Add failing test for [kotlin-module#308] (#5459)

Author: cowtowncoder

src/test/java/tools/jackson/databind/tofix/KotlinIssue308JsonIgnoreTest.java

@@ -0,0 +1,54 @@
+package tools.jackson.databind.tofix;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.testutil.failure.JacksonTestFailureExpected;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static tools.jackson.databind.testutil.DatabindTestUtil.*;
+
+// From https://github.com/FasterXML/jackson-module-kotlin/issues/308
+/**
+ * Test for verifying that {@link JsonIgnore} on a field combined with
+ * {@link JsonProperty} on a private setter method works correctly.
+ * The private method "unpacks" the JSON property value to a different field.
+ */
+public class KotlinIssue308JsonIgnoreTest
+{
+    static class TestDto
+    {
+        @JsonIgnore
+        Integer id;
+
+        Integer cityId;
+
+        @JsonCreator
+        public TestDto(Integer id, Integer cityId) {
+            this.id = id;
+            this.cityId = cityId;
+        }
+
+        @JsonProperty("id")
+        void unpackId(Integer idObj) {
+            cityId = idObj;
+        }
+    }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    @JacksonTestFailureExpected
+    @Test
+    public void testJsonIgnoreWithJsonPropertyUnpacker() throws Exception
+    {
+        TestDto dto = MAPPER.readValue("{\"id\":12345}", TestDto.class);
+
+        assertNotNull(dto);
+        assertEquals(Integer.valueOf(12345), dto.cityId);
+        assertNull(dto.id);
+    }
+}