test-jar dependency type is not properly handled with Gradle

[williamsuane]

Generating new Gradle projects that contains testImplementation("org.springframework.cloud:spring-cloud-stream:test-binder@test-jar") fails with the following message when building

Could not find org.springframework.cloud:spring-cloud-stream:test-binder.
Required by:
    project :

Possible solution:
 - Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

How to replicate

Generate a new project Spring Boot 2.4, Java 11, Cloud Stream and Kafka Binder

Run ./gradlew build

The solution that worked was to replace testImplementation("org.springframework.cloud:spring-cloud-stream:test-binder@test-jar") by

testImplementation("org.springframework.cloud:spring-cloud-stream") {
        artifact {
            name = "spring-cloud-stream"
            extension = "jar"
            type ="test-jar"
            classifier = "test-binder"
        }
    }

[snicoll]

@williamsuane thanks for the report.

With the help of @wilkinsona, we've been reminded that Maven handles certain dependency type with "magic strings", see the documentation. To make things consistent between the two model we may need to handle these too considering that type is a shared attribute between the two models.

[snicoll]

So that works but, unfortunately, requesting the jar without a type fails as the dependency is not found in the bom. It is declared like this (correctly according to Maven):

			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-stream</artifactId>
				<version>${spring-cloud-stream.version}</version>
				<type>test-jar</type>
				<scope>test</scope>
				<classifier>test-binder</classifier>
			</dependency>

With the following: testImplementation 'org.springframework.cloud:spring-cloud-stream:test-binder we get:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileTestJava'.
> Could not resolve all files for configuration ':testCompileClasspath'.
   > Could not find org.springframework.cloud:spring-cloud-stream:test-binder.
     Required by:
         project :
   > Could not find org.springframework.cloud:spring-cloud-stream:test-binder.
     Required by:
         project :

Ignoring the type won't fix this issue as we need to definition to match what's in the bom.

[wilkinsona]

I'm a bit surprised that doesn't work. We could probably fix it with a change in the dependency management plugin. It would also be interesting to know how it behaves when using Gradle's Platform support.