Fix tests by stubbing relevant os functions.

Author: taus-semmle

python/ql/test/query-tests/Security/CWE-377/InsecureTemporaryFile.expected

@@ -1 +1,3 @@
 | InsecureTemporaryFile.py:5:16:5:23 | ControlFlowNode for mktemp() | Call to deprecated function $@.$@ may be insecure. | tempfile | mktemp |
+| InsecureTemporaryFile.py:11:16:11:27 | ControlFlowNode for Attribute() | Call to deprecated function $@.$@ may be insecure. | os | tempnam |
+| InsecureTemporaryFile.py:17:16:17:26 | ControlFlowNode for Attribute() | Call to deprecated function $@.$@ may be insecure. | os | tmpnam |

python/ql/test/query-tests/Security/CWE-377/options

@@ -0,0 +1,2 @@
+semmle-extractor-options: -p ../lib/ --max-import-depth=3
+optimize: true

python/ql/test/query-tests/Security/lib/os/__init__.py

@@ -9,3 +9,9 @@ def chmod(path, mode):
 
 def open(path, flags, mode):
     pass
+
+def tempnam(*args):
+    pass
+
+def tmpnam(*args):
+    pass