function deleteCos, added

src/index.js

@@ -592,6 +592,13 @@ class ZimbraAdminApi {
     return this.remove('Domain', resource_data, callback);
   }
 
+  deleteCos(id_cos, callback){
+    const request_data = this.buildRequestData('DeleteCos', callback);
+    request_data.parse_response = ResponseParser.emptyResponse;
+    request_data.params.params = { 'id': {'_content': id_cos}};
+    return this.performRequest(request_data);
+  }
+
   removeDomainAdmin(domain, account_id, coses, callback) {
     this.getDomain(domain, (err, domain) => {
       if (err) return callback(err);

test/test.js

@@ -841,6 +841,21 @@ var zimbraAdminPassword = process.env.ZIMBRA_PASSWORD || '12345678';
       });
     })
 
+    it.only('Should delete COS "unknow" ', function(done){
+      let api = new ZimbraAdminApi(auth_data);
+      api.getCos("unknow", function(err, cos){
+        if (err) return console.error(err);
+        let cosId = cos.id;
+        console.log(cosId);
+        api.deleteCos(cosId, function(err, res){
+          if (err) return console.error(err);
+          console.log(res);
+          expect(err).to.be.null;
+          done();
+        })
+      });
+    })
+
 
   });