@shopify/flash-list
Version:
FlashList is a more performant FlatList replacement
69 lines • 3.06 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var AverageWindow_1 = require("../utils/AverageWindow");
describe("AverageWindow", function () {
var fillAverageWindow = function (averageWindow, from, to) {
for (var i = from; i < to; i++) {
averageWindow.addValue(i);
}
};
it("all input window values should be filled with correct values", function () {
var commonValue = 50;
var size = 100;
var averageWindow = new AverageWindow_1.AverageWindow(size);
var inputValues = averageWindow["inputValues"];
for (var i = 0; i < size; i++) {
averageWindow.addValue(commonValue);
}
expect(Math.round(averageWindow.currentValue)).toBe(commonValue);
expect(inputValues.every(function (val) { return val === commonValue; })).toBe(true);
});
it("computes correct average", function () {
// We're gonna check if average from internal array matches the current average value
var size = 100;
var averageWindow = new AverageWindow_1.AverageWindow(size);
var inputValues = averageWindow["inputValues"];
fillAverageWindow(averageWindow, 0, 200);
// calculate average directly
var reduceObj = inputValues.reduce(function (obj, val) {
if (val !== undefined) {
obj.sum += val;
obj.count++;
}
return obj;
}, { sum: 0, count: 0 });
// running average could be different by few decimal points so floor is required
expect(Math.floor(averageWindow.currentValue)).toBe(Math.floor(reduceObj.sum / reduceObj.count));
});
it("should prioritize new values quickly", function () {
var size = 30;
var averageWindow = new AverageWindow_1.AverageWindow(size);
fillAverageWindow(averageWindow, 0, 100);
expect(averageWindow.currentValue).toBeGreaterThan(70);
fillAverageWindow(averageWindow, 0, 30);
expect(averageWindow.currentValue).toBeLessThan(30);
});
it("reports initial average correctly", function () {
var size = 30;
var averageWindow = new AverageWindow_1.AverageWindow(size, 25);
expect(averageWindow.currentValue).toBe(25);
});
it("updates initial average correctly", function () {
var size = 30;
var averageWindow = new AverageWindow_1.AverageWindow(size, 10);
averageWindow.addValue(20);
expect(averageWindow.currentValue).toBe(15);
});
it("increments next index correctly", function () {
var size = 30;
var averageWindow = new AverageWindow_1.AverageWindow(size);
for (var i = 0; i < 300; i++) {
expect(averageWindow["getNextIndex"]()).toBe(i % size);
}
var averageWindow2 = new AverageWindow_1.AverageWindow(size, 1);
for (var i = 1; i < 300; i++) {
expect(averageWindow2["getNextIndex"]()).toBe(i % size);
}
});
});
//# sourceMappingURL=AverageWindow.test.js.map