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LibJS: Implement Temporal.Instant.fromEpochNanoseconds()
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describe("correct behavior", () => {
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test("length is 1", () => {
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expect(Temporal.Instant.fromEpochNanoseconds).toHaveLength(1);
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});
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test("basic functionality", () => {
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expect(Temporal.Instant.fromEpochNanoseconds(0n).epochNanoseconds).toBe(0n);
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expect(Temporal.Instant.fromEpochNanoseconds(1n).epochNanoseconds).toBe(1n);
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expect(Temporal.Instant.fromEpochNanoseconds(999_999_999n).epochNanoseconds).toBe(
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999_999_999n
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);
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expect(
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Temporal.Instant.fromEpochNanoseconds(8_640_000_000_000_000_000_000n).epochNanoseconds
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).toBe(8_640_000_000_000_000_000_000n);
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expect(Temporal.Instant.fromEpochNanoseconds(-0n).epochNanoseconds).toBe(0n);
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expect(Temporal.Instant.fromEpochNanoseconds(-1n).epochNanoseconds).toBe(-1n);
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expect(Temporal.Instant.fromEpochNanoseconds(-999_999_999n).epochNanoseconds).toBe(
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-999_999_999n
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);
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expect(
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Temporal.Instant.fromEpochNanoseconds(-8_640_000_000_000_000_000_000n).epochNanoseconds
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).toBe(-8_640_000_000_000_000_000_000n);
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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.fromEpochNanoseconds(123);
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}).toThrowWithMessage(TypeError, "Cannot convert number to BigInt");
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expect(() => {
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Temporal.Instant.fromEpochNanoseconds("foo");
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}).toThrowWithMessage(SyntaxError, "Invalid value for BigInt: foo");
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});
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test("out-of-range epoch nanoseconds value", () => {
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expect(() => {
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Temporal.Instant.fromEpochNanoseconds(8_640_000_000_000_000_000_001n);
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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.fromEpochNanoseconds(-8_640_000_000_000_000_000_001n);
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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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