Python: add test for fields

Author: yoff

python/ql/test/experimental/dataflow/validTest.py

@@ -75,6 +75,7 @@ def check_tests_valid_after_version(testFile, version):
     check_tests_valid("variable-capture.test_collections")
     check_tests_valid("variable-capture.by_value")
     check_tests_valid("variable-capture.test_library_calls")
+    check_tests_valid("variable-capture.test_fields")
     check_tests_valid("module-initialization.multiphase")
     check_tests_valid("fieldflow.test")
     check_tests_valid("fieldflow.test_dict")

python/ql/test/experimental/dataflow/variable-capture/test_fields.py

@@ -0,0 +1,51 @@
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname((__file__))))
+from testlib import expects
+
+# These are defined so that we can evaluate the test code.
+NONSOURCE = "not a source"
+SOURCE = "source"
+
+def is_source(x):
+    return x == "source" or x == b"source" or x == 42 or x == 42.0 or x == 42j
+
+
+def SINK(x):
+    if is_source(x):
+        print("OK")
+    else:
+        print("Unexpected flow", x)
+
+
+def SINK_F(x):
+    if is_source(x):
+        print("Unexpected flow", x)
+    else:
+        print("OK")
+
+class MyObj(object):
+    def setFoo(self, foo):
+        self.foo = foo
+
+    def getFoo(self):
+        return self.foo
+
+@expects(3)
+def test_captured_field():
+    foo = MyObj()
+    foo.setFoo(NONSOURCE)
+
+    def test():
+        SINK(foo.getFoo()) #$ captured
+
+    def read():
+        return foo.getFoo()
+
+    SINK_F(read())
+
+    foo.setFoo(SOURCE)
+    test()
+
+    SINK(read()) #$ captured