Ruby: add more tests for singleton up/down calls

Author: asgerf

ruby/ql/test/library-tests/modules/callgraph.expected

@@ -213,6 +213,10 @@ getTarget
 | calls.rb:549:2:549:6 | call to new | calls.rb:117:5:117:16 | new |
 | calls.rb:549:20:549:24 | call to baz | calls.rb:51:5:57:7 | baz |
 | calls.rb:550:26:550:37 | call to capitalize | calls.rb:97:5:97:23 | capitalize |
+| calls.rb:557:5:557:13 | call to singleton | calls.rb:553:5:554:7 | singleton |
+| calls.rb:560:9:560:17 | call to singleton | calls.rb:553:5:554:7 | singleton |
+| calls.rb:561:9:561:18 | call to singleton2 | calls.rb:565:5:566:7 | singleton2 |
+| calls.rb:568:5:568:14 | call to mid_method | calls.rb:559:5:562:7 | mid_method |
 | hello.rb:12:5:12:24 | call to include | calls.rb:108:5:110:7 | include |
 | hello.rb:14:16:14:20 | call to hello | hello.rb:2:5:4:7 | hello |
 | hello.rb:20:16:20:20 | call to super | hello.rb:13:5:15:7 | message |
@@ -335,6 +339,7 @@ unresolvedCall
 | calls.rb:549:1:549:26 | call to each |
 | calls.rb:550:1:550:13 | call to [] |
 | calls.rb:550:1:550:39 | call to each |
+| calls.rb:558:5:558:14 | call to singleton2 |
 | hello.rb:20:16:20:26 | ... + ... |
 | hello.rb:20:16:20:34 | ... + ... |
 | hello.rb:20:16:20:40 | ... + ... |
@@ -440,6 +445,9 @@ publicMethod
 | calls.rb:485:5:487:7 | singleton |
 | calls.rb:526:5:531:7 | baz |
 | calls.rb:539:5:542:7 | baz |
+| calls.rb:553:5:554:7 | singleton |
+| calls.rb:559:5:562:7 | mid_method |
+| calls.rb:565:5:566:7 | singleton2 |
 | hello.rb:2:5:4:7 | hello |
 | hello.rb:5:5:7:7 | world |
 | hello.rb:13:5:15:7 | message |

ruby/ql/test/library-tests/modules/calls.rb

@@ -548,3 +548,22 @@ def baz
 
 [C.new].each { |c| c.baz }
 ["a","b","c"].each { |s| s.capitalize }
+
+class SingletonUpCall_Base
+    def self.singleton
+    end
+end
+class SingletonUpCall_Sub < SingletonUpCall_Base
+    singleton
+    singleton2 # should not resolve
+    def self.mid_method
+        singleton
+        singleton2 # should resolve
+    end
+end
+class SingletonUpCall_SubSub < SingletonUpCall_Sub
+    def self.singleton2
+    end
+
+    mid_method
+end