Add more test coverage to push-to-trunk script.

tools/push-to-trunk/common_includes.py

Index: tools/push-to-trunk/common_includes.py
diff --git a/tools/push-to-trunk/common_includes.py b/tools/push-to-trunk/common_includes.py
index 3b2eab01e1ecb3838be84cf3d563354318194eb2..eb2bfb07b3549838395dbc363b62d52db9383656 100644
--- a/tools/push-to-trunk/common_includes.py
+++ b/tools/push-to-trunk/common_includes.py
@@ -67,6 +67,14 @@ def MSub(rexp, replacement, text):
   return re.sub(rexp, replacement, text, flags=re.MULTILINE)
 
 
+def GetLastChangeLogEntries(change_log_file):
+  result = []
+  for line in LinesInFile(change_log_file):
+    if re.search(r"^\d{4}-\d{2}-\d{2}:", line) and result: break
+    result.append(line)
+  return "".join(result)
+
+
 # Some commands don't like the pipe, e.g. calling vi from within the script or
 # from subscripts like git cl upload.
 def Command(cmd, args="", prefix="", pipe=True):