Java: Make a testcase for wrappers of sources.

Author: michaelnebel

java/ql/test/utils/model-generator/CaptureSourceModels.expected

@@ -2,3 +2,4 @@
 | p;Sources;true;socketStream;();;ReturnValue;remote |
 | p;Sources;true;sourceToParameter;(InputStream[],List);;Argument[0].ArrayElement;remote |
 | p;Sources;true;sourceToParameter;(InputStream[],List);;Argument[1].Element;remote |
+| p;Sources;true;wrappedSocketStream;();;ReturnValue;remote |

java/ql/test/utils/model-generator/p/Sources.java

@@ -19,6 +19,10 @@ public InputStream socketStream() throws IOException {
         return socket.accept().getInputStream();
     }
 
+    public InputStream wrappedSocketStream() throws IOException {
+        return socketStream();
+    }
+
     public void sourceToParameter(InputStream[] streams, List<InputStream> otherStreams) throws IOException {
         ServerSocket socket = new ServerSocket(123);
         streams[0] = socket.accept().getInputStream();