Deno

Test Commands

Run tests with Deno's built-in test runner. Filter tests, generate coverage reports, and use assertions from the standard library.

8 commands

Pro Tips

Use '--filter' to run specific tests by name pattern.

Add '--coverage' to generate code coverage reports.

Use '--watch' to re-run tests automatically on file changes.

Common Mistakes

Tests need permissions too - use '--allow-*' flags as needed.

Sanitizers (resource/op) can catch async leaks - don't disable without reason.

Commands

Coverage Report

$ deno coverage coverage --html

Generate HTML coverage report

Run Tests

$ deno test

Execute all tests in project

Test with Coverage

$ deno test --coverage=coverage

Generate coverage data

Fail Fast

$ deno test --fail-fast

Stop on first test failure

Test Specific File

$ deno test tests/my_test.ts

Run tests in a specific file

Filter Tests

$ deno test --filter "test name"

Run tests matching pattern

Parallel Tests

$ deno test --parallel

Run tests in parallel

Watch Tests

$ deno test --watch

Re-run tests on file changes