Add a passing test for #2893

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/databind/ser/filter/TestIgnoredTypes.java

@@ -4,6 +4,7 @@
 import java.util.List;
 
 import com.fasterxml.jackson.annotation.*;
+
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 
@@ -58,32 +59,47 @@ static class Wrapped {
         public Wrapped(int x0) { x = x0; }
     }
 
+    // [databind#2893]
+    @JsonIgnoreType
+    interface IgnoreMe { }
+
+    static class ChildOfIgnorable implements IgnoreMe {
+        public int value = 42;
+    }
+
+    static class ContainsIgnorable {
+        public ChildOfIgnorable ign = new ChildOfIgnorable();
+
+        public int x = 13;
+    }
+    
     /*
     /**********************************************************
     /* Unit tests
     /**********************************************************
      */
-    
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
     public void testIgnoredType() throws Exception
     {
-        final ObjectMapper mapper = objectMapper();
-
         // First: should be ok in general, even though couldn't build deserializer (due to non-static inner class):
-        NonIgnoredType bean = mapper.readValue("{\"value\":13}", NonIgnoredType.class);
+        NonIgnoredType bean = MAPPER.readValue("{\"value\":13}", NonIgnoredType.class);
         assertNotNull(bean);
         assertEquals(13, bean.value);
 
         // And also ok to see something with that value; will just get ignored
-        bean = mapper.readValue("{ \"ignored\":[1,2,{}], \"value\":9 }", NonIgnoredType.class);
+        bean = MAPPER.readValue("{ \"ignored\":[1,2,{}], \"value\":9 }", NonIgnoredType.class);
         assertNotNull(bean);
         assertEquals(9, bean.value);
     }
 
     public void testSingleWithMixins() throws Exception {
         SimpleModule module = new SimpleModule();
         module.setMixInAnnotation(Person.class, PersonMixin.class);
-        ObjectMapper mapper = new ObjectMapper();
-        mapper.registerModule(module);
+        ObjectMapper mapper = jsonMapperBuilder()
+                .addModule(module)
+                .build();
         PersonWrapper input = new PersonWrapper();
         String json = mapper.writeValueAsString(input);
         assertEquals("{\"value\":1}", json);
@@ -92,8 +108,9 @@ public void testSingleWithMixins() throws Exception {
     public void testListWithMixins() throws Exception {
         SimpleModule module = new SimpleModule();
         module.setMixInAnnotation(Person.class, PersonMixin.class);
-        ObjectMapper mapper = new ObjectMapper();
-        mapper.registerModule(module);
+        ObjectMapper mapper = jsonMapperBuilder()
+                .addModule(module)
+                .build();
         List<Person> persons = new ArrayList<Person>();
         persons.add(new Person("Bob"));
         String json = mapper.writeValueAsString(persons);
@@ -102,7 +119,7 @@ public void testListWithMixins() throws Exception {
 
     public void testIgnoreUsingConfigOverride() throws Exception
     {
-        final ObjectMapper mapper = objectMapper();
+        final ObjectMapper mapper = newJsonMapper();
         mapper.configOverride(Wrapped.class).setIsIgnoredType(true);
 
         // serialize , first
@@ -114,4 +131,10 @@ public void testIgnoreUsingConfigOverride() throws Exception
                 Wrapper.class);
         assertEquals(5, result.value);
     }
+
+    // [databind#2893]
+    public void testIgnoreTypeViaInterface() throws Exception
+    {
+        assertEquals(a2q("{'x':13}"), MAPPER.writeValueAsString(new ContainsIgnorable()));
+    }
 }