cairo_lang_test_utils/
lib.rs

#![cfg(feature = "testing")]

pub mod parse_test_file;
use std::fs;
use std::path::Path;
use std::str::FromStr;
use std::sync::{Mutex, MutexGuard};

use cairo_lang_utils::ordered_hash_map::OrderedHashMap;
use cairo_lang_utils::require;
pub use parse_test_file::parse_test_file;

/// Returns the content of the relevant test file.
fn get_expected_contents(path: &Path) -> String {
    fs::read_to_string(path).unwrap_or_else(|_| panic!("Could not read file: '{path:?}'"))
}

/// Overrides the test file data.
fn set_contents(path: &Path, content: String) {
    fs::write(path, content).unwrap_or_else(|_| panic!("Could not write file: '{path:?}'"));
}

/// Compares content to examples content, or overrides it if the `CAIRO_FIX_TESTS` environment
/// value is set to `1`.
pub fn compare_contents_or_fix_with_path(path: &Path, content: String) {
    let is_fix_mode = std::env::var("CAIRO_FIX_TESTS") == Ok("1".into());
    if is_fix_mode {
        set_contents(path, content);
    } else {
        pretty_assertions::assert_eq!(content, get_expected_contents(path));
    }
}

/// Locks the given mutex, and prints an informative error on failure.
pub fn test_lock<'a, T: ?Sized + 'a>(m: &'a Mutex<T>) -> MutexGuard<'a, T> {
    match m.lock() {
        Ok(guard) => guard,
        // Allow other test to take the lock if it was poisoned by a thread that panicked.
        Err(poisoned) => poisoned.into_inner(),
    }
}

/// Returns an error string according to the extracted `ExpectDiagnostics`.
/// Returns None on success.
pub fn verify_diagnostics_expectation(
    args: &OrderedHashMap<String, String>,
    diagnostics: &str,
) -> Option<String> {
    let expect_diagnostics = args.get("expect_diagnostics")?;
    require(expect_diagnostics != "*")?;

    let expect_diagnostics = expect_diagnostics_input_input(expect_diagnostics);
    let has_diagnostics = !diagnostics.is_empty();
    // TODO(Gil): This is a bit of a hack, try and get the original diagnostics from the test.
    let has_errors = diagnostics.lines().any(|line| line.starts_with("error: "));
    match expect_diagnostics {
        ExpectDiagnostics::Any => {
            if !has_diagnostics {
                return Some(
                    "`expect_diagnostics` is true, but no diagnostics were generated.\n"
                        .to_string(),
                );
            }
        }
        ExpectDiagnostics::Warnings => {
            if !has_diagnostics {
                return Some(
                    "`expect_diagnostics` is 'warnings_only', but no diagnostics were generated.\n"
                        .to_string(),
                );
            } else if has_errors {
                return Some(
                    "`expect_diagnostics` is 'warnings_only', but errors were generated.\n"
                        .to_string(),
                );
            }
        }
        ExpectDiagnostics::None => {
            if has_diagnostics {
                return Some(
                    "`expect_diagnostics` is false, but diagnostics were generated:\n".to_string(),
                );
            }
        }
    };
    None
}

/// The expected diagnostics for a test.
enum ExpectDiagnostics {
    /// Any diagnostics (warnings or errors) are expected.
    Any,
    /// Only warnings are expected.
    Warnings,
    /// No diagnostics are expected.
    None,
}

/// Translates a string test input to bool ("false" -> false, "true" -> true). Panics if invalid.
/// Ignores case.
fn expect_diagnostics_input_input(input: &str) -> ExpectDiagnostics {
    let input = input.to_lowercase();
    match input.as_str() {
        "false" => ExpectDiagnostics::None,
        "true" => ExpectDiagnostics::Any,
        "warnings_only" => ExpectDiagnostics::Warnings,
        _ => panic!("Expected 'true', 'false' or 'warnings', actual: {input}"),
    }
}

/// Translates a string test input to bool ("false" -> false, "true" -> true). Panics if invalid.
/// Ignores case.
pub fn bool_input(input: &str) -> bool {
    let input = input.to_lowercase();
    bool::from_str(&input).unwrap_or_else(|_| panic!("Expected 'true' or 'false', actual: {input}"))
}

/// Parses a test input that may be a file input. If the input starts with ">>> file: " it reads the
/// file and returns the file path and content, otherwise, it returns the input and a default dummy
/// path.
pub fn get_direct_or_file_content(input: &str) -> (String, String) {
    if let Some(path) = input.strip_prefix(">>> file: ") {
        (
            path.to_string(),
            fs::read_to_string(path).unwrap_or_else(|_| panic!("Could not read file: '{path}'")),
        )
    } else {
        ("dummy_file.cairo".to_string(), input.to_string())
    }
}
cairo_lang_test_utils/lib.rs

cairo_lang_test_utils/
lib.rs
