Create NullsSkip4309Test.java (#4318)

Author: JooHyukKim

src/test/java/com/fasterxml/jackson/failing/NullsSkip4309Test.java

@@ -0,0 +1,71 @@
+package com.fasterxml.jackson.failing;
+
+import java.util.List;
+
+import com.fasterxml.jackson.annotation.JsonSetter;
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.Nulls;
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+// [databind#4309] : Use @JsonSetter(nulls=...) handling of null values during deserialization with
+public class NullsSkip4309Test
+{
+    static class Data1 {
+        public List<Type> types;
+    }
+
+    static enum Type {
+        ONE, TWO
+    }
+
+    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type", include = JsonTypeInfo.As.EXISTING_PROPERTY, visible = true)
+    @JsonSubTypes(value = { @JsonSubTypes.Type(value = DataType1.class, names = { "TYPE1" }) })
+    static abstract class Data2 {
+        public String type;
+    }
+
+    static class DataType1 extends Data2 { }
+
+    @Test
+    void shouldSkipUnknownEnumDeserializationWithSetter() throws Exception
+    {
+        // Given
+        String json = "{ \"types\" : [\"TWO\", \"THREE\"] }";
+
+        // When
+        Data1 data = JsonMapper.builder()
+            .defaultSetterInfo(JsonSetter.Value.forContentNulls(Nulls.SKIP))
+            .enable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL)
+            .build()
+            .readValue(json, Data1.class); // will be [TWO, null]
+
+        // Then
+        assertEquals(1, data.types.size());
+        assertEquals(Type.TWO, data.types.get(0));
+    }
+
+    @Test
+    void shouldSkipUnknownSubTypeDeserializationWithSetter() throws Exception
+    {
+        // Given
+        String json = "[ {\"type\":\"TYPE1\" }, { \"type\" : \"TYPE2\"  } ]";
+
+        // When
+        List<Data2> actual = JsonMapper.builder()
+            .defaultSetterInfo(JsonSetter.Value.forContentNulls(Nulls.SKIP))
+            .disable(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE)
+            .build()
+            .readValue(json, new TypeReference<List<Data2>>() {});
+
+        // Then
+        assertEquals(1, actual.size());
+        assertEquals(DataType1.class, actual.get(0).getClass());
+    }
+}