Added unit tests

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

@@ -17,9 +17,4 @@ trait ToolCommandFunction extends BiopetJavaCommandLineFunction with Version {
     javaMainClass = toolObject.getClass.getName.takeWhile(_ != '$')
     super.beforeGraph()
   }
-
-  override def freezeFieldValues(): Unit = {
-    javaMainClass = toolObject.getClass.getName.takeWhile(_ != '$')
-    super.freezeFieldValues()
-  }
 }

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

+package nl.lumc.sasc.biopet.core
+
+import org.scalatest.Matchers
+import org.scalatest.testng.TestNGSuite
+import org.testng.annotations.Test
+import nl.lumc.sasc.biopet.FullVersion
+
+/**
+  * Created by pjvanthof on 16/11/15.
+  */
+class ToolCommandTest extends TestNGSuite with Matchers {
+  @Test
+  def testToolCommand: Unit = {
+    val tool = new ToolCommandFunction {
+      val root = null
+      val toolObject = ToolCommandTest
+    }
+
+    tool.versionCommand shouldBe empty
+    tool.versionRegex.toString() shouldBe empty
+    tool.getVersion shouldBe Some("Biopet " + FullVersion)
+    tool.beforeGraph
+
+    tool.javaMainClass shouldBe ToolCommandTest.getClass.getName.takeWhile(_ != '$')
+  }
+}
+
+object ToolCommandTest {
+
+}
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