add jest

lib/id.test.ts

@@ -0,0 +1,28 @@
+import { getId } from './id'
+
+const defaultDoc = {
+  address: 'Max Mustermann\nMusterstrasse\n12345 Musterstadt',
+  body: 'Inhalt des Briefs',
+  closing: 'Mit freundlichen Grüßen',
+  customer: '',
+  date: new Date('2021-01-01').toLocaleDateString('de-DE'),
+  enclosing: '',
+  invoice: '',
+  myRef: '',
+  opening: 'Sehr geehrte Damen und Herren',
+  ps: '',
+  signature: '',
+  specialMail: '',
+  subject: 'Betreffzeile',
+  letterOption: 'brief-fam',
+  yourMail: '',
+  yourRef: '',
+  yourRefName: '',
+}
+
+describe('getId', () => {
+  it('generates id for default doc', () => {
+    const id = getId(defaultDoc)
+    expect(id).toEqual('836fbb708bb6807db39ba06332b559d44063e8ba')
+  })
+})