public void testIsWellFormed_4BytesSamples() {
    // Valid 4 byte.
    assertWellFormed(0xF0, 0xA4, 0xAD, 0xA2);
    // Bad trailing bytes
    assertNotWellFormed(0xF0, 0xA4, 0xAD, 0x7F);
    assertNotWellFormed(0xF0, 0xA4, 0xAD, 0xC0);
    // Special cases for byte2
    assertNotWellFormed(0xF0, 0x8F, 0xAD, 0xA2);
    assertNotWellFormed(0xF4, 0x90, 0xAD, 0xA2);
  }

  /** Tests some hard-coded test cases. */

0x64, 0x61, 0x74, 0x61, 0xc4, 0x4, 0x74, 0x72, 0x75, 0x65, 0xa7, 0x4d, 0x65, 0x74, 0x61, 0x55, 0x73, 0x72, 0x82, 0xac, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x74, 0x79, 0x70, 0x65, 0xb8, 0x61, 0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x6f, 0x63, 0x74, 0x65, 0x74, 0x2d, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d, 0xa4, 0x65, 0x74, 0x61, 0x67, 0xd9, 0x20, 0x62, 0x65, 0x65, 0x62, 0x32, 0x32, 0x30, 0x66, 0x61, 0x39, 0x64, 0x65, 0x36, 0x31, 0x36, 0x36, 0x62, 0x64, 0x31, 0x66,...

	o = append(o, 0xbf, 0x64, 0x65, 0x70, 0x65, 0x6e, 0x64, 0x47, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x42, 0x61, 0x63, 0x6b, 0x67, 0x72, 0x6f, 0x75, 0x6e, 0x64, 0x48, 0x65, 0x61, 0x6c, 0x53, 0x74, 0x61, 0x74, 0x65)
	o = msgp.AppendBool(o, z.dependGlobalBackgroundHealState)
	// string "dependBucketTargetSys"
	o = append(o, 0xb5, 0x64, 0x65, 0x70, 0x65, 0x6e, 0x64, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74, 0x54, 0x61, 0x72, 0x67, 0x65, 0x74, 0x53, 0x79, 0x73)

	// string "Name"
	o = append(o, 0x89, 0xa4, 0x4e, 0x61, 0x6d, 0x65)
	o = msgp.AppendString(o, z.Name)
	// string "Writer"
	o = append(o, 0xa6, 0x57, 0x72, 0x69, 0x74, 0x65, 0x72)
	o = msgp.AppendBool(o, z.Writer)
	// string "UID"
	o = append(o, 0xa3, 0x55, 0x49, 0x44)
	o = msgp.AppendString(o, z.UID)
	// string "Timestamp"
	o = append(o, 0xa9, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70)

	// string "LastFailedCount"
	o = append(o, 0x83, 0xaf, 0x4c, 0x61, 0x73, 0x74, 0x46, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendUint64(o, z.LastFailedCount)
	// string "TotalDroppedCount"
	o = append(o, 0xb1, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x44, 0x72, 0x6f, 0x70, 0x70, 0x65, 0x64, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendUint64(o, z.TotalDroppedCount)
	// string "TotalDroppedBytes"

	// string "CreatedAfter"
	o = append(o, 0xac, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x41, 0x66, 0x74, 0x65, 0x72)
	o = msgp.AppendTime(o, z.CreatedAfter)
	// string "CreatedBefore"
	o = append(o, 0xad, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x42, 0x65, 0x66, 0x6f, 0x72, 0x65)
	o = msgp.AppendTime(o, z.CreatedBefore)
	// string "Tags"
	o = append(o, 0xa4, 0x54, 0x61, 0x67, 0x73)
	o = msgp.AppendArrayHeader(o, uint32(len(z.Tags)))

	// map header, size 3
	// string "Free"
	o = append(o, 0x83, 0xa4, 0x46, 0x72, 0x65, 0x65)
	o = msgp.AppendInt64(o, z.Free)
	// string "Total"
	o = append(o, 0xa5, 0x54, 0x6f, 0x74, 0x61, 0x6c)
	o = msgp.AppendInt64(o, z.Total)
	// string "Used"
	o = append(o, 0xa4, 0x55, 0x73, 0x65, 0x64)
	o = msgp.AppendInt64(o, z.Used)
	return
}

// UnmarshalMsg implements msgp.Unmarshaler

	o = append(o, 0x87, 0xa9, 0x4e, 0x65, 0x77, 0x65, 0x72, 0x54, 0x68, 0x61, 0x6e)
	o = msgp.AppendDuration(o, z.NewerThan)
	// string "OlderThan"
	o = append(o, 0xa9, 0x4f, 0x6c, 0x64, 0x65, 0x72, 0x54, 0x68, 0x61, 0x6e)
	o = msgp.AppendDuration(o, z.OlderThan)
	// string "CreatedAfter"
	o = append(o, 0xac, 0x43, 0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x41, 0x66, 0x74, 0x65, 0x72)
	o = msgp.AppendTime(o, z.CreatedAfter)

	o = msgp.AppendTime(o, z.LastUpdate)
	// string "ObjectsTotalCount"
	o = append(o, 0xb1, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x73, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x43, 0x6f, 0x75, 0x6e, 0x74)
	o = msgp.AppendUint64(o, z.ObjectsTotalCount)
	// string "ObjectsTotalSize"
	o = append(o, 0xb0, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x73, 0x54, 0x6f, 0x74, 0x61, 0x6c, 0x53, 0x69, 0x7a, 0x65)

	}
	// string "Tags"
	o = append(o, 0xa4, 0x54, 0x61, 0x67, 0x73)
	o = msgp.AppendArrayHeader(o, uint32(len(z.Tags)))
	for za0001 := range z.Tags {
		o, err = z.Tags[za0001].MarshalMsg(o)
		if err != nil {
			err = msgp.WrapError(err, "Tags", za0001)
			return
		}
	}
	// string "Metadata"
	o = append(o, 0xa8, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61)