CFG: add test-case for conditional method declarations

ql/test/library-tests/controlflow/graph/Cfg.expected

@@ -73,6 +73,9 @@ heredoc.rb:
 #-----|  -> <<A
 
 ifs.rb:
+#    1| enter top-level
+#-----|  -> 1
+
 #    1| enter m1
 #-----|  -> x
 
@@ -88,6 +91,9 @@ ifs.rb:
 #   32| enter m5
 #-----|  -> b1
 
+#   36| enter conditional_method_def
+#-----|  -> String
+
 loops.rb:
 #    1| enter m1
 #-----|  -> x
@@ -2265,6 +2271,31 @@ ifs.rb:
 #   33| String
 #-----|  -> If
 
+#   36| UnlessModifier
+#-----|  -> exit top-level (normal)
+
+#   36| conditional_method_def
+#-----|  -> UnlessModifier
+
+#   37| MethodCall
+#-----|  -> exit conditional_method_def (normal)
+
+#   37| puts
+#-----|  -> MethodCall
+
+#   37| String
+#-----|  -> puts
+
+#   38| Binary
+#-----| true -> UnlessModifier
+#-----| false -> conditional_method_def
+
+#   38| 1
+#-----|  -> 2
+
+#   38| 2
+#-----|  -> Binary
+
 loops.rb:
 #    1| x
 #-----|  -> While
@@ -3404,6 +3435,8 @@ heredoc.rb:
 #    1| exit double_heredoc
 
 ifs.rb:
+#    1| exit top-level
+
 #    1| exit m1
 
 #   11| exit m2
@@ -3414,6 +3447,8 @@ ifs.rb:
 
 #   32| exit m5
 
+#   36| exit conditional_method_def
+
 loops.rb:
 #    1| exit m1
 
@@ -3533,6 +3568,9 @@ heredoc.rb:
 #-----|  -> exit double_heredoc
 
 ifs.rb:
+#    1| exit top-level (normal)
+#-----|  -> exit top-level
+
 #    1| exit m1 (normal)
 #-----|  -> exit m1
 
@@ -3548,6 +3586,9 @@ ifs.rb:
 #   32| exit m5 (normal)
 #-----|  -> exit m5
 
+#   36| exit conditional_method_def (normal)
+#-----|  -> exit conditional_method_def
+
 loops.rb:
 #    1| exit m1 (normal)
 #-----|  -> exit m1

ql/test/library-tests/controlflow/graph/ifs.rb

@@ -31,4 +31,8 @@ end
 
 def m5 (b1, b2, b3, b4, b5)
   if (if b1 then b2 elsif b3 then b4 else b5 end) then "b2 || b4 || b5" else "!b2 || !b4 || !b5" end
-end
+end
+
+def conditional_method_def()
+  puts "bla"
+end unless 1 == 2