Add API graph test that exhibits a missing edge

Author: hvitved

ql/test/library-tests/dataflow/api-graphs/test1.rb

@@ -22,3 +22,10 @@
 
 FooAlias = Foo #$ use=getMember("Foo")
 FooAlias::Bar::Baz #$ use=getMember("Foo").getMember("Bar").getMember("Baz")
+
+module Outer
+    module Inner
+    end
+end
+
+Outer::Inner.foo #$ use=getMember("Outer").getMember("Inner").getReturn("foo")

ql/test/library-tests/dataflow/api-graphs/use.expected

@@ -0,0 +1,2 @@
+| test1.rb:31:1:31:5 | Outer | Unexpected result: use=getMember("Outer") |
+| test1.rb:31:18:31:78 | #$ use=getMember("Outer").getMember("Inner").getReturn("foo") | Missing result:use=getMember("Outer").getMember("Inner").getReturn("foo") |