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//! Module `time` contains everything related to the time measurement of unit tests
//! execution.
//! The purposes of this module:
//! - Check whether test is timed out.
//! - Provide helpers for `report-time` and `measure-time` options.
//! - Provide newtypes for executions times.
use std::env;
use std::fmt;
use std::str::FromStr;
use std::time::{Duration, Instant};
use super::types::{TestDesc, TestType};
pub const TEST_WARN_TIMEOUT_S: u64 = 60;
/// This small module contains constants used by `report-time` option.
/// Those constants values will be used if corresponding environment variables are not set.
///
/// To override values for unit-tests, use a constant `RUST_TEST_TIME_UNIT`,
/// To override values for integration tests, use a constant `RUST_TEST_TIME_INTEGRATION`,
/// To override values for doctests, use a constant `RUST_TEST_TIME_DOCTEST`.
///
/// Example of the expected format is `RUST_TEST_TIME_xxx=100,200`, where 100 means
/// warn time, and 200 means critical time.
pub mod time_constants {
use super::TEST_WARN_TIMEOUT_S;
use std::time::Duration;
/// Environment variable for overriding default threshold for unit-tests.
pub const UNIT_ENV_NAME: &str = "RUST_TEST_TIME_UNIT";
// Unit tests are supposed to be really quick.
pub const UNIT_WARN: Duration = Duration::from_millis(50);
pub const UNIT_CRITICAL: Duration = Duration::from_millis(100);
/// Environment variable for overriding default threshold for unit-tests.
pub const INTEGRATION_ENV_NAME: &str = "RUST_TEST_TIME_INTEGRATION";
// Integration tests may have a lot of work, so they can take longer to execute.
pub const INTEGRATION_WARN: Duration = Duration::from_millis(500);
pub const INTEGRATION_CRITICAL: Duration = Duration::from_millis(1000);
/// Environment variable for overriding default threshold for unit-tests.
pub const DOCTEST_ENV_NAME: &str = "RUST_TEST_TIME_DOCTEST";
// Doctests are similar to integration tests, because they can include a lot of
// initialization code.
pub const DOCTEST_WARN: Duration = INTEGRATION_WARN;
pub const DOCTEST_CRITICAL: Duration = INTEGRATION_CRITICAL;
// Do not suppose anything about unknown tests, base limits on the
// `TEST_WARN_TIMEOUT_S` constant.
pub const UNKNOWN_WARN: Duration = Duration::from_secs(TEST_WARN_TIMEOUT_S);
pub const UNKNOWN_CRITICAL: Duration = Duration::from_secs(TEST_WARN_TIMEOUT_S * 2);
}
/// Returns an `Instance` object denoting when the test should be considered
/// timed out.
pub fn get_default_test_timeout() -> Instant {
Instant::now() + Duration::from_secs(TEST_WARN_TIMEOUT_S)
}
/// The measured execution time of a unit test.
#[derive(Debug, Clone, PartialEq)]
pub struct TestExecTime(pub Duration);
impl fmt::Display for TestExecTime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:.3}s", self.0.as_secs_f64())
}
}
/// The measured execution time of the whole test suite.
#[derive(Debug, Clone, Default, PartialEq)]
pub struct TestSuiteExecTime(pub Duration);
impl fmt::Display for TestSuiteExecTime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:.2}s", self.0.as_secs_f64())
}
}
/// Structure denoting time limits for test execution.
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct TimeThreshold {
pub warn: Duration,
pub critical: Duration,
}
impl TimeThreshold {
/// Creates a new `TimeThreshold` instance with provided durations.
pub fn new(warn: Duration, critical: Duration) -> Self {
Self { warn, critical }
}
/// Attempts to create a `TimeThreshold` instance with values obtained
/// from the environment variable, and returns `None` if the variable
/// is not set.
/// Environment variable format is expected to match `\d+,\d+`.
///
/// # Panics
///
/// Panics if variable with provided name is set but contains inappropriate
/// value.
pub fn from_env_var(env_var_name: &str) -> Option<Self> {
let durations_str = env::var(env_var_name).ok()?;
let (warn_str, critical_str) = durations_str.split_once(',').unwrap_or_else(|| {
panic!(
"Duration variable {} expected to have 2 numbers separated by comma, but got {}",
env_var_name, durations_str
)
});
let parse_u64 = |v| {
u64::from_str(v).unwrap_or_else(|_| {
panic!(
"Duration value in variable {} is expected to be a number, but got {}",
env_var_name, v
)
})
};
let warn = parse_u64(warn_str);
let critical = parse_u64(critical_str);
if warn > critical {
panic!("Test execution warn time should be less or equal to the critical time");
}
Some(Self::new(Duration::from_millis(warn), Duration::from_millis(critical)))
}
}
/// Structure with parameters for calculating test execution time.
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq)]
pub struct TestTimeOptions {
/// Denotes if the test critical execution time limit excess should be considered
/// a test failure.
pub error_on_excess: bool,
pub unit_threshold: TimeThreshold,
pub integration_threshold: TimeThreshold,
pub doctest_threshold: TimeThreshold,
}
impl TestTimeOptions {
pub fn new_from_env(error_on_excess: bool) -> Self {
let unit_threshold = TimeThreshold::from_env_var(time_constants::UNIT_ENV_NAME)
.unwrap_or_else(Self::default_unit);
let integration_threshold =
TimeThreshold::from_env_var(time_constants::INTEGRATION_ENV_NAME)
.unwrap_or_else(Self::default_integration);
let doctest_threshold = TimeThreshold::from_env_var(time_constants::DOCTEST_ENV_NAME)
.unwrap_or_else(Self::default_doctest);
Self { error_on_excess, unit_threshold, integration_threshold, doctest_threshold }
}
pub fn is_warn(&self, test: &TestDesc, exec_time: &TestExecTime) -> bool {
exec_time.0 >= self.warn_time(test)
}
pub fn is_critical(&self, test: &TestDesc, exec_time: &TestExecTime) -> bool {
exec_time.0 >= self.critical_time(test)
}
fn warn_time(&self, test: &TestDesc) -> Duration {
match test.test_type {
TestType::UnitTest => self.unit_threshold.warn,
TestType::IntegrationTest => self.integration_threshold.warn,
TestType::DocTest => self.doctest_threshold.warn,
TestType::Unknown => time_constants::UNKNOWN_WARN,
}
}
fn critical_time(&self, test: &TestDesc) -> Duration {
match test.test_type {
TestType::UnitTest => self.unit_threshold.critical,
TestType::IntegrationTest => self.integration_threshold.critical,
TestType::DocTest => self.doctest_threshold.critical,
TestType::Unknown => time_constants::UNKNOWN_CRITICAL,
}
}
fn default_unit() -> TimeThreshold {
TimeThreshold::new(time_constants::UNIT_WARN, time_constants::UNIT_CRITICAL)
}
fn default_integration() -> TimeThreshold {
TimeThreshold::new(time_constants::INTEGRATION_WARN, time_constants::INTEGRATION_CRITICAL)
}
fn default_doctest() -> TimeThreshold {
TimeThreshold::new(time_constants::DOCTEST_WARN, time_constants::DOCTEST_CRITICAL)
}
}
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