diff --git a/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.http b/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.http
new file mode 100644
index 00000000..27bdf6b8
--- /dev/null
+++ b/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.http
@@ -0,0 +1,8 @@
+POST /upload HTTP/1.1\r\n
+Host: example.com\r\n
+Transfer-Encoding: chunked\r\n
+\r\n
+-5\r\n
+hello\r\n
+0\r\n
+\r\n
diff --git a/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.py b/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.py
new file mode 100644
index 00000000..4a8c5430
--- /dev/null
+++ b/tests/requests/invalid/rfc9112_chunked_size_minus_sign_01.py
@@ -0,0 +1,7 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+# RFC 9112 section 7.1: chunk-size = 1*HEXDIG; negative sign is invalid.
+from gunicorn.http.errors import InvalidChunkSize
+request = InvalidChunkSize
diff --git a/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.http b/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.http
new file mode 100644
index 00000000..68ca7443
--- /dev/null
+++ b/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.http
@@ -0,0 +1,8 @@
+POST /upload HTTP/1.1\r\n
+Host: example.com\r\n
+Transfer-Encoding: chunked\r\n
+\r\n
++5\r\n
+hello\r\n
+0\r\n
+\r\n
diff --git a/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.py b/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.py
new file mode 100644
index 00000000..342f53e2
--- /dev/null
+++ b/tests/requests/invalid/rfc9112_chunked_size_plus_sign_01.py
@@ -0,0 +1,8 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+# RFC 9112 section 7.1: chunk-size = 1*HEXDIG; a leading sign ("+" or "-")
+# is not valid and has been used in request-smuggling vectors.
+from gunicorn.http.errors import InvalidChunkSize
+request = InvalidChunkSize
diff --git a/tests/requests/valid/rfc9112_chunked_ext_quoted_01.http b/tests/requests/valid/rfc9112_chunked_ext_quoted_01.http
new file mode 100644
index 00000000..51f179a2
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_ext_quoted_01.http
@@ -0,0 +1,8 @@
+POST /upload HTTP/1.1\r\n
+Host: example.com\r\n
+Transfer-Encoding: chunked\r\n
+\r\n
+5;foo="bar baz"\r\n
+hello\r\n
+0\r\n
+\r\n
diff --git a/tests/requests/valid/rfc9112_chunked_ext_quoted_01.py b/tests/requests/valid/rfc9112_chunked_ext_quoted_01.py
new file mode 100644
index 00000000..00c00934
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_ext_quoted_01.py
@@ -0,0 +1,15 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+# RFC 9112 section 7.1.1: chunk-ext-val can be token or quoted-string.
+request = {
+    "method": "POST",
+    "uri": uri("/upload"),
+    "version": (1, 1),
+    "headers": [
+        ("HOST", "example.com"),
+        ("TRANSFER-ENCODING", "chunked"),
+    ],
+    "body": b"hello",
+}
diff --git a/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.http b/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.http
new file mode 100644
index 00000000..708d4d82
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.http
@@ -0,0 +1,8 @@
+POST /upload HTTP/1.1\r\n
+Host: example.com\r\n
+Transfer-Encoding: chunked\r\n
+\r\n
+0005\r\n
+hello\r\n
+0\r\n
+\r\n
diff --git a/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.py b/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.py
new file mode 100644
index 00000000..d0c4142d
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_size_leading_zeros_01.py
@@ -0,0 +1,16 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+# RFC 9112 section 7.1: chunk-size is 1*HEXDIG. Leading zeros are permitted
+# but have been used in smuggling vectors; fixture pins accepted behavior.
+request = {
+    "method": "POST",
+    "uri": uri("/upload"),
+    "version": (1, 1),
+    "headers": [
+        ("HOST", "example.com"),
+        ("TRANSFER-ENCODING", "chunked"),
+    ],
+    "body": b"hello",
+}
diff --git a/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.http b/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.http
new file mode 100644
index 00000000..4c290e82
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.http
@@ -0,0 +1,8 @@
+POST /upload HTTP/1.1\r\n
+Host: example.com\r\n
+Transfer-Encoding: chunked\r\n
+\r\n
+A\r\n
+0123456789\r\n
+0\r\n
+\r\n
diff --git a/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.py b/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.py
new file mode 100644
index 00000000..cb82f874
--- /dev/null
+++ b/tests/requests/valid/rfc9112_chunked_size_uppercase_hex_01.py
@@ -0,0 +1,15 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+# RFC 9112 section 7.1: chunk-size = 1*HEXDIG, which allows both cases.
+request = {
+    "method": "POST",
+    "uri": uri("/upload"),
+    "version": (1, 1),
+    "headers": [
+        ("HOST", "example.com"),
+        ("TRANSFER-ENCODING", "chunked"),
+    ],
+    "body": b"0123456789",
+}