Merge branch 'shubhanjan99-master'

Author: nfriedly

test/unit/test.tone_analyzer.v3.js

@@ -79,6 +79,23 @@ describe('tone_analyzer.v3', function() {
     assert.equal(req.headers['accept'], 'application/json');
   });
 
+  it('tone API should add optional language parameter', function() {
+    const options = {
+      text: tone_request.text,
+      tones: 'emotion',
+      sentences: true,
+      language: 'en'
+    };
+    const req = tone_analyzer.tone(options, noop);
+    const body = Buffer.from(req.body).toString('ascii');
+    assert.equal(req.uri.href, service.url + tone_path + '?version=2016-05-19&tones=emotion&sentences=true');
+    assert.equal(body, tone_request.text);
+    assert.equal(req.method, 'POST');
+    assert.equal(req.headers['content-type'], 'text/plain');
+    assert.equal(req.headers['accept'], 'application/json');
+    assert.equal(req.headers['content-language'], 'en');
+  });
+
   it('tone API should set HTML content-type', function() {
     const options = { text: tone_request.text, isHTML: true };
     const req = tone_analyzer.tone(options, noop);

tone-analyzer/v3.js

@@ -57,6 +57,7 @@ ToneAnalyzerV3.URL = 'https://gateway.watsonplatform.net/tone-analyzer/api';
  * - `isHTML`: A boolean value telling that the `params.text` argument is
  *    to be trated as HTML contents. On HTML input, the services does
  *    cleanup of tags and performs the analysis on the text contents only.
+ * - `language`: Language of the input. It defaults to `en`.
  *
  * @return upon success, the callback function is called with an object
  * containing the different tones (emotion, writing and social) analyzed.
@@ -70,6 +71,16 @@ ToneAnalyzerV3.prototype.tone = function(params, callback) {
     return;
   }
   const contentType = params.isHTML ? 'text/html' : 'text/plain';
+
+  const headers = {
+    accept: 'application/json',
+    'content-type': contentType
+  };
+
+  if (params.language) {
+    headers['content-language'] = params.language;
+  }
+
   const parameters = {
     options: {
       url: '/v3/tone',
@@ -78,10 +89,7 @@ ToneAnalyzerV3.prototype.tone = function(params, callback) {
       qs: pick(params, ['tones', 'sentences'])
     },
     defaultOptions: extend(true, this._options, {
-      headers: {
-        accept: 'application/json',
-        'content-type': contentType
-      }
+      headers: headers
     })
   };