add an UnitTest for Histogram

xchart/src/test/java/com/xeiam/xchart/HistogramTest.java

@@ -16,9 +16,7 @@
 package com.xeiam.xchart;
 
 import static org.fest.assertions.api.Assertions.assertThat;
-
 import java.util.Arrays;
-
 import org.junit.Test;
 
 /**
@@ -39,8 +37,9 @@ public class HistogramTest {
     //    Chart chart = new ChartBuilder().chartType(ChartType.Bar).width(800).height(600).build();
     //    chart.addSeries("histogram 1", histogram.getxAxisData(), histogram.getyAxisData());
     //    new SwingWrapper(chart).displayChart();
+  }
 
-  }@Test
+  @Test
   public void testNegetiveValues() {
 
     Histogram histogram = new Histogram(Arrays.asList(-1, -2, -3, -4, -5, -6), 3);
@@ -49,4 +48,5 @@ public class HistogramTest {
     assertThat(histogram.getMin()).isEqualTo(-6);
     assertThat(histogram.getNumBins()).isEqualTo(3);
   }
+
 }