forked from mirrors/gecko-dev
5d838d18c1
MozReview-Commit-ID: LsWlHC16145 --HG-- extra : rebase_source : d786176c8a1777e2dfb2ca71476cddf6403f2ec3
79 lines
3.1 KiB
JavaScript
79 lines
3.1 KiB
JavaScript
"use strict";
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ChromeUtils.import("resource://gre/modules/components-utils/Sampling.jsm", this);
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add_task(async function testStableSample() {
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// Absolute samples
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equal(await Sampling.stableSample("test", 1), true, "stableSample returns true for 100% sample");
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equal(await Sampling.stableSample("test", 0), false, "stableSample returns false for 0% sample");
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// Known samples. The numbers are nonces to make the tests pass
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equal(await Sampling.stableSample("test-0", 0.5), true, "stableSample returns true for known matching sample");
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equal(await Sampling.stableSample("test-1", 0.5), false, "stableSample returns false for known non-matching sample");
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});
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add_task(async function testBucketSample() {
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// Absolute samples
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equal(await Sampling.bucketSample("test", 0, 10, 10), true, "bucketSample returns true for 100% sample");
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equal(await Sampling.bucketSample("test", 0, 0, 10), false, "bucketSample returns false for 0% sample");
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// Known samples. The numbers are nonces to make the tests pass
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equal(await Sampling.bucketSample("test-0", 0, 5, 10), true, "bucketSample returns true for known matching sample");
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equal(await Sampling.bucketSample("test-1", 0, 5, 10), false, "bucketSample returns false for known non-matching sample");
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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(Sampling.ratioSample("test", []), /ratios must be at least 1 element long/,
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"ratioSample rejects for a list with no ratios");
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// Absolute samples
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equal(await Sampling.ratioSample("test", [1]), 0, "ratioSample returns 0 for a list with only 1 ratio");
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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(await Sampling.ratioSample("test-0", [1, 1]), 0, "ratioSample returns the correct index for known matching sample");
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equal(await Sampling.ratioSample("test-1", [1, 1]), 1, "ratioSample returns the correct index for known non-matching sample");
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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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