Add a (failing) test for #224

datetime/src/test/java/com/fasterxml/jackson/datatype/jsr310/failing/DurationSer224Test.java

@@ -0,0 +1,40 @@
+package com.fasterxml.jackson.datatype.jsr310.failing;
+
+import java.time.Duration;
+
+import org.junit.Test;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.*;
+
+import com.fasterxml.jackson.datatype.jsr310.ModuleTestBase;
+
+import static org.junit.Assert.assertEquals;
+
+public class DurationSer224Test extends ModuleTestBase
+{
+    // [datetime#224]
+    static class MyDto224 {
+      @JsonFormat(pattern = "MINUTES"
+              // Work-around from issue:
+//              , without = JsonFormat.Feature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS
+      )
+      @JsonProperty("mins")
+      private final Duration duration;
+
+      public MyDto224(Duration d) { duration = d; }
+
+      public Duration getDuration() { return duration; }
+    }
+
+    private final ObjectMapper MAPPER = newMapper();
+
+    // [datetime#224]
+    @Test
+    public void testDurationFormatOverride() throws Exception
+    {
+        final String json = MAPPER.writeValueAsString(new MyDto224(Duration.ofHours(2)));
+        assertEquals(a2q("{'mins':120}"), json);
+    }
+}