Ruby: add test

Author: hmac

ruby/ql/test/library-tests/dataflow/barrier-guards/barrier-guards.expected

@@ -325,10 +325,13 @@ controls
 | barrier-guards.rb:250:4:250:8 | "foo" | barrier-guards.rb:272:5:272:7 | foo | match |
 | barrier-guards.rb:250:4:250:8 | "foo" | barrier-guards.rb:277:1:279:3 | if ... | match |
 | barrier-guards.rb:250:4:250:8 | "foo" | barrier-guards.rb:278:5:278:7 | foo | match |
+| barrier-guards.rb:250:4:250:8 | "foo" | barrier-guards.rb:282:1:284:3 | if ... | match |
+| barrier-guards.rb:250:4:250:8 | "foo" | barrier-guards.rb:283:5:283:7 | foo | match |
 | barrier-guards.rb:254:4:254:28 | ... == ... | barrier-guards.rb:255:5:255:7 | foo | true |
 | barrier-guards.rb:259:4:259:16 | ... == ... | barrier-guards.rb:260:5:260:7 | foo | true |
 | barrier-guards.rb:264:4:264:16 | ... == ... | barrier-guards.rb:265:5:265:7 | foo | true |
 | barrier-guards.rb:268:1:268:12 | ... == ... | barrier-guards.rb:268:17:268:19 | foo | true |
 | barrier-guards.rb:269:1:269:3 | foo | barrier-guards.rb:269:8:269:10 | foo | true |
 | barrier-guards.rb:271:4:271:19 | call to include? | barrier-guards.rb:272:5:272:7 | foo | true |
 | barrier-guards.rb:277:4:277:20 | call to include? | barrier-guards.rb:278:5:278:7 | foo | true |
+| barrier-guards.rb:282:4:282:20 | call to include? | barrier-guards.rb:283:5:283:7 | foo | true |

ruby/ql/test/library-tests/dataflow/barrier-guards/barrier-guards.rb

@@ -277,3 +277,8 @@
 if foos.include? foo
     foo # $ guarded
 end
+
+foos = [f, g, some_method_call]
+if foos.include? foo
+    foo
+end