Add deserialization test

Author: rhaps0dy

.changelog/_unreleased.toml

@@ -0,0 +1,5 @@
+[[entries]]
+id = "6d0f41f2-f7f9-4808-af65-196a7a909b4f"
+type = "fix"
+description = "Fix #47: Union with Literal in them can now de/serialize"
+author = "@rhaps0dy"

databind/src/databind/json/tests/converters_test.py

@@ -726,3 +726,9 @@ def test_union_literal():
 
     assert mapper.serialize("bye", StrType) == "bye"
     assert mapper.serialize("other", StrType) == "other"
+
+    assert mapper.deserialize("hi", IntType) == "hi"
+    assert mapper.deserialize(2, IntType) == 2
+
+    assert mapper.deserialize("bye", StrType) == "bye"
+    assert mapper.deserialize("other", StrType) == "other"