fix: move date logic to its own file with tests

app/[lang]/(live)/(public)/hotelreservation/(standard)/select-rate/getValidDates.test.ts

@@ -0,0 +1,51 @@
+import { beforeAll, describe, expect, it } from "@jest/globals"
+
+import { getValidFromDate, getValidToDate } from "./getValidDates"
+
+const NOW = new Date("2020-10-01T00:00:00Z")
+describe("getValidFromDate", () => {
+  beforeAll(() => {
+    jest.useFakeTimers({ now: NOW })
+  })
+
+  it("returns today when empty string is provided", () => {
+    const actual = getValidFromDate("")
+    expect(actual.toISOString()).toBe("2020-10-01T00:00:00.000Z")
+  })
+
+  it("returns today when undefined is provided", () => {
+    const actual = getValidFromDate(undefined)
+    expect(actual.toISOString()).toBe("2020-10-01T00:00:00.000Z")
+  })
+
+  it("returns given date in utc", () => {
+    const actual = getValidFromDate("2024-01-01")
+    expect(actual.toISOString()).toBe("2023-12-31T23:00:00.000Z")
+  })
+})
+
+describe("getValidToDate", () => {
+  beforeAll(() => {
+    jest.useFakeTimers({ now: NOW })
+  })
+
+  it("returns day after fromDate when empty string is provided", () => {
+    const actual = getValidToDate("", NOW)
+    expect(actual.toISOString()).toBe("2020-10-02T00:00:00.000Z")
+  })
+
+  it("returns day after fromDate when undefined is provided", () => {
+    const actual = getValidToDate(undefined, NOW)
+    expect(actual.toISOString()).toBe("2020-10-02T00:00:00.000Z")
+  })
+
+  it("returns given date in utc", () => {
+    const actual = getValidToDate("2024-01-01", NOW)
+    expect(actual.toISOString()).toBe("2023-12-31T23:00:00.000Z")
+  })
+
+  it("fallsback to day after fromDate when given date is before fromDate", () => {
+    const actual = getValidToDate("2020-09-30", NOW)
+    expect(actual.toISOString()).toBe("2020-10-02T00:00:00.000Z")
+  })
+})