Add unit tests for the upload/date helpers and a CI workflow

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - name: Lint
+        run: npm run lint
+      - name: Typecheck
+        run: npx tsc --noEmit
+      - name: Test
+        run: npm test

lib/event-date.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { daysUntilEvent, eventCountdownLabel, formatEventDate } from "./event-date";
+
+const now = new Date(2026, 6, 18, 9, 30);
+
+describe("formatEventDate", () => {
+  it("formats a YYYY-MM-DD date in local time", () => {
+    expect(formatEventDate("2026-07-17")).toBe("Jul 17, 2026");
+  });
+
+  it("passes through values it cannot parse", () => {
+    expect(formatEventDate("TBD")).toBe("TBD");
+  });
+});
+
+describe("daysUntilEvent", () => {
+  it("ignores the time of day on both sides", () => {
+    expect(daysUntilEvent("2026-07-18", now)).toBe(0);
+    expect(daysUntilEvent("2026-07-19", now)).toBe(1);
+    expect(daysUntilEvent("2026-08-01", now)).toBe(14);
+  });
+
+  it("is negative for past events", () => {
+    expect(daysUntilEvent("2026-07-11", now)).toBe(-7);
+  });
+});
+
+describe("eventCountdownLabel", () => {
+  it("labels today and tomorrow by name", () => {
+    expect(eventCountdownLabel("2026-07-18", now)).toBe("Today");
+    expect(eventCountdownLabel("2026-07-19", now)).toBe("Tomorrow");
+  });
+
+  it("counts the remaining days for later events", () => {
+    expect(eventCountdownLabel("2026-07-21", now)).toBe("In 3 days");
+  });
+
+  it("returns null once the event has passed", () => {
+    expect(eventCountdownLabel("2026-07-17", now)).toBeNull();
+  });
+});

lib/spreadsheet.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { extractCodes, extractEmails, parseCsv } from "./spreadsheet";
+
+describe("parseCsv", () => {
+  it("parses quoted fields, escaped quotes and CRLF line endings", () => {
+    const text = 'name,email\r\n"Dabit, Nader","nader@example.com"\r\n"He said ""hi""",x@y.co';
+    expect(parseCsv(text)).toEqual([
+      ["name", "email"],
+      ["Dabit, Nader", "nader@example.com"],
+      ['He said "hi"', "x@y.co"],
+    ]);
+  });
+
+  it("drops rows that are entirely blank", () => {
+    expect(parseCsv("a@b.co\n\n   \nc@d.co\n")).toEqual([["a@b.co"], ["c@d.co"]]);
+  });
+});
+
+describe("extractEmails", () => {
+  it("finds emails in any column and lowercases them", () => {
+    const rows = [
+      ["Name", "Company", "Email"],
+      ["Nader", "Cognition", "Nader@Example.com"],
+      ["Ada", "", "Ada Lovelace <ada@example.com>"],
+    ];
+    expect(extractEmails(rows)).toEqual(["nader@example.com", "ada@example.com"]);
+  });
+
+  it("dedupes repeated addresses", () => {
+    const rows = [["a@b.co"], ["A@B.co"], ["c@d.co"]];
+    expect(extractEmails(rows)).toEqual(["a@b.co", "c@d.co"]);
+  });
+});
+
+describe("extractCodes", () => {
+  it("uses the column whose header is named like a code", () => {
+    const rows = [
+      ["email", "Credit Code"],
+      ["a@b.co", "CODE-1"],
+      ["c@d.co", "CODE-2"],
+    ];
+    expect(extractCodes(rows)).toEqual(["CODE-1", "CODE-2"]);
+  });
+
+  it("keeps every row of a headerless single-column file", () => {
+    const rows = [["CODE-1"], ["CODE-2"], ["CODE-3"]];
+    expect(extractCodes(rows)).toEqual(["CODE-1", "CODE-2", "CODE-3"]);
+  });
+
+  it("trims, dedupes and skips empty cells", () => {
+    const rows = [["code"], [" CODE-1 "], ["CODE-1"], [""], ["CODE-2"]];
+    expect(extractCodes(rows)).toEqual(["CODE-1", "CODE-2"]);
+  });
+
+  it("returns nothing for an empty file", () => {
+    expect(extractCodes([])).toEqual([]);
+  });
+});