--- a/langtools/src/jdk.jshell/share/classes/jdk/jshell/SourceCodeAnalysisImpl.java	Fri Mar 31 08:59:35 2017 +0200
+++ b/langtools/src/jdk.jshell/share/classes/jdk/jshell/SourceCodeAnalysisImpl.java	Fri Mar 31 10:46:37 2017 +0200
@@ -1277,12 +1277,16 @@
                  .allMatch(param -> param.getSimpleName().toString().startsWith("arg"));
     }
 
+    private static List<Path> availableSourcesOverride; //for tests
     private List<Path> availableSources;
 
     private List<Path> findSources() {
         if (availableSources != null) {
             return availableSources;
         }
+        if (availableSourcesOverride != null) {
+            return availableSources = availableSourcesOverride;
+        }
         List<Path> result = new ArrayList<>();
         Path home = Paths.get(System.getProperty("java.home"));
         Path srcZip = home.resolve("lib").resolve("src.zip");