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diff --git a/asm/src/test/java/org/objectweb/asm/ByteVectorTest.java b/asm/src/test/java/org/objectweb/asm/ByteVectorTest.java
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+// ASM: a very small and fast Java bytecode manipulation framework
+// Copyright (c) 2000-2011 INRIA, France Telecom
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+// 3. Neither the name of the copyright holders nor the names of its
+//    contributors may be used to endorse or promote products derived from
+//    this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+// THE POSSIBILITY OF SUCH DAMAGE.
+package org.objectweb.asm;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Arrays;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+/**
+ * Unit tests for {@link ByteVector}.
+ *
+ * @author Eric Bruneton
+ */
+class ByteVectorTest {
+
+  @Test
+  void testPutByte() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putByte(1);
+
+    assertArrayEquals(new byte[] {1}, toArray(byteVector));
+    assertEquals(1, byteVector.size());
+  }
+
+  @Test
+  void testPut11() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.put11(1, 2);
+
+    assertArrayEquals(new byte[] {1, 2}, toArray(byteVector));
+    assertEquals(2, byteVector.size());
+  }
+
+  @Test
+  void testPutShort() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putShort(0x0102);
+
+    assertArrayEquals(new byte[] {1, 2}, toArray(byteVector));
+    assertEquals(2, byteVector.size());
+  }
+
+  @Test
+  void testPut12() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.put12(1, 0x0203);
+
+    assertArrayEquals(new byte[] {1, 2, 3}, toArray(byteVector));
+    assertEquals(3, byteVector.size());
+  }
+
+  @Test
+  void testPut112() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.put112(1, 2, 0x0304);
+
+    assertArrayEquals(new byte[] {1, 2, 3, 4}, toArray(byteVector));
+    assertEquals(4, byteVector.size());
+  }
+
+  @Test
+  void testPutInt() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putInt(0x01020304);
+
+    assertArrayEquals(new byte[] {1, 2, 3, 4}, toArray(byteVector));
+    assertEquals(4, byteVector.size());
+  }
+
+  @Test
+  void testPut122() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.put122(1, 0x0203, 0x0405);
+
+    assertArrayEquals(new byte[] {1, 2, 3, 4, 5}, toArray(byteVector));
+    assertEquals(5, byteVector.size());
+  }
+
+  @Test
+  void testPutLong() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putLong(0x0102030405060708L);
+
+    assertArrayEquals(new byte[] {1, 2, 3, 4, 5, 6, 7, 8}, toArray(byteVector));
+    assertEquals(8, byteVector.size());
+  }
+
+  @Test
+  void testPutUtf8_ascii() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putUTF8("abc");
+
+    assertArrayEquals(new byte[] {0, 3, 'a', 'b', 'c'}, toArray(byteVector));
+    assertEquals(5, byteVector.size());
+  }
+
+  @ParameterizedTest
+  @ValueSource(ints = {65535, 65536})
+  void testPutUtf8_ascii_tooLarge(final int size) {
+    ByteVector byteVector = new ByteVector(0);
+    char[] charBuffer = new char[size];
+    Arrays.fill(charBuffer, 'A');
+
+    Executable putUtf8 = () -> byteVector.putUTF8(new String(charBuffer));
+
+    if (size > 65535) {
+      Exception exception = assertThrows(IllegalArgumentException.class, putUtf8);
+      assertEquals("UTF8 string too large", exception.getMessage());
+    } else {
+      assertDoesNotThrow(putUtf8);
+    }
+  }
+
+  @Test
+  void testPutUtf8_unicode() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putUTF8(new String(new char[] {'a', 0x0000, 0x0080, 0x0800}));
+
+    assertArrayEquals(
+        new byte[] {0, 8, 'a', -64, -128, -62, -128, -32, -96, -128}, toArray(byteVector));
+  }
+
+  @Test
+  void testPutUtf8_unicode_tooLarge() {
+    ByteVector byteVector = new ByteVector(0);
+    char[] charBuffer = new char[32768];
+    Arrays.fill(charBuffer, (char) 0x07FF);
+
+    Executable putUtf8 = () -> byteVector.putUTF8(new String(charBuffer));
+
+    Exception exception = assertThrows(IllegalArgumentException.class, putUtf8);
+    assertEquals("UTF8 string too large", exception.getMessage());
+  }
+
+  @Test
+  void testPutByteArray() {
+    ByteVector byteVector = new ByteVector(0);
+
+    byteVector.putByteArray(new byte[] {0, 1, 2, 3, 4, 5}, 1, 3);
+
+    assertArrayEquals(new byte[] {1, 2, 3}, toArray(byteVector));
+    assertEquals(3, byteVector.size());
+  }
+
+  private static byte[] toArray(final ByteVector byteVector) {
+    byte[] result = new byte[byteVector.length];
+    System.arraycopy(byteVector.data, 0, result, 0, byteVector.length);
+    return result;
+  }
+}