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test: cover time zone changes after mount #3011

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Merged
gpbl merged 1 commit into from
Aug 22, 2026
+27 −0
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test: cover time zone changes after mount #3011

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27 changes: 27 additions & 0 deletions packages/react-day-picker/src/DayPicker.test.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -533,6 +533,33 @@ describe("when the `month` is changed programmatically", () => {
});
});

describe("when the timeZone changes after mount", () => {
const defaultMonth = new Date("2024-01-01T00:30:00.000Z");
let rerender: ReturnType<typeof render>["rerender"];

beforeEach(() => {
({ rerender } = render(
<DayPicker defaultMonth={defaultMonth} timeZone="America/New_York" />,
));
});

test("displays the month in the initial time zone", () => {
expect(grid("December 2023")).toBeInTheDocument();
});

describe("when the instant falls in the following month in the new time zone", () => {
beforeEach(() => {
rerender(
<DayPicker defaultMonth={defaultMonth} timeZone="Europe/Berlin" />,
);
});

test("displays the month in the new time zone", () => {
expect(grid("January 2024")).toBeInTheDocument();
});
});
});

test("extends the default locale", () => {
render(
<DayPicker
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