added testDotFileGeneration

it is a sbt-scripted project to test the dot generation process.

src/sbt-test/sbt-dependency-graph/testDotFileGeneration/project/build.scala

@@ -0,0 +1,75 @@
+import collection.mutable.ListBuffer
+import net.virtualvoid.sbt.graph.Plugin._
+
+import sbt._
+import sbt.Keys._
+
+object Build extends sbt.Build {
+
+
+  lazy val justATransiviteDependencyEndpointProject =  Project(
+    id = "just-a-transitive-dependency-endpoint",
+    base = file("."),
+    settings = Defaults.defaultSettings
+  )
+  lazy val justATransitiveDependencyProject = Project(
+    id = "just-a-transitive-dependency",
+    base = file("."),
+    settings = Defaults.defaultSettings
+  ).dependsOn(justATransiviteDependencyEndpointProject)
+
+  lazy val justADependencyProject = Project(
+    id = "just-a-dependency",
+    base = file("."),
+    settings = Defaults.defaultSettings
+  )
+
+  lazy val test_project =
+    Project(
+      id = "test-dot-file-generation",
+      base = file("."),
+      settings = Defaults.defaultSettings ++
+        graphSettings ++ Seq(
+          sbtVersion := "0.12.1",
+          scalaVersion := "2.9.2",
+          resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/",
+
+          TaskKey[Unit]("check") <<= (dependencyDot in Compile) map { (dotFile) =>
+            def sanitize(str: String): String = str.split('\n').drop(1).mkString("\n")
+              val expectedGraph =
+                """digraph "dependency-graph" {
+                  |    graph[rankdir="LR"]
+                  |    node [
+                  |        shape="record"
+                  |    ]
+                  |    edge [
+                  |        arrowtail="none"
+                  |    ]
+                  |    "test-dot-file-generation:test-dot-file-generation_2.9.2:0.1-SNAPSHOT" -> "just-a-transitive-dependency:just-a-transitive-dependency_2.9.2:0.1-SNAPSHOT"
+                  |    "just-a-transitive-dependency:just-a-transitive-dependency_2.9.2:0.1-SNAPSHOT" -> "just-a-transitive-dependency-endpoint:just-a-transitive-dependency-endpoint_2.9.2:0.1-SNAPSHOT"
+                  |    "test-dot-file-generation:test-dot-file-generation_2.9.2:0.1-SNAPSHOT" -> "just-a-dependency:just-a-dependency_2.9.2:0.1-SNAPSHOT"
+                  |}
+                """.stripMargin
+
+              val graph : String = scala.io.Source.fromFile(dotFile.getAbsolutePath).mkString
+              val errors = compareByLine(graph, expectedGraph)
+              require(errors.isEmpty , errors.mkString("\n"))
+              ()
+          }
+        )
+    ).dependsOn(justADependencyProject, justATransitiveDependencyProject)
+
+    def compareByLine(got : String, expected : String) : Seq[String] = {
+      val errors = ListBuffer[String]()
+      got.split("\n").zip(expected.split("\n").toSeq).zipWithIndex.foreach { case((got_line : String, expected_line : String), i : Int) =>
+        if(got_line != expected_line) {
+          errors.append(
+            """not matching lines at line %s
+              |expected: %s
+              |got:      %s
+              |""".stripMargin.format(i,expected_line, got_line))
+        }
+      }
+      errors
+    }
+}

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

@@ -0,0 +1 @@
+../../plugins.sbt

src/sbt-test/sbt-dependency-graph/testDotFileGeneration/test

@@ -0,0 +1 @@
+> test-dot-file-generation/check