1 files changed, 26 insertions, 0 deletions
diff --git a/tests/extmod/json_dump.py b/tests/extmod/json_dump.py
new file mode 100644
index 000000000..897d33cc8
--- /dev/null
+++ b/tests/extmod/json_dump.py
@@ -0,0 +1,26 @@
+try:
+    from io import StringIO
+    import json
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+s = StringIO()
+json.dump(False, s)
+print(s.getvalue())
+
+s = StringIO()
+json.dump({"a": (2, [3, None])}, s)
+print(s.getvalue())
+
+# dump to a small-int not allowed
+try:
+    json.dump(123, 1)
+except (AttributeError, OSError):  # CPython and uPy have different errors
+    print("Exception")
+
+# dump to an object not allowed
+try:
+    json.dump(123, {})
+except (AttributeError, OSError):  # CPython and uPy have different errors
+    print("Exception")