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// Copyright 2023 Martin Pool
//! Tests for error value mutations, from `--error-value` etc.
use std::{
env,
fs::{create_dir_all, rename},
};
use indoc::indoc;
use predicates::prelude::*;
mod util;
use tempfile::TempDir;
use util::{copy_of_testdata, run};
#[test]
fn error_value_catches_untested_ok_case() {
// By default this tree should fail because it's configured to
// generate an error value, and the tests forgot to check that
// the code under test does return Ok.
let tmp = copy_of_testdata("error_value");
run()
.arg("mutants")
.args(["-v", "-V", "--no-times", "--no-shuffle"])
.arg("-d")
.arg(tmp.path())
.assert()
.code(2)
.stderr("");
}
#[test]
fn no_config_option_disables_config_file_so_error_value_is_not_generated() {
// In this case, the config file is not loaded. Error values are not
// generated by default (because we don't know what a good value for
// this tree would be), so no mutants are caught.
let tmp_src_dir = copy_of_testdata("error_value");
run()
.arg("mutants")
.args(["-v", "-V", "--no-times", "--no-shuffle", "--no-config"])
.arg("-d")
.arg(tmp_src_dir.path())
.assert()
.code(0)
.stderr("")
.stdout(predicate::function(|stdout: &str| {
insta::assert_snapshot!(stdout);
true
}));
}
#[test]
fn list_mutants_with_error_value_from_command_line_list() {
// This is not a good error mutant for this tree, which uses
// anyhow, but it's a good test of the command line option.
let tmp_src_dir = copy_of_testdata("error_value");
run()
.arg("mutants")
.args([
"--no-times",
"--no-shuffle",
"--no-config",
"--list",
"--error=::eyre::eyre!(\"mutant\")",
])
.arg("-d")
.arg(tmp_src_dir.path())
.assert()
.code(0)
.stderr("")
.stdout(predicate::function(|stdout: &str| {
insta::assert_snapshot!(stdout);
true
}));
}
#[test]
fn warn_if_error_value_starts_with_err() {
// Users might misunderstand what should be passed to --error,
// so give a warning.
let tmp_src_dir = copy_of_testdata("error_value");
run()
.arg("mutants")
.args([
"--no-times",
"--no-shuffle",
"--no-config",
"--list",
"--error=Err(anyhow!(\"mutant\"))",
])
.arg("-d")
.arg(tmp_src_dir.path())
.assert()
.code(0)
.stderr(predicate::str::contains(
"error_value option gives the value of the error, and probably should not start with Err(: got Err(anyhow!(\"mutant\"))"
));
}
#[test]
fn warn_unresolved_module() {
let tmp_src_dir = copy_of_testdata("dangling_mod");
run()
.arg("mutants")
.args(["--no-times", "--no-shuffle", "--no-config", "--list"])
.arg("-d")
.arg(tmp_src_dir.path())
.assert()
.code(0)
.stderr(predicate::str::contains(
r#"referent of mod not found definition_site="src/main.rs:3:1" mod_name=nonexistent"#,
));
}
#[test]
fn warn_module_outside_of_tree() {
// manually copy tree, so that external path still resolves correctly for `cargo`
//
// [TEMP]/dangling_mod/*
// [TEMP]/nested_mod/src/paths_in_main/a/foo.rs
//
let tree_name = "dangling_mod";
let tmp_src_dir_parent = TempDir::with_prefix("warn_module_outside_of_tree").unwrap();
let tmp_src_dir = tmp_src_dir_parent.path().join("dangling_mod");
cp_r::CopyOptions::new()
.filter(|path, _stat| {
Ok(["target", "mutants.out", "mutants.out.old"]
.iter()
.all(|p| !path.starts_with(p)))
})
.copy_tree(
std::path::Path::new("testdata").join(tree_name),
&tmp_src_dir,
)
.unwrap();
rename(
tmp_src_dir.join("Cargo_test.toml"),
tmp_src_dir.join("Cargo.toml"),
)
.unwrap();
let external_file_path = tmp_src_dir_parent
.path()
.join("nested_mod/src/paths_in_main/a");
create_dir_all(&external_file_path).unwrap();
std::fs::copy(
std::path::Path::new("testdata/nested_mod/src/paths_in_main/a/foo.rs"),
external_file_path.join("foo.rs"),
)
.unwrap();
run()
.arg("mutants")
.args(["--no-times", "--no-shuffle", "--no-config", "--list"])
.arg("-d")
.arg(tmp_src_dir)
.assert()
.code(0)
.stderr(predicate::str::contains(
r#"skipping source outside of tree: "src/../../nested_mod/src/paths_in_main/a/foo.rs""#,
));
}
#[test]
fn fail_when_error_value_does_not_parse() {
let tmp_src_dir = copy_of_testdata("error_value");
run()
.arg("mutants")
.args([
"--no-times",
"--no-shuffle",
"--no-config",
"--list",
"--error=shouldn't work",
])
.arg("-d")
.arg(tmp_src_dir.path())
.assert()
.code(1)
.stderr(predicate::str::contains(indoc! { "
Error: Failed to parse error value \"shouldn\'t work\"
Caused by:
unexpected token
"}))
.stdout(predicate::str::is_empty());
}
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