forked from mirrors/gecko-dev
127 lines
3.3 KiB
JavaScript
127 lines
3.3 KiB
JavaScript
"use strict";
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const { Sampling } = ChromeUtils.importESModule(
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"resource://gre/modules/components-utils/Sampling.sys.mjs"
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);
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add_task(async function testStableSample() {
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// Absolute samples
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equal(
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await Sampling.stableSample("test", 1),
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true,
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"stableSample returns true for 100% sample"
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);
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equal(
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await Sampling.stableSample("test", 0),
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false,
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"stableSample returns false for 0% sample"
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);
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// Known samples. The numbers are nonces to make the tests pass
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equal(
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await Sampling.stableSample("test-0", 0.5),
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true,
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"stableSample returns true for known matching sample"
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);
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equal(
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await Sampling.stableSample("test-1", 0.5),
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false,
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"stableSample returns false for known non-matching sample"
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);
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});
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add_task(async function testBucketSample() {
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// Absolute samples
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equal(
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await Sampling.bucketSample("test", 0, 10, 10),
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true,
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"bucketSample returns true for 100% sample"
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);
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equal(
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await Sampling.bucketSample("test", 0, 0, 10),
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false,
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"bucketSample returns false for 0% sample"
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);
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// Known samples. The numbers are nonces to make the tests pass
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equal(
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await Sampling.bucketSample("test-0", 0, 5, 10),
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true,
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"bucketSample returns true for known matching sample"
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);
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equal(
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await Sampling.bucketSample("test-1", 0, 5, 10),
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false,
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"bucketSample returns false for known non-matching sample"
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);
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});
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add_task(async function testRatioSample() {
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// Invalid input
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await Assert.rejects(
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Sampling.ratioSample("test", []),
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/ratios must be at least 1 element long/,
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"ratioSample rejects for a list with no ratios"
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);
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// Absolute samples
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equal(
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await Sampling.ratioSample("test", [1]),
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0,
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"ratioSample returns 0 for a list with only 1 ratio"
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);
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equal(
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await Sampling.ratioSample("test", [0, 0, 1, 0]),
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2,
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"ratioSample returns the only non-zero bucket if all other buckets are zero"
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);
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// Known samples. The numbers are nonces to make the tests pass
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equal(
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await Sampling.ratioSample("test-0", [1, 1]),
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0,
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"ratioSample returns the correct index for known matching sample"
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);
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equal(
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await Sampling.ratioSample("test-1", [1, 1]),
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1,
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"ratioSample returns the correct index for known non-matching sample"
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);
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});
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add_task(async function testFractionToKey() {
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// Test that results are always 12 character hexadecimal strings.
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const expected_regex = /[0-9a-f]{12}/;
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const count = 100;
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let successes = 0;
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for (let i = 0; i < count; i++) {
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const p = Sampling.fractionToKey(Math.random());
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if (expected_regex.test(p)) {
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successes++;
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}
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}
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equal(successes, count, "fractionToKey makes keys the right length");
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});
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add_task(async function testTruncatedHash() {
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const expected_regex = /[0-9a-f]{12}/;
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const count = 100;
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let successes = 0;
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for (let i = 0; i < count; i++) {
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const h = await Sampling.truncatedHash(Math.random());
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if (expected_regex.test(h)) {
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successes++;
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}
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}
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equal(successes, count, "truncatedHash makes hashes the right length");
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});
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add_task(async function testBufferToHex() {
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const data = new ArrayBuffer(4);
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const view = new DataView(data);
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view.setUint8(0, 0xff);
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view.setUint8(1, 0x7f);
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view.setUint8(2, 0x3f);
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view.setUint8(3, 0x1f);
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equal(Sampling.bufferToHex(data), "ff7f3f1f");
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});
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