From 1c31a7e6598ff0290012f56c4ee6ce48a31486d9 Mon Sep 17 00:00:00 2001
From: Robert O'Shea <PurityLake@users.noreply.github.com>
Date: Sun, 31 Jul 2022 14:44:02 +0100
Subject: [PATCH] Added file-like methods to DontReadFromInput (#10173)

Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

Fixes #10150
---
 changelog/10150.bugfix.rst |  1 +
 src/_pytest/capture.py     | 27 +++++++++++++++++++++++++++
 testing/test_capture.py    |  9 +++++++++
 3 files changed, 37 insertions(+)
 create mode 100644 changelog/10150.bugfix.rst

diff --git a/changelog/10150.bugfix.rst b/changelog/10150.bugfix.rst
new file mode 100644
index 000000000..24c7ccd35
--- /dev/null
+++ b/changelog/10150.bugfix.rst
@@ -0,0 +1 @@
+:data:`sys.stdin` now contains all expected methods of a file-like object when capture is enabled.
diff --git a/src/_pytest/capture.py b/src/_pytest/capture.py
index d6cf42c3b..bcfd3449f 100644
--- a/src/_pytest/capture.py
+++ b/src/_pytest/capture.py
@@ -203,12 +203,39 @@ class DontReadFromInput:
     def fileno(self) -> int:
         raise UnsupportedOperation("redirected stdin is pseudofile, has no fileno()")
 
+    def flush(self) -> None:
+        raise UnsupportedOperation("redirected stdin is pseudofile, has no flush()")
+
     def isatty(self) -> bool:
         return False
 
     def close(self) -> None:
         pass
 
+    def readable(self) -> bool:
+        return False
+
+    def seek(self, offset: int) -> int:
+        raise UnsupportedOperation("redirected stdin is pseudofile, has no seek(int)")
+
+    def seekable(self) -> bool:
+        return False
+
+    def tell(self) -> int:
+        raise UnsupportedOperation("redirected stdin is pseudofile, has no tell()")
+
+    def truncate(self, size: int) -> None:
+        raise UnsupportedOperation("cannont truncate stdin")
+
+    def write(self, *args) -> None:
+        raise UnsupportedOperation("cannot write to stdin")
+
+    def writelines(self, *args) -> None:
+        raise UnsupportedOperation("Cannot write to stdin")
+
+    def writable(self) -> bool:
+        return False
+
     @property
     def buffer(self):
         return self
diff --git a/testing/test_capture.py b/testing/test_capture.py
index f0c582b66..00cab1933 100644
--- a/testing/test_capture.py
+++ b/testing/test_capture.py
@@ -897,6 +897,15 @@ def test_dontreadfrominput() -> None:
     iter_f = iter(f)
     pytest.raises(OSError, next, iter_f)
     pytest.raises(UnsupportedOperation, f.fileno)
+    pytest.raises(UnsupportedOperation, f.flush)
+    assert not f.readable()
+    pytest.raises(UnsupportedOperation, f.seek, 0)
+    assert not f.seekable()
+    pytest.raises(UnsupportedOperation, f.tell)
+    pytest.raises(UnsupportedOperation, f.truncate, 0)
+    pytest.raises(UnsupportedOperation, f.write, b"")
+    pytest.raises(UnsupportedOperation, f.writelines, [])
+    assert not f.writable()
     f.close()  # just for completeness