Python: Add test-cases using keyword arguments for builtin function

Author: RasmusWL

python/ql/test/library-tests/PointsTo/calls/CallPointsTo.expected

@@ -13,3 +13,5 @@
 | 40 | ControlFlowNode for f() | Function f |
 | 41 | ControlFlowNode for C() | class C |
 | 42 | ControlFlowNode for Attribute() | Method(Function C.n, C()) |
+| 45 | ControlFlowNode for open() | Builtin-function open |
+| 46 | ControlFlowNode for open() | Builtin-function open |

python/ql/test/library-tests/PointsTo/calls/GetACall.expected

@@ -17,3 +17,5 @@
 | 41 | ControlFlowNode for C() | class C |
 | 42 | ControlFlowNode for Attribute() | Function C.n |
 | 42 | ControlFlowNode for Attribute() | Method(Function C.n, C()) |
+| 45 | ControlFlowNode for open() | Builtin-function open |
+| 46 | ControlFlowNode for open() | Builtin-function open |

python/ql/test/library-tests/PointsTo/calls/getArgumentForCall.expected

@@ -26,3 +26,5 @@
 | 42 | ControlFlowNode for Attribute() | Function C.n | 0 | ControlFlowNode for c |
 | 42 | ControlFlowNode for Attribute() | Function C.n | 1 | ControlFlowNode for IntegerLiteral |
 | 42 | ControlFlowNode for Attribute() | Method(Function C.n, C()) | 0 | ControlFlowNode for IntegerLiteral |
+| 45 | ControlFlowNode for open() | Builtin-function open | 0 | ControlFlowNode for Str |
+| 45 | ControlFlowNode for open() | Builtin-function open | 1 | ControlFlowNode for Str |

python/ql/test/library-tests/PointsTo/calls/test.py

@@ -40,3 +40,7 @@ def foo(arg):
 f(arg0=0, arg1=1, arg2=2)
 c = C()
 c.n(arg1=1)
+
+# positional/keyword arguments for a builtin function
+open("foo.txt", "rb") # TODO: Not handled by getNamedArgumentForCall
+open(file="foo.txt", mode="rb") # TODO: Not handled by either getNamedArgumentForCall or getArgumentForCall