Add JacksonMongoSessionConverter

Fixes gh-416

spring-session/src/test/java/org/springframework/session/data/mongo/JacksonMongoSessionConverterTest.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2014-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.session.data.mongo;
+
+import com.mongodb.DBObject;
+import org.junit.Test;
+
+import org.springframework.data.mongodb.core.query.Query;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Jakub Kubrynski
+ */
+public class JacksonMongoSessionConverterTest {
+
+	JacksonMongoSessionConverter sut = new JacksonMongoSessionConverter();
+
+	@Test
+	public void shouldSaveIdField() throws Exception {
+		//given
+		MongoExpiringSession session = new MongoExpiringSession();
+
+		//when
+		DBObject convert = this.sut.convert(session);
+
+		//then
+		assertThat(convert.get("_id")).isEqualTo(session.getId());
+		assertThat(convert.get("id")).isNull();
+	}
+
+	@Test
+	public void shouldQueryAgainstAttribute() throws Exception {
+		//when
+		Query cart = this.sut.getQueryForIndex("cart", "my-cart");
+
+		//then
+		assertThat(cart.getQueryObject().get("attrs.cart")).isEqualTo("my-cart");
+	}
+}