[Python-checkins] gh-94814: Improve coverage of _PyCode_CreateLineArray (GH-94852)

[miss-islington]

https://github.com/python/cpython/commit/8f92ebbde7a841f6557b1d416cbcdba030e4b662
commit: 8f92ebbde7a841f6557b1d416cbcdba030e4b662
branch: 3.11
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2022-07-15T10:28:47-07:00
summary:

gh-94814: Improve coverage of _PyCode_CreateLineArray (GH-94852)


The case where there are more than (1 << 15) lines was not covered.

I don't know if increasing test coverage requires a blurb -- let me know if it does.

Automerge-Triggered-By: GH:brandtbucher
(cherry picked from commit 582ae86b3f07d806f145b3eb9009efd9fbf2e041)

Co-authored-by: Michael Droettboom <mdboom at gmail.com>

files:
M Lib/test/test_sys_settrace.py

diff --git a/Lib/test/test_sys_settrace.py b/Lib/test/test_sys_settrace.py
index f03b03e19a252..4f2dd4f9eade3 100644
--- a/Lib/test/test_sys_settrace.py
+++ b/Lib/test/test_sys_settrace.py
@@ -1571,6 +1571,28 @@ def func():
 
         self.run_and_compare(func, EXPECTED_EVENTS)
 
+    def test_very_large_function(self):
+        # There is a separate code path when the number of lines > (1 << 15).
+        d = {}
+        exec("""def f():              # line 0
+            x = 0                     # line 1
+            y = 1                     # line 2
+            %s                        # lines 3 through (1 << 16)
+            x += 1                    #
+            return""" % ('\n' * (1 << 16),), d)
+        f = d['f']
+
+        EXPECTED_EVENTS = [
+            (0, 'call'),
+            (1, 'line'),
+            (2, 'line'),
+            (65540, 'line'),
+            (65541, 'line'),
+            (65541, 'return'),
+        ]
+
+        self.run_and_compare(f, EXPECTED_EVENTS)
+
 
 EVENT_NAMES = [
     'call',