1 files changed, 78 insertions, 0 deletions
diff --git a/sources/pyside6/tests/QtCore/qiodevice_buffered_read_test.py b/sources/pyside6/tests/QtCore/qiodevice_buffered_read_test.py
new file mode 100644
index 000000000..ea735112a
--- /dev/null
+++ b/sources/pyside6/tests/QtCore/qiodevice_buffered_read_test.py
@@ -0,0 +1,78 @@
+# Copyright (C) 2023 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+'''Test cases for buffered read methods of QIODevice'''
+
+from PySide6.QtCore import QBuffer
+
+import enum
+import unittest
+
+
+class TestQIODeviceBufferedRead(unittest.TestCase):
+    class TestType(enum.Enum):
+        Read = enum.auto()
+        ReadLine = enum.auto()
+        Peek = enum.auto()
+
+    def setUp(self) -> None:
+        self.buffer = QBuffer()
+        self.text = "Tomato juice\nPotato salad\n"
+
+        self.assertTrue(
+            self.buffer.open(QBuffer.OpenModeFlag.ReadWrite), self.buffer.errorString())
+        self.assertGreaterEqual(
+            self.buffer.write(self.text.encode("utf-8")), 0, self.buffer.errorString())
+
+        self.buffer.seek(0)
+
+    def tearDown(self) -> None:
+        self.buffer.close()
+
+    def test_read(self) -> None:
+        response1 = self.buffer.read(1024).data().decode("utf-8")
+        self.assertEqual(response1, self.text)
+
+        self.buffer.seek(0)
+        response2 = bytearray(1024)
+        bytes_read = self.buffer.read(response2, 1024)
+
+        self.assertGreaterEqual(bytes_read, 0, self.buffer.errorString())
+        self.assertEqual(response2[:bytes_read].decode("utf-8"), response1)
+
+    def test_readLine(self) -> None:
+        response1 = self.buffer.readLine(1024).data().decode("utf-8")
+        # Only read until the first line (including the line break)
+        self.assertEqual(response1, self.text.split("\n", 1)[0] + "\n")
+
+        self.buffer.seek(0)
+        response2 = bytearray(1024)
+        bytes_read = self.buffer.readLine(response2, 1024)
+
+        self.assertGreaterEqual(bytes_read, 0, self.buffer.errorString())
+        self.assertEqual(response2[:bytes_read].decode("utf-8"), response1)
+
+    def test_peek(self) -> None:
+        response1 = self.buffer.peek(1024).data().decode("utf-8")
+        self.assertEqual(response1, self.text)
+
+        # Test that peek has no side effects
+        response_again1 = self.buffer.read(1024).data().decode("utf-8")
+        self.assertEqual(response_again1, response1)
+
+        self.buffer.seek(0)
+        response2 = bytearray(1024)
+        bytes_read = self.buffer.peek(response2, 1024)
+
+        self.assertGreaterEqual(bytes_read, 0, self.buffer.errorString())
+        self.assertEqual(response2[:bytes_read].decode("utf-8"), response1)
+
+        # Test that peek has no side effects
+        response_again2 = bytearray(1024)
+        bytes_read_again2 = self.buffer.read(response_again2, 1024)
+        self.assertEqual(bytes_read, bytes_read_again2)
+        self.assertEqual(response_again2, response2)
+
+
+if __name__ == "__main__":
+    unittest.main()