pdb: fix capturing with recursive debugging

Author: blueyed

src/_pytest/debugging.py

@@ -75,6 +75,7 @@ class pytestPDB(object):
     _config = None
     _pdb_cls = pdb.Pdb
     _saved = []
+    _recursive = 0
 
     @classmethod
     def set_trace(cls, set_break=True):
@@ -88,25 +89,33 @@ def set_trace(cls, set_break=True):
                 capman.suspend_global_capture(in_=True)
             tw = _pytest.config.create_terminal_writer(cls._config)
             tw.line()
-            if capman and capman.is_globally_capturing():
-                tw.sep(">", "PDB set_trace (IO-capturing turned off)")
-            else:
-                tw.sep(">", "PDB set_trace")
+            if cls._recursive == 0:
+                if capman and capman.is_globally_capturing():
+                    tw.sep(">", "PDB set_trace (IO-capturing turned off)")
+                else:
+                    tw.sep(">", "PDB set_trace")
 
             class _PdbWrapper(cls._pdb_cls, object):
                 _pytest_capman = capman
                 _continued = False
 
+                def do_debug(self, arg):
+                    cls._recursive += 1
+                    ret = super(_PdbWrapper, self).do_debug(arg)
+                    cls._recursive -= 1
+                    return ret
+
                 def do_continue(self, arg):
                     ret = super(_PdbWrapper, self).do_continue(arg)
                     if self._pytest_capman:
                         tw = _pytest.config.create_terminal_writer(cls._config)
                         tw.line()
-                        if self._pytest_capman.is_globally_capturing():
-                            tw.sep(">", "PDB continue (IO-capturing resumed)")
-                        else:
-                            tw.sep(">", "PDB continue")
-                        self._pytest_capman.resume_global_capture()
+                        if cls._recursive == 0:
+                            if self._pytest_capman.is_globally_capturing():
+                                tw.sep(">", "PDB continue (IO-capturing resumed)")
+                            else:
+                                tw.sep(">", "PDB continue")
+                            self._pytest_capman.resume_global_capture()
                     cls._pluginmanager.hook.pytest_leave_pdb(
                         config=cls._config, pdb=self
                     )

testing/test_pdb.py

@@ -518,6 +518,43 @@ def test_1():
         assert "1 failed" in rest
         self.flush(child)
 
+    def test_pdb_interaction_continue_recursive(self, testdir):
+        p1 = testdir.makepyfile(
+            """
+            import pytest
+
+            def foo():
+                print("print_from_foo")
+
+            def test_1():
+                i = 0
+                print("hello17")
+                pytest.set_trace()
+                x = 3
+                print("hello18")
+                assert 0
+        """
+        )
+        child = testdir.spawn_pytest(str(p1))
+        child.expect(r"PDB set_trace \(IO-capturing turned off\)")
+        child.expect("test_1")
+        child.expect("x = 3")
+        child.expect("Pdb")
+        child.sendline("debug foo()")
+        child.expect("ENTERING RECURSIVE DEBUGGER")
+        child.expect(r"\(\(Pdb")
+        child.sendline("c")
+        child.expect("LEAVING RECURSIVE DEBUGGER")
+        assert b"PDB continue" not in child.before
+        assert b"print_from_foo" in child.before
+        child.sendline("c")
+        child.expect(r"PDB continue \(IO-capturing resumed\)")
+        rest = child.read().decode("utf8")
+        assert "hello17" in rest  # out is captured
+        assert "hello18" in rest  # out is captured
+        assert "1 failed" in rest
+        self.flush(child)
+
     def test_pdb_without_capture(self, testdir):
         p1 = testdir.makepyfile(
             """