srcdeps

# A binary dependency pulled from rubygems.org
gem 'rack', '2.0.1'

# A source dependency built by Blunder
# from a git commit
gem 'rack',
    :git => 'https://github.com/rack/rack.git',
    :ref => '0bd839d'

// A binary dependency
libraryDependencies +=
    "com.typesafe.play" %% "play-slick" % "2.0.2"

// A source dependency
myProject
  .dependsOn(
    ProjectRef(
      uri("git://github.com/freekh/play-slick.git#v1.2.3")
      "play-slick"
    )
  )

public class Demo {
  public String sayHello() {
    return "Hello World!";
  }
}

public class DemoTest {
  @Test
  public void sayHelloTest() {
    Assert.assertEquals("Hello World!", new Demo().sayHello());
  }
}

public class Demo {
  public String sayHello() {
    return "Hello World!";
  }
}

public class DemoTest {
  @Test
  public void sayHelloTest() {
    Assert.assertJavaViennaHello(new Demo().sayHello());
    //      ⬑ not available in the stock jUnit :(
  }
}

public class Assert {

  // Add the new method to org.junit.Assert
  public static void assertJavaViennaHello(String actual) {
    assertEquals(
      "Not the right conference!!!",
      "Hello Java Vienna!", actual
    );
  }
...

mvn org.srcdeps.mvn:srcdeps-maven-plugin:3.0.1:init

<extensions>
  <extension>
    <groupId>org.l2x6.srcdeps</groupId>
    <artifactId>srcdeps-maven-local-repository</artifactId>
    <version>3.0.1</version>
  </extension>
</extensions>

configModelVersion: 2.0
repositories:
  junit:
    selectors:
    - junit # a groupId[:artifactId[:version]] pattern
            # may contain * wildcards
    urls:
    - git:https://github.com/ppalaga/junit4.git

...
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
  <version>4.13-SRC-revision-fd0a1c029b99277c955417b0c</version>
</dependency>
...

cd srcdeps-demo
mvn clean test
...
Failed tests:
  sayHelloTest(org.srcdeps.DemoTest): Not the right conference!
    expected:<Hello [Java Vienna]!> but was:<Hello [World]!>
...

cd srcdeps-demo
mvn clean test
...
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
...
BUILD SUCCESS