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{

"name": "Timer Engine & Accuracy",

"description": "Tests for the timer engine's precision, delta-time correction, resilience under stress, and recovery from app termination.",

"tests": [

{

"id": "engine-01",

"category": "functional",

"description": "Timer accuracy uses delta-time correction via requestAnimationFrame",

"merged_from": ["Timer accuracy uses delta-time correction for precision", "Timer uses requestAnimationFrame or delta-time corrected setInterval"],

"steps": [

"Step 1: Inspect the timer engine source code",

"Step 2: Verify it uses requestAnimationFrame or setInterval with delta-time correction",

"Step 3: Verify elapsed time is calculated using Date.now() comparisons, not simple increments",

"Step 4: Start a Count Up timer",

"Step 5: Record system time at start using Date.now()",

"Step 6: Wait 30 seconds",

"Step 7: Record system time and timer display at 30 seconds",

"Step 8: Verify timer display is accurate within 1 second of actual elapsed time at 30s mark",

"Step 9: Wait another 30 seconds (60 seconds total)",

"Step 10: Record system time and timer display at 60 seconds",

"Step 11: Verify timer display is accurate within 1 second of actual elapsed time at 60s mark",

"Step 12: Stop the countup timer and verify final displayed time matches elapsed wall-clock time",

"Step 13: Start a Count Down timer set to 60 seconds and record system time",

"Step 14: Wait 30 seconds and verify countdown display is accurate within 1 second",

"Step 15: Wait for countdown to reach 00:00 and verify total elapsed wall-clock time matches 60 seconds within 1 second tolerance"

],

"passes": true

},

{

"id": "engine-02",

"category": "functional",

"description": "App handles termination during active timer using Date.now() comparison",

"steps": [

"Step 1: Start a Count Up timer",

"Step 2: Note the current time and timer display",

"Step 3: Close the app/tab",

"Step 4: Wait 30 seconds",

"Step 5: Reopen the app",

"Step 6: Verify the timer has accounted for elapsed time during closure",

"Step 7: Verify the displayed time is approximately correct using Date.now() comparison"

],

"passes": true

},

{

"id": "engine-03",

"category": "functional",

"description": "Multiple rapid pause/resume cycles maintain timer accuracy",

"steps": [

"Step 1: Start a Count Up timer and note the system time",

"Step 2: Rapidly pause and resume 5 times within the first 15 seconds",

"Step 3: After the 5 cycles, note the displayed time and verify it reflects only active (unpaused) time",

"Step 4: Continue running and rapidly pause and resume 5 more times within the next 15 seconds",

"Step 5: After 10 total pause/resume cycles, record the final displayed time",

"Step 6: Verify the timer display matches actual elapsed active time within 1 second",

"Step 7: Stop the countup timer and save the session",

"Step 8: Start a Count Down timer set to 60 seconds",

"Step 9: Rapidly pause and resume 10 times within 30 seconds",

"Step 10: Verify the countdown display still shows correct remaining time (accounting for paused durations)",

"Step 11: Let countdown finish and verify it reaches 00:00 accurately"

],

"passes": true

}

]

}