Testing Spring Data MongoDB Apps with NoSQL Unit
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Testing Spring Data MongoDB Apps with NoSQL Unit
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Spring Data MongoDB
Spring Data MongoDB is the project within
Spring Data project which provides an extension to the
Spring programming model for writing applications that uses
MongoDB as database.
To write tests using
NoSQLUnit for
Spring Data MongoDB applications, you do need nothing special apart from considering that
Spring Data MongoDB uses a special property called
_class for storing type information alongside the document.
_class property stores the fully qualified classname inside the document for the top-level document as well as for every value if it is a complex type.
 |
Type mappingMappingMongoConverter is used as default type mapping implementation but you can customize even more using
@TypeAlias or implementing
TypeInformationMapper interface.
|
Application
Starfleet has asked us to develop an application for storing all logs of starship crew members into their systems.
To implement this requirement we are going to use
MongoDB database as backend system and
Spring Data MongoDB at persistence layer.
Log documents have next
json format:
Example of Log Document
{
"_class" : "com.lordofthejars.nosqlunit.springdata.mongodb.log.Log" ,
"_id" : 1 ,
"owner" : "Captain" ,
"stardate" : {
"century" : 4 ,
"season" : 3 ,
"sequence" : 125 ,
"day" : 8
} ,
"messages" : [
"We have entered a spectacular binary star system in the Kavis Alpha sector on a most critical mission of astrophysical research. Our eminent guest, Dr. Paul Stubbs, will attempt to study the decay of neutronium expelled at relativistic speeds from a massive stellar explosion which will occur here in a matter of hours." ,
"Our computer core has clearly been tampered with and yet there is no sign of a breach of security on board. We have engines back and will attempt to complete our mission. But without a reliable computer, Dr. Stubbs' experiment is in serious jeopardy."
]
}
This document is modelized into two Java classes, one for whole document and another one for stardate part.
Stardate class
@Document
public class Stardate {
private int century;
private int season;
private int sequence;
private int day;
public static final Stardate createStardate(int century, int season, int sequence, int day) {
Stardate stardate = new Stardate();
stardate.setCentury(century);
stardate.setSeason(season);
stardate.setSequence(sequence);
stardate.setDay(day);
return stardate;
}
//Getters and Setters
}
@Document
public class Stardate {
private int century;
private int season;
private int sequence;
private int day;
public static final Stardate createStardate(int century, int season, int sequence, int day) {
Stardate stardate = new Stardate();
stardate.setCentury(century);
stardate.setSeason(season);
stardate.setSequence(sequence);
stardate.setDay(day);
return stardate;
}
//Getters and Setters
} |
@Document
public class Log {
@Id
private int logId;
private String owner;
private Stardate stardate;
private List<String> messages = new ArrayList<String>();
//Getters and Setters
}
Apart from model classes, we also need a DAO class for implementing CRUD operations, and
spring application context file.
MongoLogManager class@Repository
public class MongoLogManager implements LogManager {
private MongoTemplate mongoTemplate;
public void create(Log log) {
this.mongoTemplate.insert(log);
}
public List<Log> findAll() {
return this.mongoTemplate.findAll(Log.class);
}
@Autowired
public void setMongoTemplate(MongoTemplate mongoTemplate) {
this.mongoTemplate = mongoTemplate;
}
}
@Repository
public class MongoLogManager implements LogManager {
private MongoTemplate mongoTemplate;
public void create(Log log) {
this.mongoTemplate.insert(log);
}
public List<Log> findAll() {
return this.mongoTemplate.findAll(Log.class);
}
@Autowired
public void setMongoTemplate(MongoTemplate mongoTemplate) {
this.mongoTemplate = mongoTemplate;
}
} |
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<context:component-scan base-package="com.lordofthejars.nosqlunit.springdata.mongodb"/>
<context:annotation-config/>
</beans>
 |
For this example we have used
MongoTemplate class for accessing to
MongoDB to not create an overcomplicated example, but in a bigger project I recommend use
Spring Data Repository approach by implementing
CrudRepository interface on manager classes.
|
Testing
As has been told previously, you don’t have to do anything special beyond using
all-logs file
LocalhostMongoAppConfig
class property correctly. Let’s see the dataset used to test the
findAll method by seeding _log collection of
logs database.
all-logs file
{
"log":[
{
"_class" : "com.lordofthejars.nosqlunit.springdata.mongodb.log.Log" ,
"_id" : 1 ,
"owner" : "Captain" ,
"stardate" : {
"century" : 4 ,
"season" : 3 ,
"sequence" : 125 ,
"day" : 8
} ,
"messages" : [
"We have entered a spectacular binary star system in the Kavis Alpha sector on a most critical mission of astrophysical research. Our eminent guest, Dr. Paul Stubbs, will attempt to study the decay of neutronium expelled at relativistic speeds from a massive stellar explosion which will occur here in a matter of hours." ,
"Our computer core has clearly been tampered with and yet there is no sign of a breach of security on board. We have engines back and will attempt to complete our mission. But without a reliable computer, Dr. Stubbs' experiment is in serious jeopardy."
]
}
,
{
"_class" : "com.lordofthejars.nosqlunit.springdata.mongodb.log.Log" ,
"_id" : 2 ,
"owner" : "Captain" ,
"stardate" : {
"century" : 4 ,
"season" : 3 ,
"sequence" : 152 ,
"day" : 4
} ,
"messages" : [
"We are cautiously entering the Delta Rana star system three days after receiving a distress call from the Federation colony on its fourth planet. The garbled transmission reported the colony under attack from an unidentified spacecraft. Our mission is one of rescue and, if necessary, confrontation with a hostile force."
]
}
...
}
See that
_class property is set to full qualified name of
Log class.
Next step is configuring
MongoTemplate for test execution.
LocalhostMongoAppConfig
@Configuration
@Profile("test")
public class LocalhostMongoAppConfig {
private static final String DATABASE_NAME = "logs";
public @Bean Mongo mongo() throws UnknownHostException, MongoException {
Mongo mongo = new Mongo("localhost");
return mongo;
}
public @Bean MongoTemplate mongoTemplate() throws UnknownHostException, MongoException {
MongoTemplate mongoTemplate = new MongoTemplate(mongo(), DATABASE_NAME);
return mongoTemplate;
}
}
Notice that this
MongoTemplate object will be instantiated only when
test profile is active.
And now we can write the
JUnit test case:
WhenAlmiralWantsToReadLogs@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:com/lordofthejars/nosqlunit/springdata/mongodb/log/application-context-test.xml")
@ActiveProfiles("test")
@UsingDataSet(locations = "all-logs.json", loadStrategy = LoadStrategyEnum.CLEAN_INSERT)
public class WhenAlmiralWantsToReadLogs {
@ClassRule
public static ManagedMongoDb managedMongoDb = newManagedMongoDbRule()
.mongodPath(
"/Users/alexsotobueno/Applications/mongodb-osx-x86_64-2.0.5")
.build();
@Rule
public MongoDbRule mongoDbRule = newMongoDbRule().defaultManagedMongoDb("logs");
@Autowired
private LogManager logManager;
@Test
public void all_entries_should_be_loaded() {
List<Log> allLogs = logManager.findAll();
assertThat(allLogs, hasSize(3));
}
}
There are some important points in the previous class to take a look:
-
Because NoSQLUnit uses JUnit Rules you can use
@RunWith(SpringJUnit4ClassRunner)freely. -
Using
@ActiveProfileswe are loading the test configuration instead of the production ones. -
You can use Spring annotations like
@Autowiredwithout any problem.
Conclusions
There is not much difference between writing tests for none
Spring Data MongoDB and applications that use it. Only keep in mind to define correctly the
We keep learning,
Alex.
_class property.
We keep learning,
Alex.
Els astronautes volen baix, Els núvols passen com qui no diu res. Amb les butxaques a les mans, Caminarem els passos d’altres peus. (Pa amb Oli i Sal - Blaumut)
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