Split logic into models file and add tests

src/tools/bcrypt/bcrypt.models.test.ts

@@ -0,0 +1,49 @@
+import { compare, hash } from 'bcryptjs';
+import { assert, describe, expect, test } from 'vitest';
+import { type Update, bcryptWithProgressUpdates } from './bcrypt.models';
+
+// simplified polyfill for https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromAsync
+async function fromAsync<T>(iter: AsyncIterable<T>) {
+  const out: T[] = [];
+  for await (const val of iter) {
+    out.push(val);
+  }
+  return out;
+}
+
+function checkProgressAndGetResult<T>(updates: Update<T>[]) {
+  const first = updates.at(0);
+  const penultimate = updates.at(-2);
+  const last = updates.at(-1);
+  const allExceptLast = updates.slice(0, -1);
+
+  expect(allExceptLast.every(x => x.kind === 'progress')).toBeTruthy();
+  expect(first).toEqual({ kind: 'progress', progress: 0 });
+  expect(penultimate).toEqual({ kind: 'progress', progress: 1 });
+
+  assert(last != null && last.kind === 'success');
+
+  return last;
+}
+
+describe('bcrypt models', () => {
+  describe(bcryptWithProgressUpdates.name, () => {
+    test('with bcrypt hash function', async () => {
+      const updates = await fromAsync(bcryptWithProgressUpdates(hash, ['abc', 5]));
+      const result = checkProgressAndGetResult(updates);
+
+      expect(result.value).toMatch(/^\$2a\$05\$.{53}$/);
+      expect(result.timeTakenMs).toBeGreaterThan(0);
+    });
+
+    test('with bcrypt compare function', async () => {
+      const updates = await fromAsync(
+        bcryptWithProgressUpdates(compare, ['abc', '$2a$05$FHzYelm8Qn.IhGP.N8V1TOWFlRTK.8cphbxZSvSFo9B6HGscnQdhy']),
+      );
+      const result = checkProgressAndGetResult(updates);
+
+      expect(result.value).toBe(true);
+      expect(result.timeTakenMs).toBeGreaterThan(0);
+    });
+  });
+});