diff --git a/tests/cpydiff/modules_errno_enotsup.py b/tests/cpydiff/modules_errno_enotsup.py
new file mode 100644
index 0000000000000..28c494165e21c
--- /dev/null
+++ b/tests/cpydiff/modules_errno_enotsup.py
@@ -0,0 +1,10 @@
+"""
+categories: Modules,errno
+description: Micropython does not include ``ENOTSUP`` as a name for errno 95.
+cause: Micropython does not implement the ``ENOTSUP`` canonical alias for ``EOPNOTSUPP`` added in CPython 3.2.
+workaround: Use ``errno.EOPNOTSUPP`` in place of ``errno.ENOTSUP``.
+"""
+
+import errno
+
+print(f"{errno.errorcode[errno.EOPNOTSUPP]=!s}")
diff --git a/tests/cpydiff/types_oserror_errnomap.py b/tests/cpydiff/types_oserror_errnomap.py
new file mode 100644
index 0000000000000..b2b7745056043
--- /dev/null
+++ b/tests/cpydiff/types_oserror_errnomap.py
@@ -0,0 +1,48 @@
+"""
+categories: Types,OSError
+description: OSError constructor returns a plain OSError for all errno values, rather than a relevant subtype.
+cause: Micropython does not include the CPython-standard OSError subclasses.
+workaround: Catch OSError and use its errno attribute to discriminate the cause.
+"""
+
+import errno
+
+errno_list = [ # i.e. the set implemented by micropython
+ errno.EPERM,
+ errno.ENOENT,
+ errno.EIO,
+ errno.EBADF,
+ errno.EAGAIN,
+ errno.ENOMEM,
+ errno.EACCES,
+ errno.EEXIST,
+ errno.ENODEV,
+ errno.EISDIR,
+ errno.EINVAL,
+ errno.EOPNOTSUPP,
+ errno.EADDRINUSE,
+ errno.ECONNABORTED,
+ errno.ECONNRESET,
+ errno.ENOBUFS,
+ errno.ENOTCONN,
+ errno.ETIMEDOUT,
+ errno.ECONNREFUSED,
+ errno.EHOSTUNREACH,
+ errno.EALREADY,
+ errno.EINPROGRESS,
+]
+
+
+def errno_output_type(n):
+ try:
+ raise OSError(n, "")
+ except OSError as e:
+ return f"{type(e).__name__}"
+ except Exception as e:
+ return f"non-OSError {type(e).__name__}"
+ else:
+ return "no error"
+
+
+for n in errno_list:
+ print(errno.errorcode[n], "=", errno_output_type(n))
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