Test static content with MockMVC in Spring Boot with Slice

Question

I'm trying to figure out a way to test with MockMVC the serving of content using a WebSlice that only autoconfigs org.springframework.web.servlet.resource.ResourceHttpRequestHandler (and not controllers)

I've tried something like this:

@RunWith(SpringRunner.class)
@WebMvcTest(
    controllers = {}
)
public class StaticAssetsMVCTest {

but {} is the default and it looks for all controllers. Is there a way to exclude all controllers but keep the other basic spring-web things my app has so that i can test just the static assets slices?

Denis Zavedeev · Accepted Answer · 2019-05-17 20:46:26Z

What about testing static content against a full blown server?

Here is a sample application to show what I'm talking about.

The entry point for such tests is a @LeanWebTest annotation:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = {
    MvcConfig.class,
    WebSecurityConfig.class
})
@EnableAutoConfiguration(exclude = {
    DataSourceAutoConfiguration.class,
    JpaRepositoriesAutoConfiguration.class
})
@Retention(RetentionPolicy.RUNTIME)
public @interface LeanWebTest {
}

@LeanWebTest is a @SpringBootTest using a fully configured server at random port.

It specifies the following @Configuration classes:

MvcConfig - in the sample project it is empty. But it might impact the way the server serves static content
WebSecurityConfig

Spring Security overrides Cache-Control headers. Probably it is not what we might want especially with static resources.

See also: How to enable HTTP response caching in Spring Boot

@LeanWebTest does not use any @Beans from the application except of specified configuration classes. (No @Controllers created)

I see the following aspects applicable to @LeanWebTests:

robots.txt file
javax.servlet.Filters
static resources compression
static resources caching
etc..

The sample application has some tests:

RobotsTxtTest - testing the robots.txt file using RobotsTxt library
StaticContentTest checks that static content is correctly served. Also tests that Cache-Control headers are set as it was specified by application.properties
TomcatRemoteIpHeaderTest - tests whether tomcat correctly applies configured remote-ip-header property

Please note that the project is a rough demonstration of the concept

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