Adds check for translated text

Author: gguuss

translation/samples/snippets/snippets_test.py

@@ -44,3 +44,5 @@ def test_translate_text(capsys):
 def test_translate_utf8(capsys):
     text = '나는 파인애플을 좋아한다.'
     snippets.translate_text('en', text)
+    out, _ = capsys.readouterr()
+    assert 'I like pineapple.' in out