Set PYTHONUTF8 in stubtest to try and prevent crashes

Author: Avasam

stubs/networkx/@tests/stubtest_allowlist.txt

@@ -35,9 +35,6 @@ networkx\.(utils\.)?(backends\.)?_dispatchable\.__call__
 networkx.conftest
 networkx(\..+?)?\.tests(\..+?)?
 
-# Stubtest crashes due to special unicode character
-networkx.readwrite.text.*
-
 # "..._DT is not present at runtime" but we don't set it in stubs, I don't understand this one
 networkx(\.algorithms)?(\.tree)?(\.mst)?\.SpanningTreeIterator\.Partition\._DT
 networkx(\.algorithms)?(\.tree)?(\.branchings)?\.ArborescenceIterator\.Partition\._DT

stubs/networkx/networkx/readwrite/text.pyi

@@ -40,11 +40,13 @@ class UtfDirectedGlyphs(UtfBaseGlyphs):
     last: ClassVar[str]
     mid: ClassVar[str]
     backedge: ClassVar[str]
+    vertical_edge: ClassVar[str]
 
 class UtfUndirectedGlyphs(UtfBaseGlyphs):
     last: ClassVar[str]
     mid: ClassVar[str]
     backedge: ClassVar[str]
+    vertical_edge: ClassVar[str]
 
 def generate_network_text(
     graph,

tests/stubtest_third_party.py

@@ -125,7 +125,13 @@ def run_stubtest(
             # It seems that some other environment variables are needed too,
             # because the CI fails if we pass only os.environ["DISPLAY"]. I didn't
             # "bisect" to see which variables are actually needed.
-            stubtest_env = os.environ | {"MYPYPATH": mypypath, "MYPY_FORCE_COLOR": "1"}
+            stubtest_env = os.environ | {
+                "MYPYPATH": mypypath,
+                "MYPY_FORCE_COLOR": "1",
+                # Prevent stubtest crash due to special unicode character
+                # https://github.com/python/mypy/issues/19071
+                "PYTHONUTF8": "1",
+            }
 
             # Perform some black magic in order to run stubtest inside uWSGI
             if dist_name == "uWSGI":