Add es_NI test

Signed-off-by: William José Moreno Reyes <williamjmorenor@gmail.com>

tests/test_es_ni.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2003, Taro Ogawa.  All Rights Reserved.
+# Copyright (c) 2013, Savoir-faire Linux inc.  All Rights Reserved.
+
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301 USA
+
+from __future__ import unicode_literals
+
+from num2words import num2words
+
+from . import test_es
+
+TEST_NIO = (
+    (1.0, 'un córdoba con cero centavos'),
+    (2.0, 'dos córdobas con cero centavos'),
+    (8.0, 'ocho córdobas con cero centavos'),
+    (12.0, 'doce córdobas con cero centavos'),
+    (21.0, 'veintiun córdobas con cero centavos'),
+    (81.25, 'ochenta y un córdobas con veinticinco centavos'),
+    (100.00, 'cien córdobas con cero centavos'),
+)
+
+
+class Num2WordsESNITest(test_es.Num2WordsESTest):
+
+    def test_currency(self):
+        for test in TEST_NIO:
+            self.assertEqual(
+                num2words(test[0], lang='es_NI', to='currency'),
+                test[1]
+            )