File size: 2,949 Bytes
3e05655 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | import { expect, test } from "bun:test"
import { classifySessionSwitch } from "../timeline/session-tab-switch-metrics"
test("counts source and blank samples before the destination is observed", () => {
const result = classifySessionSwitch([
{ observedAtMs: 16, destination: [], source: ["source"], hasVisibleRows: true, last: false },
{ observedAtMs: 32, destination: [], source: [], hasVisibleRows: false, last: false },
{ observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
{ observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
{ observedAtMs: 80, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
])
expect(result.blankSamples).toBe(1)
expect(result.sourceSamples).toBe(1)
expect(result.unknownSamples).toBe(0)
expect(result.firstDestinationObservedMs).toBe(48)
expect(result.stableObservedMs).toBe(80)
})
test("does not classify mixed source and destination content as correct", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: ["source"],
hasVisibleRows: true,
last: true,
bottomErrorPx: 0,
},
{ observedAtMs: 32, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
{ observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
{ observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
])
expect(result.firstCorrectObservedMs).toBe(32)
expect(result.stableObservedMs).toBe(64)
})
test("reports missing correctness without throwing", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: ["source"],
hasVisibleRows: true,
last: true,
bottomErrorPx: 0,
},
])
expect(result.firstDestinationObservedMs).toBe(16)
expect(result.firstCorrectObservedMs).toBeNull()
expect(result.stableObservedMs).toBeNull()
})
test("requires an explicitly tracked part to be visible", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: [],
hasVisibleRows: true,
last: true,
requiredPartVisible: false,
bottomErrorPx: 0,
},
])
expect(result.firstCorrectObservedMs).toBeNull()
})
test("can measure content correctness without requiring a bottom anchor", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: [],
hasVisibleRows: true,
last: true,
requiredPartVisible: true,
bottomAnchorRequired: false,
},
])
expect(result.firstCorrectObservedMs).toBe(16)
})
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