Struct MetricsAssert 

pub struct MetricsAssert<T> { /* private fields */ }

Provides fluent test assertions for metrics.

Examples

use ic_metrics_assert::{MetricsAssert, PocketIcHttpQuery};
use pocket_ic::PocketIc;
use ic_management_canister_types::CanisterId;

struct Setup {
    env: PocketIc,
    canister_id : CanisterId,
}

impl Setup {
    pub fn check_metrics(self) -> MetricsAssert<Self> {
        MetricsAssert::from_http_query(self)
    }
}

impl PocketIcHttpQuery for Setup {
    fn get_pocket_ic(&self) -> &PocketIc {
        &self.env
    }

    fn get_canister_id(&self) -> CanisterId {
        self.canister_id
    }
}

fn assert_metrics () {
    use pocket_ic::PocketIcBuilder;
    use candid::Principal;

    let env = PocketIcBuilder::new().build();
    let canister_id = Principal::from_text("7hfb6-caaaa-aaaar-qadga-cai").unwrap();
    let setup = Setup {env, canister_id};

    setup
        .check_metrics()
        .assert_contains_metric_matching("started action \\d+")
        .assert_contains_metric_matching("completed action 1")
        .assert_does_not_contain_metric_matching(".*trap.*");
}

Implementations

impl<T> MetricsAssert<T>

pub fn from_http_query<E>(actual: T) -> Self

where T: CanisterHttpQuery<E>, E: Debug,

Initializes an instance of MetricsAssert by querying the metrics from the /metrics endpoint of a canister via the CanisterHttpQuery::http_query method.

pub async fn from_async_http_query<E>(actual: T) -> Self

where T: AsyncCanisterHttpQuery<E>, E: Debug,

Initializes an instance of MetricsAssert by querying the metrics from the /metrics endpoint of a canister via the AsyncCanisterHttpQuery::http_query method.

pub fn into(self) -> T

Returns the internal instance being tested.

pub fn assert_contains_metric_matching<P: AsRef<str> + Display>( self, pattern: P, ) -> Self

Asserts that the metrics contain at least one entry matching the given Regex pattern.

pub fn assert_does_not_contain_metric_matching(self, pattern: &str) -> Self

Asserts that the metrics do not contain any entries matching the given Regex pattern.