symbol.js

'use strict';

const assert = require('assert');

module.exports = require('./common').runTest(test);

function test (binding) {
  const majorNodeVersion = process.versions.node.split('.')[0];

  const wellKnownSymbolFunctions = ['asyncIterator', 'hasInstance', 'isConcatSpreadable', 'iterator', 'match', 'replace', 'search', 'split', 'species', 'toPrimitive', 'toStringTag', 'unscopables'];
  if (majorNodeVersion >= 12) {
    wellKnownSymbolFunctions.push('matchAll');
  }

  function assertCanCreateSymbol (symbol) {
    assert(binding.symbol.createNewSymbolWithCppStr(symbol) !== null);
    assert(binding.symbol.createNewSymbolWithCStr(symbol) !== null);
    assert(binding.symbol.createNewSymbolWithNapi(symbol) !== null);
  }

  function assertSymbolAreUnique (symbol) {
    const symbolOne = binding.symbol.createNewSymbolWithCppStr(symbol);
    const symbolTwo = binding.symbol.createNewSymbolWithCppStr(symbol);

    assert(symbolOne !== symbolTwo);
  }

  function assertSymbolIsWellknown (symbol) {
    const symbOne = binding.symbol.getWellKnownSymbol(symbol);
    const symbTwo = binding.symbol.getWellKnownSymbol(symbol);
    assert(symbOne && symbTwo);
    assert(symbOne === symbTwo);
  }

  function assertSymbolIsNotWellknown (symbol) {
    const symbolTest = binding.symbol.getWellKnownSymbol(symbol);
    assert(symbolTest === undefined);
  }

  function assertCanCreateOrFetchGlobalSymbols (symbol, fetchFunction) {
    const symbOne = fetchFunction(symbol);
    const symbTwo = fetchFunction(symbol);
    assert(symbOne && symbTwo);
    assert(symbOne === symbTwo);
  }

  assertCanCreateSymbol('testing');
  assertSymbolAreUnique('symbol');
  assertSymbolIsNotWellknown('testing');

  for (const wellknownProperty of wellKnownSymbolFunctions) {
    assertSymbolIsWellknown(wellknownProperty);
  }

  assertCanCreateOrFetchGlobalSymbols('data', binding.symbol.getSymbolFromGlobalRegistry);
  assertCanCreateOrFetchGlobalSymbols('CppKey', binding.symbol.getSymbolFromGlobalRegistryWithCppKey);
  assertCanCreateOrFetchGlobalSymbols('CKey', binding.symbol.getSymbolFromGlobalRegistryWithCKey);

  assert(binding.symbol.createNewSymbolWithNoArgs() === undefined);

  // eslint-disable-next-line no-self-compare
  assert(binding.symbol.testNullSymbolCanBeCreated() === binding.symbol.testNullSymbolCanBeCreated());
  // eslint-disable-next-line no-self-compare
  assert(binding.symbol.testUndefinedSymbolCanBeCreated() === binding.symbol.testUndefinedSymbolCanBeCreated());
  assert(binding.symbol.testUndefinedSymbolCanBeCreated() !== binding.symbol.testNullSymbolCanBeCreated());
}