add group to composition tests

tests/composition-test.scm

@@ -1,13 +1,14 @@
 (use test)
 (import ssql)
 
-(test "simple"
+(test-group "composition"
+  (test "simple"
     '(select (columns firstname lastname) (from artists) (where (= firstname "Frank")))
     (ssql-compose #f
                   '(select (columns firstname lastname) (from artists))
                   '((where (= firstname "Frank")))))
 
-(test "merge"
+  (test "merge"
     '(select (columns firstname lastname age) (from artists) (order firstname lastname))
     (ssql-compose #f '(select (columns firstname lastname) (order firstname))
-                '((columns age) (from artists) (order lastname))))
+                  '((columns age) (from artists) (order lastname)))))