atmos stack test

Run the tests supported by each selected component kind in dependency order. Terraform components use the existing atmos terraform test command.

atmos stack test --help

Usage

atmos stack test --stack=dev [--component=network,app]
atmos stack test --all
atmos stack test --affected --base=origin/main

With --stack=dev, Atmos selects every eligible component in that stack. Use --component=network,app, repeated --component flags, or both to narrow the selection. Names match across component kinds and duplicate names run once per kind and stack. Positional component arguments are not accepted. Unknown names are errors.

Without --stack, --all, or --affected, Atmos prompts for a stack that has at least one enabled, unlocked, non-abstract component supporting the requested operation. Bare --component opens a multiselect picker; explicit names supplied alongside it start selected. Cancellation or an empty component selection stops before execution. Both prompts work during --dry-run. In CI, without an interactive terminal, or with --interactive=false, supply explicit values instead.

Examples

# Test two named components in dev.
atmos stack test --stack=dev --component=network --component=app

# Choose components and inspect their commands and hooks without running them.
atmos stack test --stack=dev --component --dry-run

# Test changed components and their prerequisites.
atmos stack test --affected --base=origin/main --include-dependencies

# Run independent tests concurrently and continue independent branches on failure.
atmos stack test --stack=dev --max-concurrency=2 --failure-mode=keep-going

Supported component kinds

• Terraform runs atmos terraform test, including its native before.terraform.test and after.terraform.test hooks.
• Custom component kinds participate when a custom command named test declares component.type and supplies component and stack bindings. Custom kinds work with stack selection, --component, --all, and dependency expansion; affected detection does not yet select custom kinds.

Kinds without a registered test handler are excluded with a notice. Selecting only unsupported kinds succeeds with an explicit no-match message; it does not substitute a different operation. Unselected prerequisites do not need a test handler: a Terraform component can depend on an already deployed Helmfile component without testing that prerequisite. Explicit dependency expansion fails before execution when a required prerequisite within the requested depth has no test handler. Optional unsupported prerequisites are omitted.

stack test does not implicitly build or deploy components. Terraform test files determine whether tests plan resources or create and clean up temporary resources, just as with atmos terraform test. Use --dry-run to preview the selected commands and hook declarations without executing tests or hooks. Use the native component command when you need Terraform-specific test flags.

Execution and results

Tests run in dependency order. Unselected prerequisites do not run unless included with --include-dependencies; expansion can cross stacks and component names. With fail-fast, a failed test stops pending operations. With keep-going, independent branches continue while dependents of the failed test are skipped. Failures return a nonzero exit status. The final tally reports succeeded, failed, skipped, and excluded components.

Each component runs in an isolated Atmos process, preserving native hooks and authentication. Terraform components sharing a source directory are serialized, and concurrent workers disable the shared plugin cache. One worker preserves interactive input; concurrent workers require a noninteractive identity. Terraform test does not require --auto-approve for concurrent execution.

CI mode collects child test summaries and outputs into the combined stack report. It uses the same CI output fields and configuration as the other stack lifecycle operations. Dry runs do not publish execution results. Deleted affected definitions are reported and omitted because their tests are no longer available in the current configuration; testing never invokes teardown.

Before execution, Atmos checks named identities and component authentication defaults across the selected components. An undefined identity stops the operation before any component starts and includes matching profile suggestions when available. This check does not log in; credential acquisition remains with each component command. Dry runs and --identity=false bypass this authentication check.

Skipped status lines include the reason, such as fail-fast after terraform/dev/vpc failed, dependency terraform/dev/vpc failed, or context canceled.

Flags

--component[=names]

Filter by exact component names across kinds. Repeat the flag or comma-separate names; matching any supplied name is sufficient. With no value, open a multiselect picker. Supplied names start selected when combined with a bare flag. Empty names and empty picker selections are errors. Omit the flag to select every eligible component in the chosen scope. Dependency expansion can add other names.

--all

Select every component that defines a test operation. May be narrowed by component names, stack, tags, or labels. Cannot combine --all and --affected. Default: false.

--affected

Select components affected by the Git comparison. May be narrowed by component names, stack, tags, or labels. Cannot combine --all and --affected. Default: false.

--tags

Select components whose metadata.tags include any of the given tags (comma-separated). Selects matching components in a supplied or prompted stack. With component names, --all, or --affected, it narrows that selection. Dependency expansion still follows declared dependencies regardless of tags. Environment variable: ATMOS_TAGS. Default: No tag filter.

--labels

Select components whose metadata.labels contain every given key=value (or key:value) pair. Repeat the flag or separate pairs with commas. Used alone or combined like --tags; when both are given, a component must match both. Environment variable: ATMOS_LABELS. Default: No label filter.

--stack, -s

Intersect the initial selection with a canonical stack name. A name that matches no stack is an error. Environment variable: ATMOS_STACK. Without --all or --affected, a missing stack is prompted interactively or reported as an error. With either bulk flag, omitting this selects across stacks.

--base

Base Git ref or SHA for the comparison. Atmos detects it automatically in supported CI environments. Requires --affected. Default: Existing affected baseline rules.

--ref

Git reference to compare against. Requires --affected.

--sha

Git SHA to compare against. Requires --affected.

--repo-path

Existing repository to use as the comparison baseline. Requires --affected; cannot be combined with --base, --ref, --sha, --ssh-key, --ssh-key-password, or --clone-target-ref.

--ssh-key

SSH key for cloning the comparison baseline. Requires --affected.

--ssh-key-password

Password for the SSH key. Requires --affected.

--clone-target-ref

Clone the comparison baseline. Requires --affected. Default: false.

--include-dependencies[=N]

Include prerequisites of the selected components. The bare flag expands without a depth limit; use the =N form, such as --include-dependencies=2, to limit the depth. Default: Disabled.

--include-dependents[=N]

Include consumers of the selected components. The bare flag expands without a depth limit; use the =N form to limit the depth. Default: Disabled.

--max-concurrency

Maximum number of active component operations. One worker permits interactive prompts. Default: 1.

--failure-mode

fail-fast stops at the first failure. keep-going finishes independent branches while dependents of failures are skipped. Default: fail-fast.

--log-order

stream prints component output as it arrives. grouped emits complete component logs in stable dependency order and applies when --max-concurrency is greater than 1. Grouped mode shows live start and completion messages on stderr while buffering child logs. It sends each component's stdout to stdout and its headers and stderr to stderr. Default: stream.

--dry-run

Preview selection, commands, relationships, and lifecycle hooks without running tests or hooks. Environment variable: ATMOS_DRY_RUN. Default: false.

--identity, -i

Forward the identity to each child. Use --identity without a value to select interactively, which requires --max-concurrency=1. Environment variable: ATMOS_IDENTITY. Default: Component command behavior.

--auto-approve

Append each handler's registered approval arguments. The Terraform test handler does not register approval arguments, so this flag adds nothing to its command. Default: false.

--ci

Run in CI mode. Every child component command runs with ATMOS_CI=true, and Atmos publishes one combined job summary and one set of outputs for the whole run. Without the flag, CI mode turns on when ATMOS_CI or CI is truthy or a CI provider is detected; an explicit --ci=false turns it off. Environment variables: ATMOS_CI, CI. Default: false.

--skip-hooks[=names]

Skip all hooks, or the comma-separated hook names; previews identify skipped hooks. Environment variable: ATMOS_SKIP_HOOKS.

Comparison flags (--base, --ref, --sha, --repo-path, --ssh-key, --ssh-key-password, and --clone-target-ref) require --affected and are rejected otherwise. Only the environment variables listed above apply to this command. Variables that other commands bind to similar settings, such as ATMOS_TERRAFORM_DESTROY_ALL, do not change the selection.