pub(crate) struct ExampleOutcome {
pub name: String,
pub location: String,
pub ok: bool,
pub output: String,
}
/// Loads `examples/<name>/test.toml` for every example that has one, in
/// alphabetical order of the example directory name.
pub(crate) fn load_test_configs() -> Vec<ExampleCase> {
let mut configs = Vec::new();
if let Ok(entries) = std::fs::read_dir("examples") {
for entry in entries.flatten() {
let path = entry.path();
if !path.is_dir() {
continue;
}
let test_toml = path.join("test.toml");
if !test_toml.is_file() {
continue;
}
let name = path
.file_name()
.and_then(|n| n.to_str())
.unwrap_or_default()
.to_string();
let Ok(content) = std::fs::read_to_string(&test_toml) else {
continue;
};
let Ok(table) = content.parse::<toml::Value>() else {
continue;
};
let Some(cases) = parse_cases(&table) else {
continue;
};
configs.push(ExampleCase { name, cases });
}
}
configs.sort_by(|a, b| a.name.cmp(&b.name));
configs
}
fn parse_cases(table: &toml::Value) -> Option<Vec<TestCase>> {
let runs = table.get("runs")?.as_array()?;
let mut cases = Vec::new();
for run in runs {
let input: Vec<String> = run
.get("input")?
.as_array()?
.iter()
.filter_map(|v| v.as_str().map(str::to_string))
.collect();
let expect = run.get("expect")?;
let exit_code = expect
.get("exit-code")?
.as_integer()
.and_then(|e| i32::try_from(e).ok())
.unwrap_or(-1);
let result = expect
.get("result")
.and_then(|r| r.as_str())
.unwrap_or_default()
.to_string();
cases.push(TestCase {
input,
expect: Expect { exit_code, result },
});
}
Some(cases)
}
/// Builds the example, then runs all of its test cases.
pub(crate) fn check_example(example: ExampleCase) -> ExampleOutcome {
let location = format!("./examples/{}", example.name);
// Phase 1: build.
let manifest = format!("examples/{}/Cargo.toml", example.name);
let build = std::process::Command::new("cargo")
.args(["build", "--manifest-path", &manifest])
.output();
match build {
Ok(output) if !output.status.success() => ExampleOutcome {
name: example.name,
location,
ok: false,
output: build_error(&output),
},
Err(e) => ExampleOutcome {
name: example.name,
location,
ok: false,
output: format!("failed to run cargo: {e}"),
},
Ok(_) => {
// Phase 2: run the test cases against the built binary.
let mut failures = Vec::new();
for case in &example.cases {
if let Err(detail) = run_case(&example.name, case) {
failures.push(detail);
}
}
ExampleOutcome {
name: example.name,
location,
ok: failures.is_empty(),
output: failures.join("\n\n"),
}
}
}
}
/// Runs a single test case against the built binary.
fn run_case(name: &str, case: &TestCase) -> Result<(), String> {
let exe = if cfg!(target_os = "windows") {
".exe"
} else {
""
};
let binary = format!(".temp/target/debug/{name}{exe}");
let output = std::process::Command::new(&binary)
.args(&case.input)
.output();
let Ok(output) = output else {
return Err(format!("failed to run {binary}"));
};
let actual_exit_code = output.status.code().unwrap_or(-1);
let actual_stdout = String::from_utf8_lossy(&output.stdout).trim().to_string();
let actual_stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();
let exit_ok = actual_exit_code == case.expect.exit_code;
let result_ok =
actual_stdout == case.expect.result || actual_stdout.contains(&case.expect.result);
if exit_ok && result_ok {
return Ok(());
}
let mut details = vec![format!("input: {}", case.input.join(" "))];
if !exit_ok {
details.push(format!(
"expected exit code {}, actual {actual_exit_code}",
case.expect.exit_code
));
}
if !result_ok {
details.push(format!("expected output {:?}", case.expect.result));
details.push(format!("actual stdout {actual_stdout:?}"));
if !actual_stderr.is_empty() {
details.push(format!("actual stderr {actual_stderr:?}"));
}
}
Err(details.join("\n"))
}
/// Tail of a failed build's combined output.
fn build_error(output: &Output) -> String {
let mut log = String::from_utf8_lossy(&output.stdout).into_owned();
log.push_str(&String::from_utf8_lossy(&output.stderr));
let lines: Vec<&str> = log.lines().collect();
let tail = &lines[lines.len().saturating_sub(20)..];
format!("build failed\n{}", tail.join("\n"))
}
|
