For example, we want to test against a implemataion:
package com.example.in28minutes.basic; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component; @Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class BinarySearchImpl { @Autowired
@Qualifier("bubble")
private SortAlgo sortAlgo; public int binarySearch(int [] numbers, int target) {
// Sorting an array sortAlgo.sort(numbers);
System.out.println(sortAlgo);
// Quick sort // Return the result
return 3;
} }
We want to do the test with Java Context:
1. Bring in some dependencies: in pom.xml
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<scope>test</scope>
</dependency> <dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency> <!-- <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency> -->
Create a new test file:
package com.example.in28minutes.basic; import com.example.in28minutes.In28minutesBasicApplication;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner; import static org.junit.Assert.assertEquals; // Load the context
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = In28minutesBasicApplication.class)
public class BinarySearchTest { // Get this bean from context
@Autowired
BinarySearchImpl binarySearchImpl; @Test
public void testBasicScenario () {
// call method on binarySearch
int result = binarySearchImpl.binarySearch(new int[] {}, 5); // check if the value is correct
assertEquals(3, result);
}
}
Two things we need to know:
1. Where can Java find 'BinarySearchImpl', which context it is:
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = In28minutesBasicApplication.class)
Basiclly we need to find out, where we register it:
@SpringBootApplication
public class In28minutesBasicApplication { // What are the beans? --@Component
// What are the dependencies of a bean? -- @AutoWired
// Where to search for beans => NO NEED public static void main(String[] args) {
// Application Context
ApplicationContext applicationContext =
SpringApplication.run(In28minutesBasicApplication.class, args);
BinarySearchImpl binarySearch = applicationContext.getBean(BinarySearchImpl.class);
.... }
}
2. Once we load the context and run with spring runner, we can use '@Autowired' to bring in the bean from the context:
// Get this bean from context
@Autowired
BinarySearchImpl binarySearchImpl;