hello world tests via updated x-common data

re: exercism/problem-specifications#520

exercises/hello-world/.meta/.version

@@ -1 +1 @@
-1
+2

exercises/hello-world/hello_world_test.rb

@@ -12,23 +12,11 @@
   exit 1
 end
 
-# Test data version:
-# deb225e Implement canonical dataset for scrabble-score problem (#255)
-
+# Common test data version: 4b9ae53
 class HelloWorldTest < Minitest::Test
-  def test_no_name
+  def test_hello
     assert_equal 'Hello, World!', HelloWorld.hello
   end
-
-  def test_sample_name
-    skip
-    assert_equal 'Hello, Alice!', HelloWorld.hello('Alice')
-  end
-
-  def test_other_sample_name
-    skip
-    assert_equal 'Hello, Bob!', HelloWorld.hello('Bob')
-  end
 end
 
 __END__

lib/hello_world_cases.rb

@@ -2,11 +2,11 @@
 
 class HelloWorldCase < OpenStruct
   def test_name
-    'test_%s' % description.gsub(/[ -]/, '_')
+    'test_%s' % property.gsub(/[ -]/, '_')
   end
 
   def do
-    defined?(name) ? "HelloWorld.hello('#{name}')" : 'HelloWorld.hello'
+    'HelloWorld.hello'
   end
 
   def skipped?