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LibJS: Implement Temporal.Instant.fromEpochMilliseconds()
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.Instant.fromEpochMilliseconds).toHaveLength(1);
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});
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test("basic functionality", () => {
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expect(Temporal.Instant.fromEpochMilliseconds(0).epochMilliseconds).toBe(0);
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expect(Temporal.Instant.fromEpochMilliseconds(1).epochMilliseconds).toBe(1);
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expect(Temporal.Instant.fromEpochMilliseconds(999_999_999).epochMilliseconds).toBe(
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999_999_999
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);
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expect(
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Temporal.Instant.fromEpochMilliseconds(8_640_000_000_000_000).epochMilliseconds
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).toBe(8_640_000_000_000_000);
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expect(Temporal.Instant.fromEpochMilliseconds(-0).epochMilliseconds).toBe(0);
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expect(Temporal.Instant.fromEpochMilliseconds(-1).epochMilliseconds).toBe(-1);
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expect(Temporal.Instant.fromEpochMilliseconds(-999_999_999).epochMilliseconds).toBe(
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-999_999_999
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);
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expect(
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Temporal.Instant.fromEpochMilliseconds(-8_640_000_000_000_000).epochMilliseconds
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).toBe(-8_640_000_000_000_000);
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});
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});
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test("errors", () => {
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test("argument must be coercible to BigInt", () => {
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expect(() => {
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Temporal.Instant.fromEpochMilliseconds(1.23);
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}).toThrowWithMessage(RangeError, "Cannot convert non-integral number to BigInt");
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// NOTE: ToNumber is called on the argument first, so this is effectively NaN.
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expect(() => {
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Temporal.Instant.fromEpochMilliseconds("foo");
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}).toThrowWithMessage(RangeError, "Cannot convert non-integral number to BigInt");
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});
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test("out-of-range epoch milliseconds value", () => {
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expect(() => {
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Temporal.Instant.fromEpochMilliseconds(8_640_000_000_000_001);
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}).toThrowWithMessage(
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RangeError,
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"Invalid epoch nanoseconds value, must be in range -86400 * 10^17 to 86400 * 10^17"
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);
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expect(() => {
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Temporal.Instant.fromEpochMilliseconds(-8_640_000_000_000_001);
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}).toThrowWithMessage(
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RangeError,
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"Invalid epoch nanoseconds value, must be in range -86400 * 10^17 to 86400 * 10^17"
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);
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});
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});
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