silphius/app/ecs/schema.test.js

import {expect, test} from 'vitest';

import Schema from './schema.js';

test('defaults values', () => {
  const compare = (specification, value) => {
    expect(new Schema(specification).defaultValue())
      .to.deep.equal(value);
  };
  [
    'uint8',
    'int8',
    'uint16',
    'int16',
    'uint32',
    'int32',
    'float32',
    'float64',
  ].forEach((type) => {
    compare({type}, 0);
  });
  [
    'uint64',
    'int64',
  ].forEach((type) => {
    compare({type}, 0n);
  });
  compare({type: 'string'}, '');
  compare({type: 'array', subtype: {type: 'string'}}, []);
  compare(
    {
      type: 'object',
      properties: {
        foo: {type: 'uint8'},
        bar: {type: 'string'},
        baz: {type: 'object', properties: {blah: {type: 'array', subtype: {type: 'string'}}}},
      },
    },
    {foo: 0, bar: '', baz: {blah: []}},
  );
  compare(
    {
      type: 'map',
      value: {
        type: 'object',
        properties: {
          foo: {type: 'uint8'},
          bar: {type: 'string'},
          baz: {type: 'object', properties: {blah: {type: 'array', subtype: {type: 'string'}}}},
        },
      },
    },
    {},
  );
});

test('validates a schema', () => {
  [
    'uint8',
    'int8',
    'uint16',
    'int16',
    'uint32',
    'int32',
    'uint64',
    'int64',
    'float32',
    'float64',
    'string',
  ].forEach((type) => {
    expect(() => {
      new Schema({type});
      new Schema({type: 'array', subtype: {type}});
      new Schema({type: 'object', properties: {foo: {type}}});
      new Schema({type: 'map', value: {type}});
    })
      .to.not.throw();
  });
});

test('calculates the size of concrete instances', () => {
  expect(
    (new Schema({type: 'string'}))
      .sizeOf('hi')
  )
    .to.equal(4 + (new TextEncoder().encode('hi')).length);
  expect(
    (new Schema(
      {
        type: 'object',
        properties: {
          foo: {type: 'uint8'},
          bar: {type: 'uint32'},
          baz: {type: 'string'},
        },
      },
    ))
      .sizeOf({foo: 69, bar: 420, baz: 'aα'})
  )
    .to.equal(
      1
      + 4
      + 4 + (new TextEncoder().encode('aα')).length
    );
  expect(
    (new Schema({type: 'array', subtype: {type: 'string'}}))
      .sizeOf(['hallo', 'hαllo'])
  )
    .to.equal(
      4
      + 4 + (new TextEncoder().encode('hallo')).length
      + 4 + (new TextEncoder().encode('hαllo')).length
    );
  expect(
    (new Schema(
      {
        type: 'map',
        value: {
          type: 'object',
          properties: {
            foo: {type: 'uint8'},
            bar: {type: 'uint32'},
            baz: {type: 'string'},
          },
        },
      },
    ))
      .sizeOf({
        foo: {foo: 69, bar: 420, baz: 'aα'},
        'aα': {foo: 69, bar: 420, baz: 'meow'},
      })
  )
    .to.equal(
      4
      + 4 + (new TextEncoder().encode('foo')).length
      + 1
      + 4
      + 4 + (new TextEncoder().encode('aα')).length
      + 4 + (new TextEncoder().encode('aα')).length
      + 1
      + 4
      + 4 + (new TextEncoder().encode('meow')).length
    );
});

test('encodes and decodes', () => {
  const entries = [
    [{type: 'uint8'}, 255],
    [{type: 'int8'}, -128],
    [{type: 'int8'}, 127],
    [{type: 'uint16'}, 65535],
    [{type: 'int16'}, -32768],
    [{type: 'int16'}, 32767],
    [{type: 'uint32'}, 4294967295],
    [{type: 'int32'}, -2147483648],
    [{type: 'int32'}, 2147483647],
    [{type: 'uint64'}, 18446744073709551615n],
    [{type: 'int64'}, -9223372036854775808n],
    [{type: 'int64'}, 9223372036854775807n],
    [{type: 'float32'}, 0.5],
    [{type: 'float64'}, 1.234],
    [{type: 'string'}, 'hello world'],
    [{type: 'string'}, 'α'],
    [{type: 'array', subtype: {type: 'uint8'}}, [1, 2, 3, 4]],
    [{type: 'array', subtype: {type: 'string'}}, ['one', 'two', 'three', 'four']],
    [{type: 'map', value: {type: 'object', properties: {foo: {type: 'uint8'}, bar: {type: 'string'}}}}, {one: {foo: 64, bar: 'baz'}, two: {foo: 128, bar: 'baw'}}],
    [{type: 'object', properties: {foo: {type: 'uint8'}, bar: {type: 'string'}}}, {foo: 64, bar: 'baz'}],
    [{type: 'object', properties: {foo: {type: 'uint8'}}}, {foo: 64}],
  ];
  entries.forEach(([specification, instance]) => {
    const schema = new Schema(specification);
    const view = new DataView(new ArrayBuffer(schema.sizeOf(instance)));
    schema.serialize(instance, view);
    expect(instance)
      .to.deep.equal(schema.deserialize(view));
  });
});