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test: add unit tests for lib/format-date.ts #373

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NiveditJain merged 1 commit into from
May 22, 2026
+29 −0
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test: add unit tests for lib/format-date.ts #373

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29 changes: 29 additions & 0 deletions __tests__/lib/format-date.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
import { describe, it, expect } from "vitest";
import { formatDate } from "@/lib/format-date";

describe("formatDate", () => {
it("formats a standard date: Jan 15, 2024, 3:45 PM", () => {
const date = new Date(2024, 0, 15, 15, 45);
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@coderabbitai coderabbitai Bot May 21, 2026

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⚠️ Potential issue | 🟡 Minor | ⚡ Quick win

Use UTC date construction for deterministic test behavior.

Line 6 should use Date.UTC(...) (as requested in the issue objective) to avoid environment-dependent drift in date creation semantics.

Suggested fix 
-    const date = new Date(2024, 0, 15, 15, 45);
+    const date = new Date(Date.UTC(2024, 0, 15, 15, 45));
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
const date = new Date(2024, 0, 15, 15, 45);
const date = new Date(Date.UTC(2024, 0, 15, 15, 45));
🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@__tests__/lib/format-date.test.ts` at line 6, The test creates a local-time
Date with new Date(2024, 0, 15, 15, 45) which can be non-deterministic across
environments; change the construction to use UTC by replacing that line with new
Date(Date.UTC(2024, 0, 15, 15, 45)) (locate the const date in
__tests__/lib/format-date.test.ts) so the test uses a deterministic UTC
timestamp.

expect(formatDate(date)).toBe("Jan 15, 2024, 3:45 PM");
});

it("formats start of month: Mar 1, 2024, 9:30 AM", () => {
const date = new Date(2024, 2, 1, 9, 30);
expect(formatDate(date)).toBe("Mar 1, 2024, 9:30 AM");
});

it("formats midnight: Feb 10, 2024, 12:00 AM", () => {
const date = new Date(2024, 1, 10, 0, 0);
expect(formatDate(date)).toBe("Feb 10, 2024, 12:00 AM");
});

it("formats single-digit day: Jul 5, 2024, 2:15 PM", () => {
const date = new Date(2024, 6, 5, 14, 15);
expect(formatDate(date)).toBe("Jul 5, 2024, 2:15 PM");
});

it("formats end of year: Dec 31, 2024, 11:59 PM", () => {
const date = new Date(2024, 11, 31, 23, 59);
expect(formatDate(date)).toBe("Dec 31, 2024, 11:59 PM");
});
});