Add isSolid() tests for each material

By: Wesley Wolfe <weswolf@aol.com>

paper-server/src/test/java/org/bukkit/PerMaterialTest.java

@@ -0,0 +1,45 @@
+package org.bukkit;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.server.AchievementList;
+import net.minecraft.server.Block;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class PerMaterialTest {
+    static {
+        AchievementList.a();
+    }
+
+    @Parameters(name= "{index}: {0}")
+    public static List<Object[]> data() {
+        List<Object[]> list = new ArrayList<Object[]>();
+        for (Material material : Material.values()) {
+            list.add(new Object[] {material});
+        }
+        return list;
+    }
+
+    @Parameter public Material material;
+
+    @Test
+    public void isSolid() {
+        if (material == Material.AIR) {
+            assertFalse(material.isSolid());
+        } else if (material.isBlock()) {
+            assertThat(material.isSolid(), is(Block.byId[material.getId()].material.isSolid()));
+        } else {
+            assertFalse(material.isSolid());
+        }
+    }
+}