Vitest

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Command Line Interface ​

Commands ​

vitest ​

Start Vitest in the current directory. Will enter the watch mode in development environment and run mode in CI automatically.

You can pass an additional argument as the filter of the test files to run. For example:

bash
vitest foobar

Will run only the test file that contains foobar in their paths. This filter only checks inclusion and doesn't support regexp or glob patterns (unless your terminal processes it before Vitest receives the filter).

vitest run ​

Perform a single run without watch mode.

vitest watch ​

Run all test suites but watch for changes and rerun tests when they change. Same as calling vitest without an argument. Will fallback to vitest run in CI.

vitest dev ​

Alias to vitest watch.

Run only tests that cover a list of source files. Works with static imports (e.g., import('./index.js') or import index from './index.js), but not the dynamic ones (e.g., import(filepath)). All files should be relative to root folder.

Useful to run with lint-staged or with your CI setup.

bash
vitest related /src/index.ts /src/hello-world.js

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Don't forget that Vitest runs with enabled watch mode by default. If you are using tools like lint-staged, you should also pass --run option, so that command can exit normally.

js
// .lintstagedrc.js
export default {
  '*.{js,ts}': 'vitest related --run',
}

vitest bench ​

Run only benchmark tests, which compare performance results.

vitest init ​

vitest init <name> can be used to setup project configuration. At the moment, it only supports browser value:

bash
vitest init browser

vitest list ​

vitest list command inherits all vitest options to print the list of all matching tests. This command ignores reporters option. By default, it will print the names of all tests that matched the file filter and name pattern:

shell
vitest list filename.spec.ts -t="some-test"
txt
describe > some-test
describe > some-test > test 1
describe > some-test > test 2

You can pass down --json flag to print tests in JSON format or save it in a separate file:

bash
vitest list filename.spec.ts -t="some-test" --json=./file.json

If --json flag doesn't receive a value, it will output the JSON into stdout.

You also can pass down --filesOnly flag to print the test files only:

bash
vitest list --filesOnly
txt
tests/test1.test.ts
tests/test2.test.ts

Options ​

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Vitest supports both camel case and kebab case for CLI arguments. For example, --passWithNoTests and --pass-with-no-tests will both work (--no-color and --inspect-brk are the exceptions).

Vitest also supports different ways of specifying the value: --reporter dot and --reporter=dot are both valid.

If option supports an array of values, you need to pass the option multiple times:

vitest --reporter=dot --reporter=default

Boolean options can be negated with no- prefix. Specifying the value as false also works:

vitest --no-api
vitest --api=false

root ​

  • CLI: -r, --root <path>
  • Config: root

Root path

config ​

  • CLI: -c, --config <path>

Path to config file

update ​

  • CLI: -u, --update
  • Config: update

Update snapshot

watch ​

  • CLI: -w, --watch
  • Config: watch

Enable watch mode

testNamePattern ​

Run tests with full names matching the specified regexp pattern

dir ​

  • CLI: --dir <path>
  • Config: dir

Base directory to scan for the test files

ui ​

  • CLI: --ui
  • Config: ui

Enable UI

open ​

  • CLI: --open
  • Config: open

Open UI automatically (default: !process.env.CI)

api.port ​

  • CLI: --api.port [port]

Specify server port. Note if the port is already being used, Vite will automatically try the next available port so this may not be the actual port the server ends up listening on. If true will be set to 51204

api.host ​

  • CLI: --api.host [host]

Specify which IP addresses the server should listen on. Set this to 0.0.0.0 or true to listen on all addresses, including LAN and public addresses

api.strictPort ​

  • CLI: --api.strictPort

Set to true to exit if port is already in use, instead of automatically trying the next available port

silent ​

Silent console output from tests

hideSkippedTests ​

  • CLI: --hideSkippedTests

Hide logs for skipped tests

reporters ​

Specify reporters

outputFile ​

Write test results to a file when supporter reporter is also specified, use cac's dot notation for individual outputs of multiple reporters (example: --outputFile.tap=./tap.txt)

coverage.all ​

Whether to include all files, including the untested ones into report

coverage.provider ​

Select the tool for coverage collection, available values are: "v8", "istanbul" and "custom"

coverage.enabled ​

Enables coverage collection. Can be overridden using the --coverage CLI option (default: false)

coverage.include ​

Files included in coverage as glob patterns. May be specified more than once when using multiple patterns (default: **)

coverage.exclude ​

Files to be excluded in coverage. May be specified more than once when using multiple extensions (default: Visit coverage.exclude)

coverage.extension ​

Extension to be included in coverage. May be specified more than once when using multiple extensions (default: [".js", ".cjs", ".mjs", ".ts", ".mts", ".tsx", ".jsx", ".vue", ".svelte"])

coverage.clean ​

Clean coverage results before running tests (default: true)

coverage.cleanOnRerun ​

Clean coverage report on watch rerun (default: true)

coverage.reportsDirectory ​

Directory to write coverage report to (default: ./coverage)

coverage.reporter ​

Coverage reporters to use. Visit coverage.reporter for more information (default: ["text", "html", "clover", "json"])

coverage.reportOnFailure ​

Generate coverage report even when tests fail (default: false)

coverage.allowExternal ​

Collect coverage of files outside the project root (default: false)

coverage.skipFull ​

Do not show files with 100% statement, branch, and function coverage (default: false)

coverage.thresholds.100 ​

Shortcut to set all coverage thresholds to 100 (default: false)

coverage.thresholds.perFile ​

Check thresholds per file. See --coverage.thresholds.lines, --coverage.thresholds.functions, --coverage.thresholds.branches and --coverage.thresholds.statements for the actual thresholds (default: false)

coverage.thresholds.autoUpdate ​

Update threshold values: "lines", "functions", "branches" and "statements" to configuration file when current coverage is above the configured thresholds (default: false)

coverage.thresholds.lines ​

  • CLI: --coverage.thresholds.lines <number>

Threshold for lines. Visit istanbuljs for more information. This option is not available for custom providers

coverage.thresholds.functions ​

  • CLI: --coverage.thresholds.functions <number>

Threshold for functions. Visit istanbuljs for more information. This option is not available for custom providers

coverage.thresholds.branches ​

  • CLI: --coverage.thresholds.branches <number>

Threshold for branches. Visit istanbuljs for more information. This option is not available for custom providers

coverage.thresholds.statements ​

  • CLI: --coverage.thresholds.statements <number>

Threshold for statements. Visit istanbuljs for more information. This option is not available for custom providers

coverage.ignoreClassMethods ​

Array of class method names to ignore for coverage. Visit istanbuljs for more information. This option is only available for the istanbul providers (default: [])

coverage.processingConcurrency ​

Concurrency limit used when processing the coverage results. (default min between 20 and the number of CPUs)

coverage.customProviderModule ​

Specifies the module name or path for the custom coverage provider module. Visit Custom Coverage Provider for more information. This option is only available for custom providers

coverage.watermarks.statements ​

  • CLI: --coverage.watermarks.statements <watermarks>

High and low watermarks for statements in the format of <high>,<low>

coverage.watermarks.lines ​

  • CLI: --coverage.watermarks.lines <watermarks>

High and low watermarks for lines in the format of <high>,<low>

coverage.watermarks.branches ​

  • CLI: --coverage.watermarks.branches <watermarks>

High and low watermarks for branches in the format of <high>,<low>

coverage.watermarks.functions ​

  • CLI: --coverage.watermarks.functions <watermarks>

High and low watermarks for functions in the format of <high>,<low>

mode ​

  • CLI: --mode <name>
  • Config: mode

Override Vite mode (default: test or benchmark)

workspace ​

Path to a workspace configuration file

isolate ​

Run every test file in isolation. To disable isolation, use --no-isolate (default: true)

globals ​

Inject apis globally

dom ​

  • CLI: --dom

Mock browser API with happy-dom

browser.enabled ​

Run tests in the browser. Equivalent to --browser.enabled (default: false)

browser.name ​

Run all tests in a specific browser. Some browsers are only available for specific providers (see --browser.provider). Visit browser.name for more information

browser.headless ​

Run the browser in headless mode (i.e. without opening the GUI (Graphical User Interface)). If you are running Vitest in CI, it will be enabled by default (default: process.env.CI)

browser.api.port ​

Specify server port. Note if the port is already being used, Vite will automatically try the next available port so this may not be the actual port the server ends up listening on. If true will be set to 63315

browser.api.host ​

Specify which IP addresses the server should listen on. Set this to 0.0.0.0 or true to listen on all addresses, including LAN and public addresses

browser.api.strictPort ​

Set to true to exit if port is already in use, instead of automatically trying the next available port

browser.provider ​

Provider used to run browser tests. Some browsers are only available for specific providers. Can be "webdriverio", "playwright", "preview", or the path to a custom provider. Visit browser.provider for more information (default: "preview")

browser.providerOptions ​

Options that are passed down to a browser provider. Visit browser.providerOptions for more information

browser.isolate ​

Run every browser test file in isolation. To disable isolation, use --browser.isolate=false (default: true)

browser.ui ​

Show Vitest UI when running tests (default: !process.env.CI)

browser.fileParallelism ​

Should browser test files run in parallel. Use --browser.fileParallelism=false to disable (default: true)

pool ​

  • CLI: --pool <pool>
  • Config: pool

Specify pool, if not running in the browser (default: threads)

poolOptions.threads.isolate ​

Isolate tests in threads pool (default: true)

poolOptions.threads.singleThread ​

Run tests inside a single thread (default: false)

poolOptions.threads.maxThreads ​

Maximum number or percentage of threads to run tests in

poolOptions.threads.minThreads ​

Minimum number or percentage of threads to run tests in

poolOptions.threads.useAtomics ​

Use Atomics to synchronize threads. This can improve performance in some cases, but might cause segfault in older Node versions (default: false)

poolOptions.vmThreads.isolate ​

Isolate tests in threads pool (default: true)

poolOptions.vmThreads.singleThread ​

Run tests inside a single thread (default: false)

poolOptions.vmThreads.maxThreads ​

Maximum number or percentage of threads to run tests in

poolOptions.vmThreads.minThreads ​

Minimum number or percentage of threads to run tests in

poolOptions.vmThreads.useAtomics ​

Use Atomics to synchronize threads. This can improve performance in some cases, but might cause segfault in older Node versions (default: false)

poolOptions.vmThreads.memoryLimit ​

Memory limit for VM threads pool. If you see memory leaks, try to tinker this value.

poolOptions.forks.isolate ​

Isolate tests in forks pool (default: true)

poolOptions.forks.singleFork ​

Run tests inside a single child_process (default: false)

poolOptions.forks.maxForks ​

Maximum number or percentage of processes to run tests in

poolOptions.forks.minForks ​

Minimum number or percentage of processes to run tests in

poolOptions.vmForks.isolate ​

Isolate tests in forks pool (default: true)

poolOptions.vmForks.singleFork ​

Run tests inside a single child_process (default: false)

poolOptions.vmForks.maxForks ​

Maximum number or percentage of processes to run tests in

poolOptions.vmForks.minForks ​

Minimum number or percentage of processes to run tests in

poolOptions.vmForks.memoryLimit ​

Memory limit for VM forks pool. If you see memory leaks, try to tinker this value.

fileParallelism ​

Should all test files run in parallel. Use --no-file-parallelism to disable (default: true)

maxWorkers ​

Maximum number or percentage of workers to run tests in

minWorkers ​

Minimum number or percentage of workers to run tests in

environment ​

Specify runner environment, if not running in the browser (default: node)

passWithNoTests ​

Pass when no tests are found

logHeapUsage ​

Show the size of heap for each test when running in node

allowOnly ​

Allow tests and suites that are marked as only (default: !process.env.CI)

dangerouslyIgnoreUnhandledErrors ​

Ignore any unhandled errors that occur

sequence.shuffle.files ​

Run files in a random order. Long running tests will not start earlier if you enable this option. (default: false)

sequence.shuffle.tests ​

Run tests in a random order (default: false)

sequence.concurrent ​

Make tests run in parallel (default: false)

sequence.seed ​

Set the randomization seed. This option will have no effect if --sequence.shuffle is falsy. Visit "Random Seed" page for more information

sequence.hooks ​

Changes the order in which hooks are executed. Accepted values are: "stack", "list" and "parallel". Visit sequence.hooks for more information (default: "parallel")

sequence.setupFiles ​

Changes the order in which setup files are executed. Accepted values are: "list" and "parallel". If set to "list", will run setup files in the order they are defined. If set to "parallel", will run setup files in parallel (default: "parallel")

inspect ​

  • CLI: --inspect [[host:]port]
  • Config: inspect

Enable Node.js inspector (default: 127.0.0.1:9229)

inspectBrk ​

Enable Node.js inspector and break before the test starts

testTimeout ​

Default timeout of a test in milliseconds (default: 5000)

hookTimeout ​

Default hook timeout in milliseconds (default: 10000)

bail ​

  • CLI: --bail <number>
  • Config: bail

Stop test execution when given number of tests have failed (default: 0)

retry ​

  • CLI: --retry <times>
  • Config: retry

Retry the test specific number of times if it fails (default: 0)

diff.aAnnotation ​

Annotation for expected lines (default: Expected)

diff.aIndicator ​

Indicator for expected lines (default: -)

diff.bAnnotation ​

Annotation for received lines (default: Received)

diff.bIndicator ​

Indicator for received lines (default: +)

diff.commonIndicator ​

Indicator for common lines (default: )

diff.contextLines ​

Number of lines of context to show around each change (default: 5)

diff.emptyFirstOrLastLinePlaceholder ​

Placeholder for an empty first or last line (default: "")

diff.expand ​

Expand all common lines (default: true)

diff.includeChangeCounts ​

Include comparison counts in diff output (default: false)

diff.omitAnnotationLines ​

Omit annotation lines from the output (default: false)

diff.printBasicPrototype ​

Print basic prototype Object and Array (default: true)

diff.truncateThreshold ​

Number of lines to show before and after each change (default: 0)

diff.truncateAnnotation ​

Annotation for truncated lines (default: ... Diff result is truncated)

exclude ​

  • CLI: --exclude <glob>
  • Config: exclude

Additional file globs to be excluded from test

expandSnapshotDiff ​

Show full diff when snapshot fails

disableConsoleIntercept ​

Disable automatic interception of console logging (default: false)

typecheck.enabled ​

Enable typechecking alongside tests (default: false)

typecheck.only ​

Run only typecheck tests. This automatically enables typecheck (default: false)

typecheck.checker ​

Specify the typechecker to use. Available values are: "tsc" and "vue-tsc" and a path to an executable (default: "tsc")

typecheck.allowJs ​

Allow JavaScript files to be typechecked. By default takes the value from tsconfig.json

typecheck.ignoreSourceErrors ​

Ignore type errors from source files

typecheck.tsconfig ​

Path to a custom tsconfig file

attest ​

Enable runtime type assertions (default: false)

project ​

  • CLI: --project <name>
  • Config: project

The name of the project to run if you are using Vitest workspace feature. This can be repeated for multiple projects: --project=1 --project=2. You can also filter projects using wildcards like --project=packages*, and exclude projects with --project=!pattern.

slowTestThreshold ​

Threshold in milliseconds for a test or suite to be considered slow (default: 300)

teardownTimeout ​

Default timeout of a teardown function in milliseconds (default: 10000)

maxConcurrency ​

Maximum number of concurrent tests in a suite (default: 5)

expect.requireAssertions ​

Require that all tests have at least one assertion

expect.poll.interval ​

Poll interval in milliseconds for expect.poll() assertions (default: 50)

expect.poll.timeout ​

Poll timeout in milliseconds for expect.poll() assertions (default: 1000)

printConsoleTrace ​

Always print console stack traces

run ​

  • CLI: --run

Disable watch mode

color ​

  • CLI: --no-color

Removes colors from the console output

clearScreen ​

  • CLI: --clearScreen

Clear terminal screen when re-running tests during watch mode (default: true)

standalone ​

  • CLI: --standalone

Start Vitest without running tests. File filters will be ignored, tests will be running only on change (default: false)

changed ​

  • Type: boolean | string
  • Default: false

Run tests only against changed files. If no value is provided, it will run tests against uncommitted changes (including staged and unstaged).

To run tests against changes made in the last commit, you can use --changed HEAD~1. You can also pass commit hash (e.g. --changed 09a9920) or branch name (e.g. --changed origin/develop).

When used with code coverage the report will contain only the files that were related to the changes.

If paired with the forceRerunTriggers config option it will run the whole test suite if at least one of the files listed in the forceRerunTriggers list changes. By default, changes to the Vitest config file and package.json will always rerun the whole suite.

shard ​

  • Type: string
  • Default: disabled

Test suite shard to execute in a format of <index>/<count>, where

  • count is a positive integer, count of divided parts
  • index is a positive integer, index of divided part

This command will divide all tests into count equal parts, and will run only those that happen to be in an index part. For example, to split your tests suite into three parts, use this:

sh
vitest run --shard=1/3
vitest run --shard=2/3
vitest run --shard=3/3

WARNING

You cannot use this option with --watch enabled (enabled in dev by default).

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If --reporter=blob is used without an output file, the default path will include the current shard config to avoid collisions with other Vitest processes.

merge-reports ​

  • Type: boolean | string

Merges every blob report located in the specified folder (.vitest-reports by default). You can use any reporters with this command (except blob):

sh
vitest --merge-reports --reporter=junit

Released under the MIT License.

Copyright © 2021-PRESENT Anthony Fu, Matías Capeletto and Vitest contributors