Added multisampleReport test

public/biopet-core/src/test/resources/empty_summary.json

 {
+  "samples": {
+    "sampleName": {
+      "libraries": {
+        "libName": {
 
+        }
+      }
+    }
+  }
 }
\ No newline at end of file

public/biopet-core/src/test/scala/nl/lumc/sasc/biopet/core/report/MultisampleReportBuilderTest.scala

+package nl.lumc.sasc.biopet.core.report
+
+import java.io.File
+import java.nio.file.Paths
+
+import com.google.common.io.Files
+import org.scalatest.Matchers
+import org.scalatest.testng.TestNGSuite
+import org.testng.annotations.Test
+
+/**
+  * Created by pjvanthof on 24/02/16.
+  */
+class MultisampleReportBuilderTest extends TestNGSuite with Matchers {
+  private def resourcePath(p: String): String = {
+    Paths.get(getClass.getResource(p).toURI).toString
+  }
+
+  @Test
+  def testGeneratePages(): Unit = {
+    val builder = new MultisampleReportBuilder {
+      def reportName: String = "test"
+      def indexPage: ReportPage = ReportPage("Samples" -> generateSamplesPage(Map()) :: Nil, Nil, Map())
+
+      def samplePage(sampleId: String, args: Map[String, Any]): ReportPage =
+        ReportPage("Libraries" -> generateLibraryPage(Map("sampleId" -> Some(sampleId))) :: Nil, Nil, Map())
+
+      def libraryPage(sampleId: String, libraryId: String, args: Map[String, Any]) = ReportPage(Nil, Nil, Map())
+    }
+
+    val tempDir = Files.createTempDir()
+    tempDir.deleteOnExit()
+    val args = Array("-s", resourcePath("/empty_summary.json"), "-o", tempDir.getAbsolutePath)
+    builder.main(args)
+    builder.extFiles.foreach(x => new File(tempDir, "ext" + File.separator + x.targetPath) should exist)
+    new File(tempDir, "index.html") should exist
+  }
+
+}