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test.js
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test.js
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import test from 'ava';
import delay from 'delay';
import m from '.';
test('memoize', t => {
let i = 0;
const f = () => i++;
const memoized = m(f);
t.is(memoized(), 0);
t.is(memoized(), 0);
t.is(memoized(), 0);
t.is(memoized('foo'), 1);
t.is(memoized('foo'), 1);
t.is(memoized('foo'), 1);
t.is(memoized('foo', 'bar'), 2);
t.is(memoized('foo', 'bar'), 2);
t.is(memoized('foo', 'bar'), 2);
});
test('memoize with multiple non-primitive arguments', t => {
let i = 0;
const memoized = m(() => i++);
t.is(memoized(), 0);
t.is(memoized(), 0);
t.is(memoized({foo: true}, {bar: false}), 1);
t.is(memoized({foo: true}, {bar: false}), 1);
t.is(memoized({foo: true}, {bar: false}, {baz: true}), 2);
t.is(memoized({foo: true}, {bar: false}, {baz: true}), 2);
});
test('maxAge option', async t => {
let i = 0;
const f = () => i++;
const memoized = m(f, {maxAge: 100});
t.is(memoized(1), 0);
t.is(memoized(1), 0);
await delay(50);
t.is(memoized(1), 0);
await delay(200);
t.is(memoized(1), 1);
});
test('maxAge option deletes old items', async t => {
let i = 0;
const f = () => i++;
const cache = new Map();
const deleted = [];
const remove = cache.delete.bind(cache);
cache.delete = item => {
deleted.push(item);
return remove(item);
};
const memoized = m(f, {maxAge: 100, cache});
t.is(memoized(1), 0);
t.is(memoized(1), 0);
t.is(cache.has(1), true);
await delay(50);
t.is(memoized(1), 0);
t.is(deleted.length, 0);
await delay(200);
t.is(memoized(1), 1);
t.is(deleted.length, 1);
t.is(deleted[0], 1);
});
test('maxAge items are deleted even if function throws', async t => {
let i = 0;
const f = () => {
if (i === 1) {
throw new Error('failure');
}
return i++;
};
const cache = new Map();
const memoized = m(f, {maxAge: 100, cache});
t.is(memoized(1), 0);
t.is(memoized(1), 0);
t.is(cache.size, 1);
await delay(50);
t.is(memoized(1), 0);
await delay(200);
t.throws(() => memoized(1), 'failure');
t.is(cache.size, 0);
});
test('cacheKey option', t => {
let i = 0;
const f = () => i++;
const memoized = m(f, {cacheKey: x => x});
t.is(memoized(1), 0);
t.is(memoized(1), 0);
t.is(memoized(1, 2), 0);
t.is(memoized(2), 1);
t.is(memoized(2, 1), 1);
});
test('cache option', t => {
let i = 0;
const f = () => i++;
const memoized = m(f, {
cache: new WeakMap(),
cacheKey: x => x
});
const foo = {};
const bar = {};
t.is(memoized(foo), 0);
t.is(memoized(foo), 0);
t.is(memoized(bar), 1);
t.is(memoized(bar), 1);
});
test('promise support', async t => {
let i = 0;
const memoized = m(async () => i++);
t.is(await memoized(), 0);
t.is(await memoized(), 0);
t.is(await memoized(10), 1);
});
test('do not cache rejected promises', async t => {
let i = 0;
const memoized = m(async () => {
i++;
if (i === 1) {
throw new Error('foo bar');
}
return i;
});
await t.throws(memoized(), 'foo bar');
const first = memoized();
const second = memoized();
const third = memoized();
t.is(await first, 2);
t.is(await second, 2);
t.is(await third, 2);
});
test('cache rejected promises if enabled', async t => {
let i = 0;
const memoized = m(async () => {
i++;
if (i === 1) {
throw new Error('foo bar');
}
return i;
}, {
cachePromiseRejection: true
});
await t.throws(memoized(), 'foo bar');
await t.throws(memoized(), 'foo bar');
await t.throws(memoized(), 'foo bar');
});
test('preserves the original function name', t => {
t.is(m(function foo() {}).name, 'foo'); // eslint-disable-line func-names, prefer-arrow-callback
});
test('.clear()', t => {
let i = 0;
const f = () => i++;
const memoized = m(f);
t.is(memoized(), 0);
t.is(memoized(), 0);
m.clear(memoized);
t.is(memoized(), 1);
t.is(memoized(), 1);
});
test('prototype support', t => {
const f = function () {
return this.i++;
};
const Unicorn = function () {
this.i = 0;
};
Unicorn.prototype.foo = m(f);
const unicorn = new Unicorn();
t.is(unicorn.foo(), 0);
t.is(unicorn.foo(), 0);
t.is(unicorn.foo(), 0);
});