Add test for #52

mrbean/src/test/java/com/fasterxml/jackson/module/mrbean/TestDefaultMethods.java

@@ -0,0 +1,30 @@
+package com.fasterxml.jackson.module.mrbean;
+
+import com.fasterxml.jackson.databind.*;
+
+import java.io.IOException;
+
+// test for [modules-base#52]
+public class TestDefaultMethods
+    extends BaseTest {
+
+    public interface HasId {
+        long id();
+    }
+
+    public interface HasIdImpl extends HasId {
+        @Override
+        default long id() {
+            return 42L;
+        }
+    }
+
+    public void testMaterializedDefaultMethod() throws IOException {
+        final ObjectMapper mapper = newMrBeanMapper();
+
+        // Main thing is that we should not get an exception for missing method,
+        // as it is correctly deduced to have been implemented
+        final HasIdImpl bean = mapper.readValue("{}", HasIdImpl.class);
+        assertEquals(42L, bean.id());
+    }
+}