Python: Move dataflow tests out of experimental

python/ql/test/library-tests/dataflow/coverage-py2/argumentRoutingTest.expected

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+testFailures
+failures

python/ql/test/library-tests/dataflow/coverage-py2/argumentRoutingTest.qlref

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+../coverage/argumentRoutingTest.ql

python/ql/test/library-tests/dataflow/coverage-py2/classes.py

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+# Python 2 specific tests, like the one in coverage/classes.py
+#
+# User-defined methods, both instance methods and class methods, can be called in many non-standard ways
+# i.e. differently from simply `c.f()` or `C.f()`. For example, a user-defined `__await__` method on a
+# class `C` will be called by the syntactic construct `await c` when `c` is an instance of `C`.
+#
+# These tests should cover all the class calls that we hope to support.
+# It is based on https://docs.python.org/3/reference/datamodel.html, and headings refer there.
+#
+# All functions starting with "test_" should run and execute `print("OK")` exactly once.
+# This can be checked by running validTest.py.
+
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname((__file__))))
+from testlib import expects
+
+
+def SINK1(x):
+    pass
+
+
+def SINK2(x):
+    pass
+
+
+def SINK3(x):
+    pass
+
+
+def SINK4(x):
+    pass
+
+
+def OK():
+    print("OK")
+
+
+# 3.3.8. Emulating numeric types
+
+# object.__index__(self)
+class With_index:
+    def __index__(self):
+        SINK1(self)
+        OK()  # Call not found
+        return 0
+
+
+def test_index():
+    import operator
+
+    with_index = With_index()  #$ MISSING: arg1="SSA variable with_index" func=With_index.__index__
+    operator.index(with_index)

python/ql/test/library-tests/dataflow/coverage-py2/options

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+semmle-extractor-options: --max-import-depth=1 --lang=2