Add some testing

src/test/java/org/bukkit/StatisticTest.java

@@ -0,0 +1,22 @@
+package org.bukkit;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import org.junit.Test;
+
+public class StatisticTest {
+    @Test
+    public void getDeprecated() {
+        for (Statistic statistic : Statistic.values()) {
+            assertThat(Statistic.getStatistic(statistic.getId()), is(statistic));
+        }
+    }
+
+    @Test
+    public void getById() {
+        for (Statistic statistic : Statistic.values()) {
+            assertThat(Statistic.getById(statistic.getId()), is(statistic));
+        }
+    }
+}