Add new tests and refactor existing ones

resolve #86 and #87

tests/deepLGetLanguages.test.ts

@@ -0,0 +1,35 @@
+import { deepLGetLanguages } from '../src/sheetsl';
+
+describe('deepLGetLanguages', () => {
+  beforeEach(() => {
+    global.UrlFetchApp = {
+      fetch: jest.fn(() => ({
+        getContentText: jest.fn(() =>
+          JSON.stringify({
+            languages: [
+              { language: 'EN', name: 'English', supportsFormality: true },
+              { language: 'DE', name: 'German', supportsFormality: true },
+            ],
+          }),
+        ),
+        getResponseCode: jest.fn(() => 200),
+      })),
+    } as unknown as GoogleAppsScript.URL_Fetch.UrlFetchApp;
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        getProperty: jest.fn(() => 'SampleApiKey:fx'),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+  });
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+  it('should return the list of supported languages', () => {
+    expect(deepLGetLanguages()).toEqual({
+      languages: [
+        { language: 'EN', name: 'English', supportsFormality: true },
+        { language: 'DE', name: 'German', supportsFormality: true },
+      ],
+    });
+  });
+});

tests/deleteDeeplApiKey.test.ts

@@ -0,0 +1,41 @@
+import { deleteDeeplApiKey } from '../src/sheetsl';
+
+describe('deleteDeeplApiKey', () => {
+  beforeEach(() => {
+    class MockUi {
+      // eslint-disable-next-line @typescript-eslint/no-empty-function
+      constructor() {}
+      alert: jest.Mock = jest.fn();
+    }
+    global.SpreadsheetApp = {
+      getUi: jest.fn(() => new MockUi() as unknown as GoogleAppsScript.Base.Ui),
+    } as unknown as GoogleAppsScript.Spreadsheet.SpreadsheetApp;
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
+    jest.spyOn(console, 'error').mockImplementation(() => {});
+  });
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+  it('should successfully delete the DeepL API key', () => {
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        deleteProperty: jest.fn(),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+    deleteDeeplApiKey();
+    expect(PropertiesService.getUserProperties).toHaveBeenCalled();
+    expect(console.error).not.toHaveBeenCalled();
+  });
+  it('should catch an error if something went wrong', () => {
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        deleteProperty: jest.fn(() => {
+          throw new Error('Test error');
+        }),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+    deleteDeeplApiKey();
+    expect(PropertiesService.getUserProperties).toHaveBeenCalled();
+    expect(console.error).toHaveBeenCalled();
+  });
+});

tests/getBlobBytes.test.ts

@@ -0,0 +1,15 @@
+import { getBlobBytes } from '../src/sheetsl';
+
+global.Utilities = {
+  newBlob: jest.fn((text: string) => ({
+    getBytes: jest.fn(() => ({
+      length: text.length,
+    })),
+  })),
+} as unknown as GoogleAppsScript.Utilities.Utilities;
+
+describe('getBlobBytes', () => {
+  it('should return the length of the given string in bytes', () => {
+    expect(getBlobBytes('test string')).toBe(11);
+  });
+});

tests/getDeepLApiKey.test.ts

@@ -1,21 +1,29 @@
 import { getDeepLApiKey } from '../src/sheetsl';
 
-const ADDON_NAME = 'SheetsL';
-
-PropertiesService.getUserProperties = jest.fn(() => ({
-  getProperty: jest.fn(() => undefined),
-})) as any;
-
-const testObj = {
-  title:
-    'Case when DeepL API Authentication Key is not saved in the user property',
-  errorMessage: `[${ADDON_NAME}] API Key Unavailable: Set the DeepL API Authentication Key from the Settings > Set Auth Key of the add-on menu.`,
-};
-
-describe('getDeepLApiKey Error', () => {
-  test(testObj.title, () => {
-    expect(() => {
-      getDeepLApiKey();
-    }).toThrowError(new Error(testObj.errorMessage));
+describe('getDeepLApiKey', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+  it('should get the DeepL API key from the user properties and return it', () => {
+    const mockApiKey = 'Sample-API-key:fx';
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        getProperty: jest.fn(() => mockApiKey),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+    const result = getDeepLApiKey();
+    expect(result).toBe(mockApiKey);
+  });
+  it('should throw an error if the DeepL API key is not saved in the user properties', () => {
+    global.PropertiesService = {
+      getUserProperties: jest.fn(() => ({
+        getProperty: jest.fn(() => null),
+      })),
+    } as unknown as GoogleAppsScript.Properties.PropertiesService;
+    expect(() => getDeepLApiKey()).toThrow(
+      new Error(
+        '[SheetsL] API Key Unavailable: Set the DeepL API Authentication Key from the Settings > Set Auth Key of the add-on menu.',
+      ),
+    );
   });
 });