user-timing-helper.js

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// Compares a list of performance entries to a predefined one.

// actualEntries is an array of performance entries from the user agent,

// and expectedEntries is an array of performance entries minted by the test.

// The comparison doesn't assert the order of the entries.

function checkEntries(actualEntries, expectedEntries) {

  assert_equals(actualEntries.length, expectedEntries.length,

      `The length of actual and expected entries should match.

      actual: ${JSON.stringify(actualEntries)},

      expected: ${JSON.stringify(expectedEntries)}`);

  const actualEntrySet = new Set(actualEntries.map(ae=>ae.name));

  assert_equals(actualEntrySet.size, actualEntries.length, `Actual entry names are not unique: ${JSON.stringify(actualEntries)}`);

  const expectedEntrySet = new Set(expectedEntries.map(ee=>ee.name));

  assert_equals(expectedEntrySet.size, expectedEntries.length, `Expected entry names are not unique: ${JSON.stringify(expectedEntries)}`);

  actualEntries.forEach(ae=>{

    const expectedEntry = expectedEntries.find(e=>e.name === ae.name);

    assert_true(!!expectedEntry, `Entry name '${ae.name}' was not found.`);

    checkEntry(ae, expectedEntry);

});

function checkEntry(entry, {name, entryType, startTime, detail, duration}) {

  assert_equals(entry.name, name);

  assert_equals(entry.entryType, entryType);

  if (startTime !== undefined)

    assert_equals(entry.startTime, startTime);

  if (detail !== undefined)

    assert_equals(JSON.stringify(entry.detail), JSON.stringify(detail));

  if (duration !== undefined)

    assert_equals(entry.duration, duration);