98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
function shouldBe(actual, expected) {
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if (actual !== expected)
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throw new Error(`expected ${expected} but got ${actual}`);
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}
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function shouldNotThrow(script) {
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eval(script);
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}
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function shouldThrowSyntaxError(script) {
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let error;
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try {
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eval(script);
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} catch (e) {
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error = e;
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}
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if (!(error instanceof SyntaxError))
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throw new Error('Expected SyntaxError!');
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}
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function testBasicCases() {
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shouldBe(undefined ?? 3, 3);
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shouldBe(null ?? 3, 3);
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shouldBe(true ?? 3, true);
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shouldBe(false ?? 3, false);
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shouldBe(0 ?? 3, 0);
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shouldBe(1 ?? 3, 1);
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shouldBe('' ?? 3, '');
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shouldBe('hi' ?? 3, 'hi');
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shouldBe(({} ?? 3) instanceof Object, true);
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shouldBe(({ x: 'hi' } ?? 3).x, 'hi');
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shouldBe(([] ?? 3) instanceof Array, true);
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shouldBe((['hi'] ?? 3)[0], 'hi');
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shouldBe((makeMasquerader() ?? 3) == null, true);
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}
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noInline(testBasicCases);
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for (let i = 0; i < 1e5; i++)
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testBasicCases();
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shouldBe(1 | null ?? 3, 1);
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shouldBe(1 ^ null ?? 3, 1);
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shouldBe(1 & null ?? 3, 0);
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shouldBe(3 == null ?? 3, false);
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shouldBe(3 != null ?? 3, true);
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shouldBe(3 === null ?? 3, false);
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shouldBe(3 !== null ?? 3, true);
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shouldBe(1 < null ?? 3, false);
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shouldBe(1 > null ?? 3, true);
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shouldBe(1 <= null ?? 3, false);
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shouldBe(1 >= null ?? 3, true);
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shouldBe(1 << null ?? 3, 1);
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shouldBe(1 >> null ?? 3, 1);
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shouldBe(1 >>> null ?? 3, 1);
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shouldBe(1 + null ?? 3, 1);
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shouldBe(1 - null ?? 3, 1);
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shouldBe(1 * null ?? 3, 0);
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shouldBe(1 / null ?? 3, Infinity);
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shouldBe(isNaN(1 % null ?? 3), true);
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shouldBe(1 ** null ?? 3, 1);
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const obj = {
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count: 0,
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get x() { this.count++; return 'x'; }
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};
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false ?? obj.x;
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shouldBe(obj.count, 0);
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null ?? obj.x;
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shouldBe(obj.count, 1);
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obj.x ?? obj.x;
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shouldBe(obj.count, 2);
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shouldThrowSyntaxError('0 || 1 ?? 2');
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shouldThrowSyntaxError('0 && 1 ?? 2');
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shouldThrowSyntaxError('0 ?? 1 || 2');
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shouldThrowSyntaxError('0 ?? 1 && 2');
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shouldNotThrow('(0 || 1) ?? 2');
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shouldNotThrow('0 || (1 ?? 2)');
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shouldNotThrow('(0 && 1) ?? 2');
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shouldNotThrow('0 && (1 ?? 2)');
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shouldNotThrow('(0 ?? 1) || 2');
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shouldNotThrow('0 ?? (1 || 2)');
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shouldNotThrow('(0 ?? 1) && 2');
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shouldNotThrow('0 ?? (1 && 2)');
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shouldNotThrow('0 || 1 && 2 | 3 ^ 4 & 5 == 6 != 7 === 8 !== 9 < 0 > 1 <= 2 >= 3 << 4 >> 5 >>> 6 + 7 - 8 * 9 / 0 % 1 ** 2');
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shouldThrowSyntaxError('0 || 1 && 2 | 3 ^ 4 & 5 == 6 != 7 === 8 !== 9 < 0 > 1 <= 2 >= 3 << 4 >> 5 >>> 6 + 7 - 8 * 9 / 0 % 1 ** 2 ?? 3');
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shouldThrowSyntaxError('3 ?? 2 ** 1 % 0 / 9 * 8 - 7 + 6 >>> 5 >> 4 << 3 >= 2 <= 1 > 0 < 9 !== 8 === 7 != 6 == 5 & 4 ^ 3 | 2 && 1 || 0');
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shouldBe(null?.x ?? 3, 3);
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shouldBe(({})?.x ?? 3, 3);
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shouldBe(({ x: 0 })?.x ?? 3, 0);
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shouldBe(null?.() ?? 3, 3);
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shouldBe((() => 0)?.() ?? 3, 0);
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shouldBe(({ x: 0 })?.[null?.a ?? 'x'] ?? 3, 0);
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shouldBe((() => 0)?.(null?.a ?? 'x') ?? 3, 0);
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