wip: fix capfd

src/_pytest/capture.py

@@ -347,6 +347,17 @@ class SysCapture(SysCaptureBinary):
         self._old.flush()
 
 
+def flush(func):
+    def flush_inner(*args, **kwargs):
+        sys.stdout.flush()
+        sys.stderr.flush()
+        ret = func(*args, **kwargs)
+        sys.stdout.flush()
+        sys.stderr.flush()
+        return ret
+    return flush_inner
+
+
 class FDCaptureBinary:
     """Capture IO to/from a given OS-level file descriptor.
 
@@ -380,7 +391,7 @@ class FDCaptureBinary:
 
         if targetfd == 0:
             self.tmpfile = open(os.devnull)
-            self.syscapture = SysCapture(targetfd)
+            #self.syscapture = SysCapture(targetfd)
         else:
             self.tmpfile = EncodedFile(
                 TemporaryFile(buffering=0),
@@ -389,10 +400,10 @@ class FDCaptureBinary:
                 newline="",
                 write_through=True,
             )
-            if targetfd in patchsysdict:
-                self.syscapture = SysCapture(targetfd, self.tmpfile)
-            else:
-                self.syscapture = NoCapture()
+            #if targetfd in patchsysdict:
+                #self.syscapture = SysCapture(targetfd, self.tmpfile)
+            #else:
+                #self.syscapture = NoCapture()
 
         self._state = "initialized"
 
@@ -412,13 +423,17 @@ class FDCaptureBinary:
             op, self._state, ", ".join(states)
         )
 
+    @flush
     def start(self) -> None:
         """Start capturing on targetfd using memorized tmpfile."""
         self._assert_state("start", ("initialized",))
+        sys.stdout.flush()
+        sys.stderr.flush()
         os.dup2(self.tmpfile.fileno(), self.targetfd)
-        self.syscapture.start()
+        #self.syscapture.start()
         self._state = "started"
 
+    @flush
     def snap(self):
         self._assert_state("snap", ("started", "suspended"))
         self.tmpfile.seek(0)
@@ -427,35 +442,42 @@ class FDCaptureBinary:
         self.tmpfile.truncate()
         return res
 
+    @flush
     def done(self) -> None:
         """Stop capturing, restore streams, return original capture file,
         seeked to position zero."""
         self._assert_state("done", ("initialized", "started", "suspended", "done"))
         if self._state == "done":
             return
+        sys.stdout.flush()
+        sys.stderr.flush()
         os.dup2(self.targetfd_save, self.targetfd)
         os.close(self.targetfd_save)
         if self.targetfd_invalid is not None:
             if self.targetfd_invalid != self.targetfd:
                 os.close(self.targetfd)
             os.close(self.targetfd_invalid)
-        self.syscapture.done()
+        #self.syscapture.done()
         self.tmpfile.close()
         self._state = "done"
 
+    @flush
     def suspend(self) -> None:
         self._assert_state("suspend", ("started", "suspended"))
         if self._state == "suspended":
             return
-        self.syscapture.suspend()
+        #self.syscapture.suspend()
+        sys.stdout.flush()
+        sys.stderr.flush()
         os.dup2(self.targetfd_save, self.targetfd)
         self._state = "suspended"
 
+    @flush
     def resume(self) -> None:
         self._assert_state("resume", ("started", "suspended"))
         if self._state == "started":
             return
-        self.syscapture.resume()
+        #self.syscapture.resume()
         os.dup2(self.tmpfile.fileno(), self.targetfd)
         self._state = "started"
 
@@ -475,6 +497,8 @@ class FDCapture(FDCaptureBinary):
     EMPTY_BUFFER = ""  # type: ignore
 
     def snap(self):
+        sys.stdout.flush()
+        sys.stderr.flush()
         self._assert_state("snap", ("started", "suspended"))
         self.tmpfile.seek(0)
         res = self.tmpfile.read()

testing/test_capture.py

@@ -275,7 +275,7 @@ class TestPerTestCapturing:
                 raise ValueError
             """
         )
-        result = pytester.runpytest(p1)
+        result = pytester.runpytest_subprocess(p1)
         result.stdout.fnmatch_lines(
             [
                 "*test_capturing_outerr.py .F*",
@@ -510,7 +510,7 @@ class TestCaptureFixture:
                 method
             )
         )
-        result = pytester.runpytest(p)
+        result = pytester.runpytest_subprocess(p)
         result.stdout.fnmatch_lines(["xxx42xxx"])
 
     def test_stdfd_functional(self, pytester: Pytester) -> None:
@@ -571,7 +571,7 @@ class TestCaptureFixture:
                 print("stderr after", file=sys.stderr)
             """
         )
-        result = pytester.runpytest(str(p1), "-rA")
+        result = pytester.runpytest_subprocess(str(p1), "-rA")
         result.stdout.fnmatch_lines(
             [
                 "*- Captured stdout call -*",
@@ -738,8 +738,8 @@ class TestCaptureFixture:
                 cap=cap
             )
         )
-        reprec = pytester.inline_run()
-        reprec.assertoutcome(passed=1)
+        result = pytester.runpytest_subprocess()
+        result.stdout.fnmatch_lines(["*1 passed*"])
 
 
 def test_setup_failure_does_not_kill_capturing(pytester: Pytester) -> None:
@@ -765,7 +765,7 @@ def test_capture_conftest_runtest_setup(pytester: Pytester) -> None:
     """
     )
     pytester.makepyfile("def test_func(): pass")
-    result = pytester.runpytest()
+    result = pytester.runpytest_subprocess()
     assert result.ret == 0
     result.stdout.no_fnmatch_line("*hello19*")
 
@@ -1039,12 +1039,6 @@ class TestFDCapture:
                     cap.targetfd_save, cap.tmpfile
                 )
             )
-            # Should not crash with missing "_old".
-            assert repr(cap.syscapture) == (
-                "<SysCapture stdout _old=<UNSET> _state='done' tmpfile={!r}>".format(
-                    cap.syscapture.tmpfile
-                )
-            )
 
     def test_capfd_sys_stdout_mode(self, capfd) -> None:
         assert "b" not in sys.stdout.mode
@@ -1422,8 +1416,8 @@ def test_error_attribute_issue555(pytester: Pytester) -> None:
         """
         import sys
         def test_capattr():
-            assert sys.stdout.errors == "replace"
-            assert sys.stderr.errors == "replace"
+            assert sys.stdout.errors == "strict"
+            assert sys.stderr.errors == "strict"
     """
     )
     reprec = pytester.inline_run()