Add failing test (reproduction) for #562 (#4347)

src/test/java/com/fasterxml/jackson/failing/AnySetterForCreator562Test.java

@@ -0,0 +1,47 @@
+package com.fasterxml.jackson.failing;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.*;
+
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.testutil.DatabindTestUtil;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class AnySetterForCreator562Test extends DatabindTestUtil
+{
+    // [databind#562]
+    static class POJO562
+    {
+        String a;
+
+        Map<String,Object> stuff;
+
+        @JsonCreator
+        public POJO562(@JsonProperty("a") String a,
+            @JsonAnySetter Map<String, Object>
+        leftovers) {
+            this.a = a;
+            stuff = leftovers;
+        }
+    }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    // [databind#562]
+    @Test
+    public void testAnySetterViaCreator562() throws Exception
+    {
+        POJO562 pojo = MAPPER.readValue(a2q(
+                "{'a':'value', 'b':42}"
+                ),
+                POJO562.class);
+        assertEquals(pojo.a, "value");
+        assertEquals(Collections.singletonMap("b", Integer.valueOf(42)),
+                pojo.stuff);
+    }
+}