Added tests for format and storage, run in UK time

web/src/lib/format.test.ts

@@ -0,0 +1,28 @@
+import { expect, test } from 'vitest';
+
+import { formatDate, formatMoney, parseDate } from './format';
+
+test.each([
+  { name: 'null', value: null },
+  { name: 'undefined', value: undefined },
+  { name: 'empty', value: '' },
+  { name: 'Go’s zero time', value: '0001-01-01T00:00:00Z' },
+  { name: 'not a date', value: 'soon' },
+])('parseDate reads $name as no date', ({ value }) => {
+  expect(parseDate(value)).toBeNull();
+  expect(formatDate(value)).toBe('—');
+});
+
+test('dates are shown day, short month and year', () => {
+  // Tests run in UK time (vite.config.ts), as dates are shown in local time.
+  expect(parseDate('2026-03-03T12:00:00Z')?.toISOString()).toBe('2026-03-03T12:00:00.000Z');
+  expect(formatDate('2026-03-03T12:00:00Z')).toBe('3 Mar 2026');
+  // 23:30 UTC is already the next day in British Summer Time.
+  expect(formatDate('2026-07-01T23:30:00Z')).toBe('2 Jul 2026');
+});
+
+test('money is shown in whole pounds, and nothing as a dash', () => {
+  expect(formatMoney(125000.5)).toBe('£125,001');
+  expect(formatMoney(0)).toBe('—');
+  expect(formatMoney(-5)).toBe('—');
+});

web/src/lib/storage.test.ts

@@ -0,0 +1,36 @@
+import { afterEach, expect, test, vi } from 'vitest';
+
+import { readStored, writeStored } from './storage';
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
+
+test('reads and writes localStorage', () => {
+  const stored = new Map<string, string>();
+  vi.stubGlobal('window', {
+    localStorage: {
+      getItem: (key: string) => stored.get(key) ?? null,
+      setItem: (key: string, value: string) => stored.set(key, value),
+    },
+  });
+
+  expect(readStored('job_search.theme')).toBeNull();
+  writeStored('job_search.theme', 'dark');
+  expect(readStored('job_search.theme')).toBe('dark');
+});
+
+test('storage that throws reads as nothing stored and ignores writes', () => {
+  const refuse = (): never => {
+    throw new Error('storage is disabled');
+  };
+  vi.stubGlobal('window', {
+    localStorage: {
+      getItem: refuse,
+      setItem: refuse,
+    },
+  });
+
+  expect(readStored('job_search.theme')).toBeNull();
+  expect(() => writeStored('job_search.theme', 'dark')).not.toThrow();
+});

web/vite.config.ts

@@ -26,9 +26,11 @@ export default defineConfig(({ mode }) => {
     },
     // Vitest. vite-plugin-solid would run tests in jsdom, which isn't
     // installed: nothing tested yet renders, and Solid's reactivity works
-    // in Node as it is.
+    // in Node as it is. Dates are shown in local time, so tests run in UK
+    // time wherever they run.
     test: {
       environment: 'node',
+      env: { TZ: 'Europe/London' },
     },
   };
 });