Create deepLTranslate.test.ts

tests/deepLTranslate.test.ts

@@ -0,0 +1,86 @@
+import { deepLTranslate } from '../src/sheetsl';
+
+describe('deepLTranslate', () => {
+  beforeEach(() => {
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        getProperty: jest.fn(() => 'SampleApiKey:fx'),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+    global.encodeURIComponent = jest.fn(
+      (text: string) => text,
+    ) as unknown as typeof encodeURIComponent;
+  });
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+  const mockSourceObjects = [
+    {
+      note: 'with source language specified',
+      sourceLang: 'EN-US',
+      targetLang: 'DE',
+      sourceText: 'Hello, World!',
+      translatedText: 'Hallo, Welt!',
+    },
+    {
+      note: 'without source language specified',
+      sourceLang: null,
+      targetLang: 'DE',
+      sourceText: 'Hello, World!',
+      translatedText: 'Hallo, Welt!',
+    },
+    {
+      note: 'in an array of strings',
+      sourceLang: null,
+      targetLang: 'DE',
+      sourceText: ['Hello, World!', 'Hello, World!'],
+      translatedText: ['Hallo, Welt!', 'Hallo, Welt!'],
+    },
+  ];
+  it.each(mockSourceObjects)(
+    'should translate text $note',
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    ({ note, sourceLang, targetLang, sourceText, translatedText }) => {
+      global.UrlFetchApp = {
+        fetch: jest.fn(() => ({
+          getContentText: jest.fn(() =>
+            JSON.stringify({
+              translations: Array.isArray(translatedText)
+                ? translatedText.map((text) => ({ text: text }))
+                : [{ text: translatedText }],
+            }),
+          ),
+          getResponseCode: jest.fn(() => 200),
+        })),
+      } as unknown as GoogleAppsScript.URL_Fetch.UrlFetchApp;
+      const translated = deepLTranslate(sourceText, sourceLang, targetLang);
+      expect(translated).toStrictEqual(
+        Array.isArray(translatedText) ? translatedText : [translatedText],
+      );
+      expect(global.UrlFetchApp.fetch).toHaveBeenCalled();
+    },
+  );
+  const mockSourceObjectsError = [
+    {
+      note: 'when source text is null',
+      sourceLang: 'EN-US',
+      targetLang: 'DE',
+      sourceText: null,
+    },
+    {
+      note: 'when source text is empty',
+      sourceLang: 'EN-US',
+      targetLang: 'DE',
+      sourceText: '',
+    },
+  ];
+  it.each(mockSourceObjectsError)(
+    'should throw an error $note',
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    ({ note, sourceLang, targetLang, sourceText }) => {
+      expect(() => deepLTranslate(sourceText, sourceLang, targetLang)).toThrow(
+        new Error('[SheetsL] Empty input.'),
+      );
+    },
+  );
+});