Add coverage

tools/telemetry/third_party/coverage/tests/try_execfile.py

+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+"""Test file for run_python_file.
+
+This file is executed two ways::
+
+    $ coverage run try_execfile.py
+
+and::
+
+    $ python try_execfile.py
+
+The output is compared to see that the program execution context is the same
+under coverage and under Python.
+
+It is not crucial that the execution be identical, there are some differences
+that are OK.  This program canonicalizes the output to gloss over those
+differences and get a clean diff.
+
+"""
+
+import json, os, sys
+
+# sys.path varies by execution environments.  Coverage.py uses setuptools to
+# make console scripts, which means pkg_resources is imported.  pkg_resources
+# removes duplicate entries from sys.path.  So we do that too, since the extra
+# entries don't affect the running of the program.
+
+def same_file(p1, p2):
+    """Determine if `p1` and `p2` refer to the same existing file."""
+    if not p1:
+        return not p2
+    if not os.path.exists(p1):
+        return False
+    if not os.path.exists(p2):
+        return False
+    if hasattr(os.path, "samefile"):
+        return os.path.samefile(p1, p2)
+    else:
+        norm1 = os.path.normcase(os.path.normpath(p1))
+        norm2 = os.path.normcase(os.path.normpath(p2))
+        return norm1 == norm2
+
+def without_same_files(filenames):
+    """Return the list `filenames` with duplicates (by same_file) removed."""
+    reduced = []
+    for filename in filenames:
+        if not any(same_file(filename, other) for other in reduced):
+            reduced.append(filename)
+    return reduced
+
+cleaned_sys_path = [os.path.normcase(p) for p in without_same_files(sys.path)]
+
+DATA = "xyzzy"
+
+import __main__
+
+def my_function(a):
+    """A function to force execution of module-level values."""
+    return "my_fn(%r)" % a
+
+FN_VAL = my_function("fooey")
+
+loader = globals().get('__loader__')
+fullname = getattr(loader, 'fullname', None) or getattr(loader, 'name', None)
+
+globals_to_check = {
+    '__name__': __name__,
+    '__file__': __file__,
+    '__doc__': __doc__,
+    '__builtins__.has_open': hasattr(__builtins__, 'open'),
+    '__builtins__.dir': dir(__builtins__),
+    '__loader__ exists': loader is not None,
+    '__loader__.fullname': fullname,
+    '__package__': __package__,
+    'DATA': DATA,
+    'FN_VAL': FN_VAL,
+    '__main__.DATA': getattr(__main__, "DATA", "nothing"),
+    'argv': sys.argv,
+    'path': cleaned_sys_path,
+}
+
+print(json.dumps(globals_to_check, indent=4, sort_keys=True))