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