diff --git a/namekoplus/tests/unit/test_service.py b/namekoplus/tests/unit/test_service.py
index e595e58..6bff988 100644
--- a/namekoplus/tests/unit/test_service.py
+++ b/namekoplus/tests/unit/test_service.py
@@ -2,10 +2,19 @@
 Service unit testing best practice.
 """
 
+import pytest
 from nameko.testing.services import worker_factory
 
 
-def test_example_service():
+@pytest.mark.parametrize(
+    'value, expected',
+    [
+        ('John Doe', 'Hello, John Doe!'),
+        ('', 'Hello, !'),
+        ('Bryant', 'Hello, Bryant!'),
+    ],
+)
+def test_example_service(value, expected):
     """
     Test example service.
     """
@@ -16,5 +25,5 @@ def test_example_service():
     service.remote.hello.side_effect = lambda name: "Hello, {}!".format(name)
 
     # test remote_hello business logic
-    assert service.remote_hello("Bryant") == "Hello, Bryant!"
-    service.remote.hello.assert_called_once_with("Bryant")
\ No newline at end of file
+    assert service.remote_hello(value) == expected
+    service.remote.hello.assert_called_once_with(value)
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 35820a9..f3c62c7 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@ with open(path.join(here, 'README.md'), encoding='utf-8') as f:
 
 setup(
     name='namekoplus',
-    version='0.3.0',
+    version='0.3.1',
     description='A lightweight Python distributed microservice solution',
     long_description=long_description,
     long_description_content_type='text/markdown',