test: fix the trailing-space test, and suppress warnings about \<space>

Author: nedbat

tests/test_parser.py

@@ -5,6 +5,7 @@
 
 import os.path
 import textwrap
+import warnings
 
 import pytest
 
@@ -492,8 +493,10 @@ def test_ast_dump():
         with open(fname) as f:
             source = f.read()
             num_lines = len(source.splitlines())
-            print(f"file {fname} has {num_lines} lines")
-            ast_root = ast_parse(source)
+            with warnings.catch_warnings():
+                # stress_phystoken.tok has deprecation warnings, suppress them.
+                warnings.filterwarnings("ignore", message=r".*invalid escape sequence",)
+                ast_root = ast_parse(source)
         result = []
         ast_dump(ast_root, print=result.append)
         if num_lines < 100:

tests/test_phystokens.py

@@ -6,6 +6,7 @@
 import os.path
 import re
 import textwrap
+import warnings
 
 import pytest
 
@@ -95,18 +96,20 @@ def test_tokenize_real_file(self):
         real_file = os.path.join(TESTS_DIR, "test_coverage.py")
         self.check_file_tokenization(real_file)
 
-    def test_stress(self):
-        # Check the tokenization of a stress-test file.
+    @pytest.mark.parametrize("fname", [
+        "stress_phystoken.tok",
+        "stress_phystoken_dos.tok",
+    ])
+    def test_stress(self, fname):
+        # Check the tokenization of the stress-test files.
         # And check that those files haven't been incorrectly "fixed".
-        stress = os.path.join(TESTS_DIR, "stress_phystoken.tok")
-        self.check_file_tokenization(stress)
-        with open(stress) as fstress:
-            assert re.search(r"\s$", fstress.read()), f"{stress} needs a trailing space."
-        stress = os.path.join(TESTS_DIR, "stress_phystoken_dos.tok")
-        self.check_file_tokenization(stress)
-        with open(stress) as fstress:
-            assert re.search(r"\s$", fstress.read()), f"{stress} needs a trailing space."
+        with warnings.catch_warnings():
+            warnings.filterwarnings("ignore", message=r".*invalid escape sequence",)
 
+            stress = os.path.join(TESTS_DIR, fname)
+            self.check_file_tokenization(stress)
+            with open(stress) as fstress:
+                assert re.search(r"(?m) $", fstress.read()), f"{stress} needs a trailing space."
 
 @pytest.mark.skipif(not env.PYBEHAVIOR.soft_keywords, reason="Soft keywords are new in Python 3.10")
 class SoftKeywordTest(CoverageTest):