chore: import upstream snapshot with attribution

2026-07-13 12:25:07 +08:00
commit a26e856398
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+// ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+// ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
+// ┃ ▄▄▄▄▄█ █▄▄▄▄▄ ▄▄▄▄▄█  ▀▀▀▀▀█▀▀▀▀▀ █ ▀▀▀▀▀█ ████████▌▐███ ███▄  ▀█ █ ▀▀▀▀▀ ┃
+// ┃ █▀▀▀▀▀ █▀▀▀▀▀ █▀██▀▀ ▄▄▄▄▄ █ ▄▄▄▄▄█ ▄▄▄▄▄█ ████████▌▐███ █████▄   █ ▄▄▄▄▄ ┃
+// ┃ █      ██████ █  ▀█▄       █ ██████      █      ███▌▐███ ███████▄ █       ┃
+// ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
+// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
+// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
+// ┃ This file is part of the Perspective library, distributed under the terms ┃
+// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
+// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+import { test, expect } from "@perspective-dev/test";
+import perspective from "../perspective_client";
+
+const JAN_1_2024_UTC = 1704067200000;
+
+test.describe("Date timezone invariance", function () {
+    let SAVED_TZ: string | undefined;
+
+    test.beforeEach(() => {
+        SAVED_TZ = process.env.TZ;
+        process.env.TZ = "Europe/Amsterdam";
+    });
+
+    test.afterEach(() => {
+        process.env.TZ = SAVED_TZ;
+    });
+
+    test("date strings serialize to UTC midnight epoch ms", async function () {
+        const table = await perspective.table({ d: "date" });
+        await table.update({ d: ["2024-01-01"] });
+        const view = await table.view();
+        const cols = (await view.to_columns()) as { d: number[] };
+        expect(cols.d).toEqual([JAN_1_2024_UTC]);
+        await view.delete();
+        await table.delete();
+    });
+
+    test("date epoch ms input round-trips exactly", async function () {
+        const table = await perspective.table({ d: "date" });
+        await table.update({ d: [JAN_1_2024_UTC] });
+        const view = await table.view();
+        const cols = (await view.to_columns()) as { d: number[] };
+        expect(cols.d).toEqual([JAN_1_2024_UTC]);
+        await view.delete();
+        await table.delete();
+    });
+
+    test("formatted output prints the stored calendar day", async function () {
+        const table = await perspective.table({ d: "date" });
+        await table.update({ d: ["2024-01-01"] });
+        const view = await table.view();
+        expect(await view.to_columns_string({ formatted: true })).toEqual(
+            '{"d":["2024-01-01"]}',
+        );
+        expect(await view.to_csv()).toEqual('"d"\n2024-01-01\n');
+        await view.delete();
+        await table.delete();
+    });
+
+    test("day_bucket stays on the UTC calendar day at the day boundary", async function () {
+        const table = await perspective.table({ t: "datetime" });
+
+        // 23:59 UTC is already the next day in Europe/Amsterdam
+        await table.update({ t: ["2020-01-31 23:59:00"] });
+        const view = await table.view({
+            expressions: { bucket: `bucket("t", 'D')` },
+        });
+
+        const cols = (await view.to_columns()) as { bucket: number[] };
+
+        // 2020-01-31T00:00:00Z
+        expect(cols.bucket).toEqual([1580428800000]);
+        await view.delete();
+        await table.delete();
+    });
+
+    test("day_of_week and hour_of_day compute in UTC", async function () {
+        const table = await perspective.table({ t: "datetime" });
+        await table.update({ t: ["2020-01-31 23:59:00"] });
+        const view = await table.view({
+            expressions: {
+                dow: `day_of_week("t")`,
+                hod: `hour_of_day("t")`,
+            },
+        });
+
+        const cols = (await view.to_columns()) as {
+            dow: string[];
+            hod: number[];
+        };
+
+        // Friday 23:00 UTC, not Saturday 00:59 Amsterdam
+        expect(cols.dow).toEqual(["6 Friday"]);
+        expect(cols.hod).toEqual([23]);
+        await view.delete();
+        await table.delete();
+    });
+
+    test("JSON date output agrees with Arrow date32 day arithmetic", async function () {
+        const table = await perspective.table({ d: "date" });
+        await table.update({ d: ["2024-01-01"] });
+        const view = await table.view();
+        const cols = (await view.to_columns()) as { d: number[] };
+        expect(cols.d[0] % 86400000).toEqual(0);
+        expect(cols.d[0] / 86400000).toEqual(19723); // days since epoch
+        await view.delete();
+        await table.delete();
+    });
+});