| import { expect, test } from "bun:test" |
| import { summarizeFirstNavigation } from "../timeline/first-navigation-metrics" |
|
|
| test("reports blank frames before first destination and stable paint", () => { |
| expect( |
| summarizeFirstNavigation([ |
| { observedAtMs: 16, source: true, destination: false, content: true }, |
| { observedAtMs: 32, source: false, destination: false, content: false }, |
| { observedAtMs: 48, source: false, destination: true, content: true }, |
| { observedAtMs: 64, source: false, destination: true, content: true }, |
| { observedAtMs: 80, source: false, destination: true, content: true }, |
| ]), |
| ).toEqual({ |
| samples: 5, |
| firstDestinationObservedMs: 48, |
| stableDestinationObservedMs: 80, |
| sourceSamples: 1, |
| blankSamples: 1, |
| unknownSamples: 0, |
| destinationSamples: 3, |
| }) |
| }) |
|
|
| test("does not report stability for interrupted destination frames", () => { |
| expect( |
| summarizeFirstNavigation([ |
| { observedAtMs: 16, source: false, destination: true, content: true }, |
| { observedAtMs: 32, source: false, destination: false, content: true }, |
| { observedAtMs: 48, source: false, destination: true, content: true }, |
| ]).stableDestinationObservedMs, |
| ).toBeNull() |
| }) |
|
|
