Changes the test methods' declaration

I don't know if it's important but i believe it's at least interesting. How about have a pattern for test methods' declaration? These past days i'm reading and studying about tests in Rails applications, and looking at the tests created here in Rails' repository, despite a pattern has not been implemented, the declaration 
```ruby
test "some test declaration" do
 assert true
end
```
is more frequent that
```ruby
def test_some_test_declaration
 assert true
end
```
Like a said, i don't know if it's important, but could be interesting.

i changed
```ruby
def test_some_test_declaration
  assert true
end
````
to
```ruby
test "some test declaration" do
  assert true
end
```