gistfile1.java

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.mock.env.MockEnvironment;

public class QuickTest {
	@Test
	public void withProperty() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(PropertySourcesPlaceholderConfigurer.class, Foo.class);
		ctx.setEnvironment(new MockEnvironment().withProperty("myprop", "someval"));
		ctx.refresh();
		assertThat(ctx.getBean(Foo.class).myprop, equalTo("someval"));
	}

	@Test
	public void withoutProperty() {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(PropertySourcesPlaceholderConfigurer.class, Foo.class);
		ctx.refresh();
		assertThat(ctx.getBean(Foo.class).myprop, equalTo("defaultval"));
	}
}

class Foo {
	@Value("${myprop:defaultval}")
	String myprop;
}