diff --git a/ContentGrabbingJi-framework-api/src/test/java/net/lamgc/cgj/bot/framework/message/MessageTest.java b/ContentGrabbingJi-framework-api/src/test/java/net/lamgc/cgj/bot/framework/message/MessageTest.java
new file mode 100644
index 0000000..abf2901
--- /dev/null
+++ b/ContentGrabbingJi-framework-api/src/test/java/net/lamgc/cgj/bot/framework/message/MessageTest.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2020  LamGC
+ *
+ * ContentGrabbingJi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * ContentGrabbingJi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.lamgc.cgj.bot.framework.message;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Random;
+
+import static org.junit.Assert.*;
+
+/**
+ * @see Message
+ */
+public class MessageTest {
+
+    private final static String TEST_CONTENT = "test";
+
+    @Test
+    public void lengthTest() {
+        Assert.assertEquals(TEST_CONTENT.length(), new TestMessage().length());
+    }
+
+    @Test
+    public void charAtTest() {
+        final int targetCharIndex = new Random().nextInt(TEST_CONTENT.length());
+
+        Assert.assertEquals(TEST_CONTENT.charAt(targetCharIndex), new TestMessage().charAt(targetCharIndex));
+    }
+
+    @Test
+    public void subSequenceTest() {
+        final int startsIndex = 1;
+        final int endsIndex = 3;
+
+        Assert.assertEquals(TEST_CONTENT.subSequence(startsIndex, endsIndex),
+                new TestMessage().subSequence(startsIndex, endsIndex));
+    }
+
+    private final static class TestMessage implements Message {
+        @Override
+        public String contentToString() {
+            return TEST_CONTENT;
+        }
+    }
+
+}
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