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LibJS: Implement Temporal.Instant.fromEpochSeconds()
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.Instant.fromEpochSeconds).toHaveLength(1);
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});
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test("basic functionality", () => {
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expect(Temporal.Instant.fromEpochSeconds(0).epochSeconds).toBe(0);
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expect(Temporal.Instant.fromEpochSeconds(1).epochSeconds).toBe(1);
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expect(Temporal.Instant.fromEpochSeconds(999_999_999).epochSeconds).toBe(999_999_999);
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expect(Temporal.Instant.fromEpochSeconds(8_640_000_000_000).epochSeconds).toBe(
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8_640_000_000_000
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);
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expect(Temporal.Instant.fromEpochSeconds(-0).epochSeconds).toBe(0);
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expect(Temporal.Instant.fromEpochSeconds(-1).epochSeconds).toBe(-1);
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expect(Temporal.Instant.fromEpochSeconds(-999_999_999).epochSeconds).toBe(-999_999_999);
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expect(Temporal.Instant.fromEpochSeconds(-8_640_000_000_000).epochSeconds).toBe(
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-8_640_000_000_000
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);
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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.fromEpochSeconds(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.fromEpochSeconds("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 seconds value", () => {
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expect(() => {
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Temporal.Instant.fromEpochSeconds(8_640_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.fromEpochSeconds(-8_640_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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