testing-timezone

When running tests in the Cal.diy repository, use the `TZ=UTC` environment variable:

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When running tests in the Cal.diy repository, use the `TZ=UTC` environment variable:

Agent definition

testing-timezone.md

title: Timezone Handling in Tests
impact: HIGH
impactDescription: Timezone bugs are hard to reproduce without consistent test environments
tags: testing, timezone, consistency

Timezone Handling in Tests

Always Use TZ=UTC

When running tests in the Cal.diy repository, use the `TZ=UTC` environment variable:

TZ=UTC yarn test

This ensures consistent timezone handling and prevents timezone-related test failures that might occur when tests are run in different environments or by different developers with varying local timezone settings.

Why This Matters

Tests may pass locally but fail in CI (or vice versa)
Date/time assertions become unpredictable
Debugging timezone issues is time-consuming

Test Commands

# Unit tests
TZ=UTC yarn test

# Specific test file
TZ=UTC yarn vitest run path/to/file.test.ts

# E2E tests (already configured in yarn e2e)
PLAYWRIGHT_HEADLESS=1 yarn e2e

Read it on GitHub ↗

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