tests.js

testGetFormattedTime();
testNoDuplicatesInWordList();
testThatDifficultyMatchesDropdownWhenStartGuessing();

function testGetFormattedTime() {
    const start = new Date('2000-01-01T00:00:00');

    getFormattedTime(start, start) === '0s' || oops();
    getFormattedTime(start, new Date('2000-01-01T00:00:03')) === '3s' || oops();
    getFormattedTime(start, new Date('2000-01-01T00:00:10')) === '10s' || oops();
    getFormattedTime(start, new Date('2000-01-01T00:27:01')) === '27m 1s' || oops();
    getFormattedTime(start, new Date('2000-01-01T00:46:59')) === '46m 59s' || oops();
    getFormattedTime(start, new Date('2000-01-01T01:02:45')) === '1h 2m 45s' || oops();
    getFormattedTime(start, new Date('2000-01-01T23:19:08')) === '23h 19m 8s' || oops();
}

function testNoDuplicatesInWordList() {
    const wordsSeenBefore = new Set();
    for (const wordListKey in possibleWords) {
        possibleWords[wordListKey].forEach(newPossibleWord => {
            if (newPossibleWord && wordsSeenBefore.has(newPossibleWord)) {
                oops(newPossibleWord);
            }
            wordsSeenBefore.add(newPossibleWord);
        });
    }
}

function testThatDifficultyMatchesDropdownWhenStartGuessing() {
    getDifficultyChanger().value = 'hard';
    getInput().value = 'guess';
    document.getElementById('submit-guess').click();
    if (difficulty !== 'hard') {
        oops('expected difficulty to match dropdown');
    }
}


function oops(didNotExpect = '') {
    throw new Error(`oops: ${didNotExpect}`);
}