rust/tests/testutils/src/lib.rs

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extern crate difference;
extern crate file;
use std::fs::read_dir;
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use std::path::{Path, PathBuf};
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use difference::Changeset;
/// Read file and normalize newlines.
///
/// `rustc` seems to always normalize `\r\n` newlines to `\n`:
///
/// ```
/// let s = "
/// ";
/// assert_eq!(s.as_bytes(), &[10]);
/// ```
///
/// so this should always be correct.
fn read_text(path: &Path) -> String {
file::get_text(path).unwrap().replace("\r\n", "\n")
}
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pub fn dir_tests<F>(paths: &[&str], f: F)
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where
F: Fn(&str) -> String,
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{
for path in collect_tests(paths) {
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let input_code = read_text(&path);
let parse_tree = f(&input_code);
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let path = path.with_extension("txt");
if !path.exists() {
println!("\nfile: {}", path.display());
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println!("No .txt file with expected result, creating...\n");
println!("{}\n{}", input_code, parse_tree);
file::put_text(&path, parse_tree).unwrap();
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panic!("No expected result")
}
let expected = read_text(&path);
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let expected = expected.as_str();
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let parse_tree = parse_tree.as_str();
assert_equal_text(expected, parse_tree, &path);
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}
}
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fn assert_equal_text(expected: &str, actual: &str, path: &Path) {
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if expected != actual {
print_difference(expected, actual, path)
}
}
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fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
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paths
.iter()
.flat_map(|path| {
let path = test_data_dir().join(path);
test_from_dir(&path).into_iter()
})
.collect()
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}
fn test_from_dir(dir: &Path) -> Vec<PathBuf> {
let mut acc = Vec::new();
for file in read_dir(&dir).unwrap() {
let file = file.unwrap();
let path = file.path();
if path.extension().unwrap_or_default() == "rs" {
acc.push(path);
}
}
acc.sort();
acc
}
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const REWRITE: bool = false;
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fn print_difference(expected: &str, actual: &str, path: &Path) {
let dir = project_dir();
let path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
if expected.trim() == actual.trim() {
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println!("whitespace difference, rewriting");
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println!("file: {}\n", path.display());
file::put_text(path, actual).unwrap();
return;
}
if REWRITE {
println!("rewriting {}", path.display());
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file::put_text(path, actual).unwrap();
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return;
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}
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let changeset = Changeset::new(actual, expected, "\n");
print!("{}", changeset);
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println!("file: {}\n", path.display());
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panic!("Comparison failed")
}
fn project_dir() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir)
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.parent()
.unwrap()
.parent()
.unwrap()
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.to_owned()
}
fn test_data_dir() -> PathBuf {
project_dir().join("tests/data")
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}