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import test from 'tape';
import CacheableObject from '../src/thing/cacheable-object.js';
// Utility
function newCacheableObject(PD) {
return new (class extends CacheableObject {
static propertyDescriptors = PD;
});
}
// Tests
test(`CacheableObject simple separate update & expose`, t => {
const obj = newCacheableObject({
number: {
flags: {
update: true
}
},
timesTwo: {
flags: {
expose: true
},
expose: {
dependencies: ['number'],
compute: ({ number }) => number * 2
}
}
});
t.plan(1);
obj.number = 5;
t.equal(obj.timesTwo, 10);
});
test(`CacheableObject basic cache behavior`, t => {
let computeCount = 0;
const obj = newCacheableObject({
string: {
flags: {
update: true
}
},
karkat: {
flags: {
expose: true
},
expose: {
dependencies: ['string'],
compute: ({ string }) => {
computeCount++;
return string.toUpperCase();
}
}
}
});
t.plan(8);
t.is(computeCount, 0);
obj.string = 'hello world';
t.is(computeCount, 0);
obj.karkat;
t.is(computeCount, 1);
obj.karkat;
t.is(computeCount, 1);
obj.string = 'testing once again';
t.is(computeCount, 1);
obj.karkat;
t.is(computeCount, 2);
obj.string = 'testing once again';
t.is(computeCount, 2);
obj.karkat;
t.is(computeCount, 2);
});
test(`CacheableObject combined update & expose (no transform)`, t => {
const obj = newCacheableObject({
directory: {
flags: {
update: true,
expose: true
}
}
});
t.plan(2);
t.directory = 'the-world-revolving';
t.is(t.directory, 'the-world-revolving');
t.directory = 'chaos-king';
t.is(t.directory, 'chaos-king');
});
test(`CacheableObject combined update & expose (basic transform)`, t => {
const obj = newCacheableObject({
getsRepeated: {
flags: {
update: true,
expose: true
},
expose: {
transform: value => value.repeat(2)
}
}
});
t.plan(1);
obj.getsRepeated = 'dog';
t.is(obj.getsRepeated, 'dogdog');
});
test(`CacheableObject combined update & expose (transform with dependency)`, t => {
const obj = newCacheableObject({
customRepeat: {
flags: {
update: true,
expose: true
},
expose: {
dependencies: ['times'],
transform: (value, { times }) => value.repeat(times)
}
},
times: {
flags: {
update: true
}
}
});
t.plan(3);
obj.customRepeat = 'dog';
obj.times = 1;
t.is(obj.customRepeat, 'dog');
obj.times = 5;
t.is(obj.customRepeat, 'dogdogdogdogdog');
obj.customRepeat = 'cat';
t.is(obj.customRepeat, 'catcatcatcatcat');
});
test(`CacheableObject validate on update`, t => {
const mockError = new TypeError(`Expected a string, not ${typeof value}`);
const obj = newCacheableObject({
directory: {
flags: {
update: true,
expose: true
},
update: {
validate: value => {
if (typeof value !== 'string') {
throw mockError;
}
return true;
}
}
},
date: {
flags: {
update: true,
expose: true
},
update: {
validate: value => (value instanceof Date)
}
}
});
let thrownError;
t.plan(6);
obj.directory = 'megalovania';
t.is(obj.directory, 'megalovania');
try {
obj.directory = 25;
} catch (err) {
thrownError = err;
}
t.is(thrownError, mockError);
t.is(obj.directory, 'megalovania');
const date = new Date(`25 December 2009`);
obj.date = date;
t.is(obj.date, date);
try {
obj.date = `TWELFTH PERIGEE'S EVE`;
} catch (err) {
thrownError = err;
}
t.is(thrownError?.constructor, TypeError);
t.is(obj.date, date);
});
test(`CacheableObject default update property value`, t => {
const obj = newCacheableObject({
fruit: {
flags: {
update: true,
expose: true
},
update: {
default: 'potassium'
}
}
});
t.plan(1);
t.is(obj.fruit, 'potassium');
});
test(`CacheableObject default property throws if invalid`, t => {
const mockError = new TypeError(`Expected a string, not ${typeof value}`);
t.plan(1);
let thrownError;
try {
newCacheableObject({
string: {
flags: {
update: true
},
update: {
default: 123,
validate: value => {
if (typeof value !== 'string') {
throw mockError;
}
return true;
}
}
}
});
} catch (err) {
thrownError = err;
}
t.is(thrownError, mockError);
});
|
