test: Enable style and tone test for mock server and real server

Author: leoncheng57

tests/rephraseText.test.ts

@@ -50,11 +50,10 @@ describe('rephrase text', () => {
         );
     });
 
-    // TODO: update mock to return error if style and tone are provided
-    withRealServer('should throw an error if both style and tone are provided', async () => {
+    it('should throw an error if both style and tone are provided', async () => {
         const deeplClient = makeDeeplClient();
         const deeplClientPromise = deeplClient.rephraseText(
-            exampleText.de,
+            exampleText.en,
             'en',
             WritingStyle.BUSINESS,
             WritingTone.CONFIDENT,
@@ -63,6 +62,45 @@ describe('rephrase text', () => {
         await expect(deeplClientPromise).rejects.toThrow(/Both writing_style and tone defined/);
     });
 
+    it('should return success if style is default and tone is provided', async () => {
+        const deeplClient = makeDeeplClient();
+        const rephraseResponse = await deeplClient.rephraseText(
+            exampleText.en,
+            'en',
+            WritingStyle.DEFAULT,
+            WritingTone.CONFIDENT,
+        );
+        expect(rephraseResponse.text).toBeDefined();
+        expect(rephraseResponse.detectedSourceLang).toBeDefined();
+        expect(rephraseResponse.targetLang).toBe('en-US');
+    });
+
+    it('should return success if style is provided and tone is default', async () => {
+        const deeplClient = makeDeeplClient();
+        const rephraseResponse = await deeplClient.rephraseText(
+            exampleText.de,
+            'en',
+            WritingStyle.ACADEMIC,
+            WritingTone.DEFAULT,
+        );
+        expect(rephraseResponse.text).toBeDefined();
+        expect(rephraseResponse.detectedSourceLang).toBeDefined();
+        expect(rephraseResponse.targetLang).toBe('en-US');
+    });
+
+    it('should return success if both style and tone are not provided', async () => {
+        const deeplClient = makeDeeplClient();
+        const rephraseResponse = await deeplClient.rephraseText(
+            exampleText.de,
+            'en',
+            null,
+            undefined,
+        );
+        expect(rephraseResponse.text).toBeDefined();
+        expect(rephraseResponse.detectedSourceLang).toBeDefined();
+        expect(rephraseResponse.targetLang).toBe('en-US');
+    });
+
     it(
         'should rephrase with style and tone',
         async () => {