add test

Author: methane

pyproject.toml

@@ -19,6 +19,7 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
+dependencies = []
 
 [project.urls]
 Homepage = "https://msgpack.org/"
@@ -43,3 +44,9 @@ lint.select = [
     "I", # isort
     #"UP", pyupgrade
 ]
+
+[dependency-groups]
+dev = [
+    "cython>=3.2.5",
+    "pytest>=9.0.3",
+]

test/test_extension.py

@@ -6,7 +6,7 @@
 
 def test_pack_ext_type():
     def p(s):
-        packer = msgpack.Packer()
+        packer = msgpack.Packer(autoreset=False)
         packer.pack_ext_type(0x42, s)
         return packer.bytes()
 
@@ -20,6 +20,15 @@ def p(s):
     assert p(b"A" * 0x00012345) == b"\xc9\x00\x01\x23\x45\x42" + b"A" * 0x00012345  # ext 32
 
 
+def test_pack_ext_type_autoreset():
+    packer = msgpack.Packer()
+
+    assert packer.pack_ext_type(0x42, b"A") == b"\xd4\x42A"
+    assert packer.bytes() == b""
+    assert packer.pack_ext_type(0x42, b"ABC") == b"\xc7\x03\x42ABC"
+    assert packer.bytes() == b""
+
+
 def test_unpack_ext_type():
     def check(b, expected):
         assert msgpack.unpackb(b) == expected