[BAEL-19675] - Move articles out of jackson part 2

jackson-conversions/src/test/java/com/baeldung/jackson/map/JacksonMapSerializeUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.jackson.map;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.ser.std.MapSerializer;
+
+public class JacksonMapSerializeUnitTest {
+
+    @JsonSerialize(keyUsing = MyPairSerializer.class)
+    private Map<MyPair, String> map;
+
+    @JsonSerialize(keyUsing = MapSerializer.class)
+    private Map<MyPair, MyPair> cmap;
+
+    @JsonSerialize(keyUsing = MyPairSerializer.class)
+    private MyPair mapKey;
+
+    @JsonSerialize(keyUsing = MyPairSerializer.class)
+    private MyPair mapValue;
+
+    final ObjectMapper mapper = new ObjectMapper();
+
+    @Test
+    public void whenSimpleMapSerialize_thenCorrect() throws JsonProcessingException {
+
+        Map<String, String> map = new HashMap<>();
+        map.put("key", "value");
+
+        final String jsonResult = mapper.writeValueAsString(map);
+
+        Assert.assertEquals("{\"key\":\"value\"}", jsonResult);
+    }
+
+    @Test
+    public void whenCustomObjectStringMapSerialize_thenCorrect() throws JsonProcessingException {
+
+        map = new HashMap<>();
+        MyPair key = new MyPair("Abbott", "Costello");
+        map.put(key, "Comedy");
+
+        final String jsonResult = mapper.writeValueAsString(map);
+
+        Assert.assertEquals("{\"Abbott and Costello\":\"Comedy\"}", jsonResult);
+    }
+
+    @Test
+    public void whenCustomObjectObjectMapSerialize_thenCorrect() throws JsonProcessingException {
+
+        cmap = new HashMap<>();
+        mapKey = new MyPair("Abbott", "Costello");
+        mapValue = new MyPair("Comedy", "1940's");
+        cmap.put(mapKey, mapValue);
+
+        final String jsonResult = mapper.writeValueAsString(cmap);
+
+        Assert.assertEquals("{\"Abbott and Costello\":\"Comedy and 1940's\"}", jsonResult);
+    }
+}