Test proper deserialization of blacklist filters.

Adding a test for the case described in #1641, as closed in
e20fe76.

graylog2-server/src/test/java/org/graylog2/filters/FilterServiceImplTest.java

@@ -0,0 +1,47 @@
+package org.graylog2.filters;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.lordofthejars.nosqlunit.annotation.UsingDataSet;
+import com.lordofthejars.nosqlunit.core.LoadStrategyEnum;
+import com.lordofthejars.nosqlunit.mongodb.InMemoryMongoDb;
+import org.graylog2.bindings.providers.MongoJackObjectMapperProvider;
+import org.graylog2.bindings.providers.ServerObjectMapperProvider;
+import org.graylog2.database.MongoConnectionRule;
+import org.graylog2.filters.blacklist.BlacklistPatternCondition;
+import org.graylog2.filters.blacklist.FilterDescription;
+import org.junit.Before;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.util.Set;
+
+import static com.lordofthejars.nosqlunit.mongodb.InMemoryMongoDb.InMemoryMongoRuleBuilder.newInMemoryMongoDbRule;
+import static org.assertj.core.api.Assertions.*;
+
+public class FilterServiceImplTest {
+    @ClassRule
+    public static final InMemoryMongoDb IN_MEMORY_MONGO_DB = newInMemoryMongoDbRule().build();
+
+    @Rule
+    public MongoConnectionRule mongoRule = MongoConnectionRule.build("test");
+
+    private FilterService filterService;
+
+    @Before
+    public void setUp() throws Exception {
+        final ObjectMapper objectMapper = new ServerObjectMapperProvider().get();
+        this.filterService = new FilterServiceImpl(mongoRule.getMongoConnection(), new MongoJackObjectMapperProvider(objectMapper));
+    }
+
+    @Test
+    @UsingDataSet(locations = "properDeserializationOfSubclasses.json", loadStrategy = LoadStrategyEnum.CLEAN_INSERT)
+    public void testProperDeserializationOfSubclasses() throws Exception {
+        final Set<FilterDescription> filterDescriptionSet = filterService.loadAll();
+        assertThat(filterDescriptionSet).isNotNull().hasSize(1);
+
+        final FilterDescription filterDescription = filterDescriptionSet.iterator().next();
+        assertThat(filterDescription).isNotNull();
+        assertThat(filterDescription instanceof BlacklistPatternCondition);
+    }
+}

graylog2-server/src/test/resources/org/graylog2/filters/properDeserializationOfSubclasses.json

@@ -0,0 +1,14 @@
+{
+  "filters": [
+    {
+      "_id": {"$oid": "54e9deadbeefdeadbeefaffe"},
+      "type" : "regex",
+      "creator_user_id" : "admin",
+      "created_at" : "2015-12-18T12:54:03.911Z",
+      "name" : "Testfilter",
+      "description" : "A basic Regex filter for testing",
+      "field_name" : "message",
+      "pattern" : "posts"
+    }
+  ]
+}