2 files changed, 48 insertions, 0 deletions
diff --git a/tests/basics/dict_union.py b/tests/basics/dict_union.py
new file mode 100644
index 000000000..606b1c4c5
--- /dev/null
+++ b/tests/basics/dict_union.py
@@ -0,0 +1,36 @@
+# Test dictionary union.
+#
+# The tests sort the resulting dictionaries for now, since map insertion
+# order is not implemented in MicroPython.
+
+try:
+    {} | {}
+except TypeError:
+    print("SKIP")
+    raise SystemExit
+
+
+def print_sorted_dict(d):
+    print(sorted(d.items()))
+
+
+def test_union(a, b):
+    print_sorted_dict(a | b)
+    print_sorted_dict(b | a)
+    a |= a
+    print_sorted_dict(a)
+    a |= b
+    print_sorted_dict(a)
+
+
+d = {}
+e = {}
+test_union(d, e)
+
+d = {1: "apple"}
+e = {1: "cheese"}
+test_union(d, e)
+
+d = {"spam": 1, "eggs": 2, "cheese": 3}
+e = {"cheese": "cheddar", "aardvark": "Ethel"}
+test_union(d, e)
diff --git a/tests/basics/dict_union.py.exp b/tests/basics/dict_union.py.exp
new file mode 100644
index 000000000..7a8f83bd5
--- /dev/null
+++ b/tests/basics/dict_union.py.exp
@@ -0,0 +1,12 @@
+[]
+[]
+[]
+[]
+[(1, 'cheese')]
+[(1, 'apple')]
+[(1, 'apple')]
+[(1, 'cheese')]
+[('aardvark', 'Ethel'), ('cheese', 'cheddar'), ('eggs', 2), ('spam', 1)]
+[('aardvark', 'Ethel'), ('cheese', 3), ('eggs', 2), ('spam', 1)]
+[('cheese', 3), ('eggs', 2), ('spam', 1)]
+[('aardvark', 'Ethel'), ('cheese', 'cheddar'), ('eggs', 2), ('spam', 1)]