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Original file line number Diff line number Diff line change
@@ -1,18 +1,30 @@
describe("Runtime exposes", function () {
it("__time a low overhead, high resolution, time in ms.", function() {
var dateTimeStart = Date.now();
var timeStart = __time();
var acc = 0;
var s = android.os.SystemClock.elapsedRealtime();
for (var i = 0; i < 1000; i++) {
var c = android.os.SystemClock.elapsedRealtime();
acc += (c - s);
s = c;
// Try to get the times using Date.now and __time and compare the results, expect them to be somewhat "close".
// Sometimes GC hits after Date.now is captured but before __time or the vice-versa and the test fails,
// so we are giving it several attempts.
for(var i = 0; i < 5; i++) {
try {
var dateTimeStart = Date.now();
var timeStart = __time();
var acc = 0;
var s = android.os.SystemClock.elapsedRealtime();
for (var i = 0; i < 1000; i++) {
var c = android.os.SystemClock.elapsedRealtime();
acc += (c - s);
s = c;
}
var dateTimeEnd = Date.now();
var timeEnd = __time();
var dateDelta = dateTimeEnd - dateTimeStart;
var timeDelta = timeEnd - timeStart;
expect(Math.abs(dateDelta - timeDelta) < dateDelta * 0.25).toBe(true);
break;
} catch(e) {
if (i == 4) {
throw e;
}
}
}
var dateTimeEnd = Date.now();
var timeEnd = __time();
var dateDelta = dateTimeEnd - dateTimeStart;
var timeDelta = timeEnd - timeStart;
expect(Math.abs(dateDelta - timeDelta) < dateDelta * 0.25).toBe(true);
});
});