Added test on render method

public/biopet-core/src/main/scala/nl/lumc/sasc/biopet/core/report/ReportBuilder.scala

@@ -216,7 +216,7 @@ object ReportBuilder {
   protected val engine = new TemplateEngine()
 
   /** Cache of temp file for templates from the classpath / jar */
-  private var templateCache: Map[String, File] = Map()
+  private[report] var templateCache: Map[String, File] = Map()
 
   /** This will give the total number of pages including all nested pages */
   def countPages(page: ReportPage): Int = {

public/biopet-core/src/test/resources/template.ssp

+<%@ var arg: String%>
+${arg}
\ No newline at end of file

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

+package nl.lumc.sasc.biopet.core.report
+
+import org.scalatest.Matchers
+import org.scalatest.testng.TestNGSuite
+import org.testng.annotations.Test
+
+/**
+  * Created by pjvanthof on 24/02/16.
+  */
+class ReportBuilderTest extends TestNGSuite with Matchers {
+
+  @Test
+  def testRenderTemplate: Unit = {
+    ReportBuilder.templateCache = Map()
+    ReportBuilder.templateCache shouldBe empty
+    ReportBuilder.renderTemplate("/template.ssp", Map("arg" -> "test")) shouldBe "test"
+    ReportBuilder.templateCache.size shouldBe 1
+    ReportBuilder.renderTemplate("/template.ssp", Map("arg" -> "bla")) shouldBe "bla"
+    ReportBuilder.templateCache.size shouldBe 1
+  }
+}