typing: EncodedFile

src/_pytest/capture.py

@@ -9,6 +9,7 @@ import os
 import sys
 from io import UnsupportedOperation
 from tempfile import TemporaryFile
+from typing import BinaryIO
 from typing import List
 
 import pytest
@@ -414,29 +415,27 @@ def safe_text_dupfile(f, mode, default_encoding="UTF8"):
 class EncodedFile:
     errors = "strict"  # possibly needed by py3 code (issue555)
 
-    def __init__(self, buffer, encoding):
+    def __init__(self, buffer: BinaryIO, encoding: str) -> None:
         self.buffer = buffer
         self.encoding = encoding
 
-    def write(self, obj):
+    def write(self, obj: str) -> int:
-        if isinstance(obj, str):
+        if not isinstance(obj, str):
-            obj = obj.encode(self.encoding, "replace")
-        else:
             raise TypeError(
                 "write() argument must be str, not {}".format(type(obj).__name__)
             )
-        return self.buffer.write(obj)
+        return self.buffer.write(obj.encode(self.encoding, "replace"))
 
     def writelines(self, linelist: List[str]) -> None:
         self.buffer.writelines([x.encode(self.encoding, "replace") for x in linelist])
 
     @property
-    def name(self):
+    def name(self) -> str:
         """Ensure that file.name is a string."""
         return repr(self.buffer)
 
     @property
-    def mode(self):
+    def mode(self) -> str:
         return self.buffer.mode.replace("b", "")
 
     def __getattr__(self, name):

testing/test_capture.py

@@ -7,6 +7,7 @@ import sys
 import textwrap
 from io import StringIO
 from io import UnsupportedOperation
+from typing import BinaryIO
 from typing import List
 from typing import TextIO
 
@@ -1499,7 +1500,7 @@ def test_stderr_write_returns_len(capsys):
     assert sys.stderr.write("Foo") == 3
 
 
-def test_encodedfile_writelines(tmpfile) -> None:
+def test_encodedfile_writelines(tmpfile: BinaryIO) -> None:
     ef = capture.EncodedFile(tmpfile, "utf-8")
     with pytest.raises(AttributeError):
         ef.writelines([b"line1", b"line2"])  # type: ignore[list-item]  # noqa: F821