Add test for whatDependsOn

src/main/scala/net/virtualvoid/sbt/graph/DependencyGraphKeys.scala

@@ -93,7 +93,7 @@ trait DependencyGraphKeys {
 
   // internal
   private[graph] val moduleGraphStore = TaskKey[ModuleGraph]("module-graph-store", "The stored module-graph from the last run")
-  private[graph] val whatDependsOn = InputKey[Unit]("what-depends-on", "Shows information about what depends on the given module")
+  val whatDependsOn = InputKey[String]("what-depends-on", "Shows information about what depends on the given module")
   private[graph] val crossProjectId = SettingKey[ModuleID]("dependency-graph-cross-project-id")
 }
 

src/main/scala/net/virtualvoid/sbt/graph/DependencyGraphSettings.scala

@@ -99,10 +99,15 @@ object DependencyGraphSettings {
           case Some(version) ⇒ ModuleId(org, name, version) :: Nil
           case None          ⇒ graph.nodes.filter(m ⇒ m.id.organisation == org && m.id.name == name).map(_.id)
         }
-      modules
-        .foreach { module ⇒
-          streams.value.log.info(rendering.AsciiTree.asciiTree(GraphTransformations.reverseGraphStartingAt(graph, module)))
-        }
+      val output =
+        modules
+          .map { module ⇒
+            rendering.AsciiTree.asciiTree(GraphTransformations.reverseGraphStartingAt(graph, module))
+          }
+          .mkString("\n")
+
+      streams.value.log.info(output)
+      output
     },
     licenseInfo := showLicenseInfo(moduleGraph.value, streams.value)) ++ AsciiGraph.asciiGraphSetttings)
 
@@ -192,7 +197,6 @@ object DependencyGraphSettings {
               case ((org, name), version) ⇒ ArtifactPattern(org, name, version)
             }
         }
-
         .reduceOption(_ | _).getOrElse(failure("No dependencies found"))
     }
 

src/sbt-test/sbt-dependency-graph/whatDependsOn/build.sbt

@@ -0,0 +1,52 @@
+version := "0.1.0-SNAPSHOT"
+
+scalaVersion := "2.9.1"
+
+resolvers += "typesafe maven" at "https://repo.typesafe.com/typesafe/maven-releases/"
+
+libraryDependencies ++= Seq(
+  "com.codahale" % "jerkson_2.9.1" % "0.5.0",
+  "org.codehaus.jackson" % "jackson-mapper-asl" % "1.9.10" // as another version of asl
+)
+
+val check = TaskKey[Unit]("check")
+
+check := {
+  def sanitize(str: String): String = str.split('\n').map(_.trim).mkString("\n")
+  def checkOutput(output: String, expected: String): Unit =
+    require(sanitize(expected) == sanitize(output), s"Tree should have been [\n${sanitize(expected)}\n] but was [\n${sanitize(output)}\n]")
+
+  val withVersion =
+    (whatDependsOn in Compile)
+      .toTask(" org.codehaus.jackson jackson-core-asl 1.9.11")
+      .value
+  val expectedGraphWithVersion =
+    """org.codehaus.jackson:jackson-core-asl:1.9.11
+      |  +-com.codahale:jerkson_2.9.1:0.5.0 [S]
+      |  | +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      |  |
+      |  +-org.codehaus.jackson:jackson-mapper-asl:1.9.11
+      |    +-com.codahale:jerkson_2.9.1:0.5.0 [S]
+      |    | +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      |    |
+      |    +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      |  """.stripMargin
+
+  checkOutput(withVersion, expectedGraphWithVersion)
+
+  val withoutVersion =
+    (whatDependsOn in Compile)
+      .toTask(" org.codehaus.jackson jackson-mapper-asl")
+      .value
+  val expectedGraphWithoutVersion =
+    """org.codehaus.jackson:jackson-mapper-asl:1.9.11
+      | +-com.codahale:jerkson_2.9.1:0.5.0 [S]
+      | | +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      | |
+      | +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      |
+      |org.codehaus.jackson:jackson-mapper-asl:1.9.10 (evicted by: 1.9.11)
+      | +-default:whatdependson_2.9.1:0.1.0-SNAPSHOT [S]
+      |   """.stripMargin
+  checkOutput(withoutVersion, expectedGraphWithoutVersion)
+}

src/sbt-test/sbt-dependency-graph/whatDependsOn/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % sys.props("project.version"))

src/sbt-test/sbt-dependency-graph/whatDependsOn/test

@@ -0,0 +1,3 @@
+# to initialize parser with deps
+> compile:moduleGraph
+> check