mattermost/e2e-tests/cypress/tests/integration/channels/performance/utils.js

// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

export const measurePerformance = (name, upperLimit, callback, reset, runs = 6) => {
    return cy.window().its('performance').then((performance) => {
        const durations = [];

        Cypress._.times(runs, (i) => {
            const markerNameA = `${name}_start_${i}`;
            const markerNameB = `${name}_end_${i}`;

            cy.wrap({mark: () => performance.mark(markerNameA)}).invoke('mark');
            callback().then(() => {
                performance.mark(markerNameB);

                performance.measure(`${name}_${i}`, markerNameA, markerNameB);
                const measure = performance.getEntriesByName(`${name}_${i}`)[0];
                durations.push(measure.duration);
            });

            reset();
        });

        const currentTime = Date.now();

        cy.log('loop finish').then(() => {
            const avgDuration = Math.round(durations.reduce((a, b) => a + b) / runs);
            cy.log(`[PERFORMANCE] ${name}: ${avgDuration}ms ${avgDuration <= upperLimit ? ' within upper limit' : ' outside upper limit'} of ${upperLimit}ms`);
            cy.writeFile(`./tests/integration/performance/logs/${name}_${currentTime}.json`, {name, date: currentTime, duration: avgDuration});
            assert.isAtMost(avgDuration, upperLimit);

            // Clean the marks
            performance.clearMarks();
            performance.clearMeasures();
        });
    });
};