Added a 'source' for commands that may be passed around in the context

src/test/java/net/minecraft/commands/tree/ArgumentCommandNodeTest.java

@@ -15,7 +15,7 @@ import static org.mockito.Mockito.mock;
 
 public class ArgumentCommandNodeTest extends AbstractCommandNodeTest {
     ArgumentCommandNode node;
-    CommandContextBuilder contextBuilder;
+    CommandContextBuilder<Object> contextBuilder;
 
     @Override
     protected CommandNode getCommandNode() {
@@ -25,7 +25,7 @@ public class ArgumentCommandNodeTest extends AbstractCommandNodeTest {
     @Before
     public void setUp() throws Exception {
         node = argument("foo", integer()).build();
-        contextBuilder = new CommandContextBuilder();
+        contextBuilder = new CommandContextBuilder<Object>(new Object());
     }
 
     @Test

src/test/java/net/minecraft/commands/tree/LiteralCommandNodeTest.java

@@ -14,7 +14,7 @@ import static org.mockito.Mockito.mock;
 
 public class LiteralCommandNodeTest extends AbstractCommandNodeTest {
     LiteralCommandNode node;
-    CommandContextBuilder contextBuilder;
+    CommandContextBuilder<Object> contextBuilder;
 
     @Override
     protected CommandNode getCommandNode() {
@@ -24,7 +24,7 @@ public class LiteralCommandNodeTest extends AbstractCommandNodeTest {
     @Before
     public void setUp() throws Exception {
         node = literal("foo").build();
-        contextBuilder = new CommandContextBuilder();
+        contextBuilder = new CommandContextBuilder<Object>(new Object());
     }
 
     @Test

src/test/java/net/minecraft/commands/tree/RootCommandNodeTest.java

@@ -24,7 +24,7 @@ public class RootCommandNodeTest extends AbstractCommandNodeTest {
 
     @Test
     public void testParse() throws Exception {
-        assertThat(node.parse("foo bar baz", new CommandContextBuilder()), is("foo bar baz"));
+        assertThat(node.parse("foo bar baz", new CommandContextBuilder<Object>(new Object())), is("foo bar baz"));
     }
 
     @Test(expected = UnsupportedOperationException.class)