Create test_hello_world.py

Author: zaihuaji

tests/test_hello_world.py

@@ -0,0 +1,11 @@
+# test_hello_world.py
+
+import pytest
+from rda_python_template.hello_world import get_string
+
+def test_get_string():
+    assert get_string('Bob') == 'Bob: Hello World!'
+
+def test_raises_exception_on_non_string_arguments():
+    with pytest.raises(TypeError):
+        get_string(9)