1 files changed, 38 insertions, 0 deletions
diff --git a/tools/deepl-translate.test.js b/tools/deepl-translate.test.js
new file mode 100644
index 0000000..39975d0
--- /dev/null
+++ b/tools/deepl-translate.test.js
@@ -0,0 +1,38 @@
+// names/translate.js translateDeepl: the reader's key goes to the right
+// DeepL host as a DeepL-Auth-Key header, only the prose is sent (links and
+// tags kept), the detected language comes back, and DeepL's refusals turn
+// into statuses the client can word (401 bad key, 402 quota).
+// Run: bun test tools/deepl-translate.test.js
+import { test, expect } from 'bun:test';
+import { translateDeepl } from '../names/translate.js';
+
+const fake = (status = 200, seen = []) => async (url, init) => {
+  const body = JSON.parse(init.body);
+  seen.push({ url, auth: init.headers.authorization, body });
+  if (status !== 200) return new Response('{}', { status });
+  return new Response(JSON.stringify({ translations: body.text.map((t) => ({ text: '[it] ' + t, detected_source_language: 'EN' })) }), { status: 200 });
+};
+
+test('a free key goes to api-free, as DeepL-Auth-Key, prose only', async () => {
+  const seen = [];
+  const out = await translateDeepl('Good morning everyone, look at this https://example.com/a.png #nostr', 'it', 'abcdef01-2345-6789-abcd-ef0123456789:fx', fake(200, seen));
+  expect(seen[0].url).toBe('https://api-free.deepl.com/v2/translate');
+  expect(seen[0].auth).toBe('DeepL-Auth-Key abcdef01-2345-6789-abcd-ef0123456789:fx');
+  expect(seen[0].body.target_lang).toBe('IT');
+  expect(seen[0].body.text.join(' ')).not.toContain('https://');
+  expect(out.source).toBe('en');
+  expect(out.text).toContain('[it] ');
+  expect(out.text).toContain('https://example.com/a.png');
+  expect(out.text).toContain('#nostr');
+});
+test('a paid key goes to api.deepl.com; English means EN-US', async () => {
+  const seen = [];
+  await translateDeepl('Buongiorno a tutti, come state oggi?', 'en', 'abcdef01-2345-6789-abcd-ef0123456780', fake(200, seen));
+  expect(seen[0].url).toBe('https://api.deepl.com/v2/translate');
+  expect(seen[0].body.target_lang).toBe('EN-US');
+});
+test('refusals: bad key 401, quota 402', async () => {
+  await expect(translateDeepl('Hello there my friends, how are you', 'it', 'abcdef01-2345-6789-abcd-ef0123456781:fx', fake(403))).rejects.toMatchObject({ status: 401 });
+  await expect(translateDeepl('Hello there my friends, how are you all', 'it', 'abcdef01-2345-6789-abcd-ef0123456781:fx', fake(456))).rejects.toMatchObject({ status: 402 });
+  await expect(translateDeepl('Hello', 'it', 'not a key')).rejects.toMatchObject({ status: 401 });
+});