hello.py: Add unit test

Author: 0cjs

Test

@@ -3,4 +3,4 @@
 basedir=$(cd "$(dirname "$0")" && pwd -P)
 
 cd "$basedir"
-python hello.py
+pytest hello.py

hello.py

@@ -1 +1,8 @@
-print("Hello, world.")
+def hello(name):
+    return 'Hello, {}.'.format(name)
+
+def test_hello():
+    assert 'Hello, Fred.' == hello('Fred')
+
+if __name__ == '__main__':
+    print(hello('Taro'))