Add behavioral test regarding transient field with annotation (#3951)

Author: JooHyukKim

src/test/java/com/fasterxml/jackson/databind/introspect/Transient3948Test.java

@@ -0,0 +1,67 @@
+package com.fasterxml.jackson.databind.introspect;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.MapperFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.io.Serializable;
+
+public class Transient3948Test extends BaseMapTest {
+
+    @JsonPropertyOrder(alphabetic = true)
+    static class Obj implements Serializable {
+
+        private static final long serialVersionUID = -1L;
+
+        private String a = "hello";
+
+        @JsonIgnore
+        private transient String b = "world";
+
+        @JsonProperty("cat")
+        private String c = "jackson";
+
+        @JsonProperty("dog")
+        private transient String d = "databind";
+
+        public String getA() {
+            return a;
+        }
+
+        public String getB() {
+            return b;
+        }
+
+        public String getC() {
+            return c;
+        }
+
+        public String getD() {
+            return d;
+        }
+    }
+
+    final ObjectMapper DEFAULT_MAPPER = newJsonMapper();
+
+    final ObjectMapper MAPPER_TRANSIENT = jsonMapperBuilder()
+            .configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true)
+            .build();
+
+    public void testJsonIgnoreSerialization() throws Exception {
+        Obj obj1 = new Obj();
+
+        String json = DEFAULT_MAPPER.writeValueAsString(obj1);
+
+        assertEquals(a2q("{'a':'hello','b':'world','cat':'jackson','dog':'databind'}"), json);
+    }
+
+    public void testJsonIgnoreSerializationTransient() throws Exception {
+        Obj obj1 = new Obj();
+
+        String json = MAPPER_TRANSIENT.writeValueAsString(obj1);
+
+        assertEquals(a2q("{'a':'hello','cat':'jackson','dog':'databind'}"), json);
+    }
+}