Added commandbuilder.then() and argumentbuilder

src/main/test/net/minecraft/commands/builder/ArgumentBuilderTest.java

@@ -0,0 +1,29 @@
+package net.minecraft.commands.builder;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static net.minecraft.commands.arguments.IntegerArgumentType.integer;
+import static net.minecraft.commands.builder.RequiredArgumentBuilder.argument;
+import static org.hamcrest.Matchers.hasItems;
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+
+public class ArgumentBuilderTest {
+    ArgumentBuilder builder;
+
+    @Before
+    public void setUp() throws Exception {
+        builder = new ArgumentBuilder() {};
+    }
+
+    @Test
+    public void testArguments() throws Exception {
+        RequiredArgumentBuilder argument = argument("bar", integer());
+
+        builder.then(argument);
+
+        assertThat(builder.getArguments(), hasSize(1));
+        assertThat(builder.getArguments(), hasItems((ArgumentBuilder) argument));
+    }
+}

src/main/test/net/minecraft/commands/builder/CommandBuilderTest.java

@@ -0,0 +1,29 @@
+package net.minecraft.commands.builder;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static net.minecraft.commands.arguments.IntegerArgumentType.integer;
+import static net.minecraft.commands.builder.RequiredArgumentBuilder.argument;
+import static org.hamcrest.Matchers.hasItems;
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+
+public class CommandBuilderTest {
+    CommandBuilder builder;
+
+    @Before
+    public void setUp() throws Exception {
+        builder = new CommandBuilder("foo");
+    }
+
+    @Test
+    public void testArguments() throws Exception {
+        RequiredArgumentBuilder argument = argument("bar", integer());
+
+        builder.then(argument);
+
+        assertThat(builder.getArguments(), hasSize(1));
+        assertThat(builder.getArguments(), hasItems((ArgumentBuilder) argument));
+    }
+}