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deno test

Command-line Usage

deno test [OPTIONS] [files]... [-- [SCRIPT_ARG]...]

Run tests using Deno's built-in test runner.

Evaluate the given modules, run all tests declared with Deno.test() and report results to standard output:

deno test src/fetch_test.ts src/signal_test.ts

Directory arguments are expanded to all contained files matching the glob {*_,*.,}test.{js,mjs,ts,mts,jsx,tsx} or **/__tests__/**:

deno test src/

Type checking options Jump to heading

--check Jump to heading

Set type-checking behavior. This subcommand type-checks local modules by default, so adding --check is redundant If the value of "all" is supplied, remote modules will be included. Alternatively, the 'deno check' subcommand can be used.

--no-check Jump to heading

Skip type-checking. If the value of "remote" is supplied, diagnostic errors from remote modules will be ignored.

Dependency management options Jump to heading

--cached-only Jump to heading

Require that remote dependencies are already cached.

--frozen Jump to heading

Error out if lockfile is out of date.

--import-map Jump to heading

Load import map file from local file or remote URL.

--lock Jump to heading

Check the specified lock file. (If value is not provided, defaults to "./deno.lock").

--no-lock Jump to heading

Disable auto discovery of the lock file.

--no-npm Jump to heading

Do not resolve npm modules.

--no-remote Jump to heading

Do not resolve remote modules.

--node-modules-dir Jump to heading

Sets the node modules management mode for npm packages.

--reload Jump to heading

Short flag: -r

Reload source code cache (recompile TypeScript) no value Reload everything jsr:@std/http/file-server,jsr:@std/assert/assert-equals Reloads specific modules npm: Reload all npm modules npm:chalk Reload specific npm module.

--vendor Jump to heading

Toggles local vendor folder usage for remote modules and a node_modules folder for npm packages.

Options Jump to heading

--cert Jump to heading

Load certificate authority from PEM encoded file.

--config Jump to heading

Short flag: -c

Configure different aspects of deno including TypeScript, linting, and code formatting Typically the configuration file will be called deno.json or deno.jsonc and automatically detected; in that case this flag is not necessary.

--env-file Jump to heading

Load environment variables from local file Only the first environment variable with a given key is used. Existing process environment variables are not overwritten.

--ext Jump to heading

Set content type of the supplied file.

--hide-stacktraces Jump to heading

Hide stack traces for errors in failure test results.

--ignore Jump to heading

Ignore files.

--location Jump to heading

Value of globalThis.location used by some web APIs.

--no-config Jump to heading

Disable automatic loading of the configuration file.

--parallel Jump to heading

Run test modules in parallel. Parallelism defaults to the number of available CPUs or the value of the DENO_JOBS environment variable.

--seed Jump to heading

Set the random number generator seed.

--v8-flags Jump to heading

To see a list of all available flags use --v8-flags=--help Flags can also be set via the DENO_V8_FLAGS environment variable. Any flags set with this flag are appended after the DENO_V8_FLAGS environment variable.

Debugging options Jump to heading

--inspect Jump to heading

Activate inspector on host:port [default: 127.0.0.1:9229]

--inspect-brk Jump to heading

Activate inspector on host:port, wait for debugger to connect and break at the start of user script.

--inspect-wait Jump to heading

Activate inspector on host:port and wait for debugger to connect before running user code.

Testing options Jump to heading

--clean Jump to heading

Empty the temporary coverage profile data directory before running tests. Note: running multiple deno test --clean`` calls in series or parallel for the same coverage directory may cause race conditions.

--coverage Jump to heading

Collect coverage profile data into DIR. If DIR is not specified, it uses 'coverage/'.

--doc Jump to heading

Evaluate code blocks in JSDoc and Markdown.

--fail-fast Jump to heading

Stop after N errors. Defaults to stopping after first failure.

--filter Jump to heading

Run tests with this string or regexp pattern in the test name.

--junit-path Jump to heading

Write a JUnit XML test report to PATH. Use '-' to write to stdout which is the default when PATH is not provided.

--no-run Jump to heading

Cache test modules, but don't run tests.

--permit-no-files Jump to heading

Don't return an error code if no test files were found.

--reporter Jump to heading

Select reporter to use. Default to 'pretty'.

--shuffle Jump to heading

Shuffle the order in which the tests are run.

--trace-leaks Jump to heading

Enable tracing of leaks. Useful when debugging leaking ops in test, but impacts test execution time.

File watching options Jump to heading

--no-clear-screen Jump to heading

Do not clear terminal screen when under watch mode.

--watch Jump to heading

Watch for file changes and restart process automatically. Local files from entry point module graph are watched by default. Additional paths might be watched by passing them as arguments to this flag.

--watch-exclude Jump to heading

Exclude provided files/patterns from watch mode.

Additional information Jump to heading

It can be executed in watch mode (--watch), supports parallel execution (--parallel), and can be configured to run tests in a random order with (--shuffle). Additionally, there is built in support for code coverage (--coverage) and leak detection (--trace-leaks).

Examples Jump to heading

Run tests

deno test

Run tests in specific files

deno test src/fetch_test.ts src/signal_test.ts

Run tests where glob matches

deno test src/*.test.ts

Run tests and skip type-checking

deno test --no-check

Run tests, re-running on file change

deno test --watch