test: xfail some tests that need PyPy to improve #1426

https://foss.heptapod.net/pypy/pypy/-/issues/3792

Author: nedbat

coverage/env.py

@@ -85,7 +85,7 @@ class PYBEHAVIOR:
     nix_while_true = (PYVERSION >= (3, 8))
 
     # CPython 3.9a1 made sys.argv[0] and other reported files absolute paths.
-    report_absolute_files = (CPYTHON and PYVERSION >= (3, 9))
+    report_absolute_files = ((CPYTHON or (PYPYVERSION >= (7, 3, 10))) and PYVERSION >= (3, 9))
 
     # Lines after break/continue/return/raise are no longer compiled into the
     # bytecode.  They used to be marked as missing, now they aren't executable.

tests/helpers.py

@@ -320,5 +320,10 @@ def swallow_warnings(message=r".", category=CoverageWarning):
 
 xfail_pypy_3749 = pytest.mark.xfail(
     env.PYVERSION[:2] == (3, 8) and env.PYPY and env.PYPYVERSION >= (7, 3, 10),
-    reason="Avoid a PyPy bug: https://foss.heptapod.net/pypy/pypy/-/issues/3749"
+    reason="Avoid a PyPy bug: https://foss.heptapod.net/pypy/pypy/-/issues/3749",
+)
+
+xfail_pypy_3792 = pytest.mark.xfail(
+    env.PYBEHAVIOR.report_absolute_files and env.PYPY,
+    reason="Avoid a PyPy bug: https://foss.heptapod.net/pypy/pypy/-/issues/3792",
 )

tests/test_process.py

@@ -19,7 +19,7 @@
 from coverage.files import abs_file, python_reported_file
 
 from tests.coveragetest import CoverageTest, TESTS_DIR
-from tests.helpers import re_lines_text
+from tests.helpers import re_lines_text, xfail_pypy_3792
 
 
 class ProcessTest(CoverageTest):
@@ -283,6 +283,7 @@ def test_running_missing_file(self):
         assert "rror" not in out
         assert status == 1
 
+    @xfail_pypy_3792    # Because the file names aren't yet absolute.
     def test_code_throws(self):
         self.make_file("throw.py", """\
             class MyException(Exception):
@@ -302,7 +303,7 @@ def f2():
         status, out = self.run_command_status("coverage run throw.py")
         out2 = self.run_command("python throw.py")
         if env.PYPY:
-            # Pypy has an extra frame in the traceback for some reason
+            # PyPy has an extra frame in the traceback for some reason
             out2 = re_lines_text("toplevel", out2, match=False)
         assert out == out2
 
@@ -695,6 +696,7 @@ def test_coverage_run_dashm_is_like_python_dashm(self):
         actual = self.run_command("coverage run -m process_test.try_execfile")
         self.assert_tryexecfile_output(expected, actual)
 
+    @xfail_pypy_3792    # Because the sys.path[0] isn't yet absolute.
     def test_coverage_run_dir_is_like_python_dir(self):
         with open(TRY_EXECFILE) as f:
             self.make_file("with_main/__main__.py", f.read())