---
id: TST-PFM-NOT-106
title: collapsing
kind: unit
product_area: platform
module: notifications
revision: 1
status: draft
source_sha:
  services-platform: ad3f6a6582843008ed0f5a17b131878d15829af1
repository: services-platform
files:
  - modules/notifications/tests/unit/collapsing.spec.js
implements:
  - ATS-PFM-NOT-005-01
  - ATS-PFM-NOT-005-04
environment: mock
implementation_state: implemented
latest_result: not-run
latest_run_at: null
latest_run_ref: null
conformance: not-verified
estimated_minutes: 1
isolation: Per-process test inputs and installed doubles.
assertion_bindings:
  - scenario: ATS-PFM-NOT-005-01
    suite: TST-PFM-NOT-106
    assertions:
      - >-
        services-platform:modules/notifications/tests/unit/collapsing.spec.js#takes
        in an instance created within the definition’s window
  - scenario: ATS-PFM-NOT-005-04
    suite: TST-PFM-NOT-106
    assertions:
      - >-
        services-platform:modules/notifications/tests/unit/collapsing.spec.js#remembers
        the requests an instance took in, oldest first
      - >-
        services-platform:modules/notifications/tests/unit/collapsing.spec.js#remembers
        a request once, however often it is folded in
      - >-
        services-platform:modules/notifications/tests/unit/collapsing.spec.js#keeps
        the newest fifty and drops the oldest
evidence:
  - 'services-platform:modules/notifications/tests/unit/collapsing.spec.js'
  - The file and referenced assertion titles exist at the pinned commit.
dependency_evidence:
  - 'Real: the pure helpers. Doubled: nothing. Never doubled: the helpers.'
---

# collapsing

## Verification Boundary

This suite checks isolated calculations, validation or presentation with process-local inputs. It does not establish a deployed workflow.

## What This Suite Proves

Its cases exercise collapse matching bursts while separating other events; retain latest contribution details and bounded lineage.

The registered scenario bindings identify the assertions this executable file contributes. They retain individual test references so that a composite scenario does not become a claim of complete execution by one file.

## What It Does Not Prove

Local outcomes do not prove deployed queues, external provider acceptance, production credentials or complete browser behavior. No fresh execution or conformance result is claimed.

## Real Dependencies and Test Doubles

The test file identifies its pure inputs or presentation doubles. Console component suites use recorded request handlers; pure validation suites require no external provider.

## Must Not Be Doubled

The calculation, validator or component under test must execute its real implementation. Doubles supply inputs and external responses without replacing the behavior being proved.