Add unit test for big clipboard device message

Test clipboard synchronization from the device to the computer.

app/tests/test_device_msg_deserialize.c

@@ -4,6 +4,7 @@
 #include "device_msg.h"
 
 #include <stdio.h>
+
 static void test_deserialize_clipboard(void) {
     const unsigned char input[] = {
         DEVICE_MSG_TYPE_CLIPBOARD,
@@ -22,7 +23,28 @@ static void test_deserialize_clipboard(void) {
     device_msg_destroy(&msg);
 }
 
+static void test_deserialize_clipboard_big(void) {
+    unsigned char input[DEVICE_MSG_SERIALIZED_MAX_SIZE];
+    input[0] = DEVICE_MSG_TYPE_CLIPBOARD;
+    input[1] = DEVICE_MSG_TEXT_MAX_LENGTH >> 8; // MSB
+    input[2] = DEVICE_MSG_TEXT_MAX_LENGTH & 0xff; // LSB
+
+    memset(input + 3, 'a', DEVICE_MSG_TEXT_MAX_LENGTH);
+
+    struct device_msg msg;
+    ssize_t r = device_msg_deserialize(input, sizeof(input), &msg);
+    assert(r == DEVICE_MSG_SERIALIZED_MAX_SIZE);
+
+    assert(msg.type == DEVICE_MSG_TYPE_CLIPBOARD);
+    assert(msg.clipboard.text);
+    assert(strlen(msg.clipboard.text) == DEVICE_MSG_TEXT_MAX_LENGTH);
+    assert(msg.clipboard.text[0] == 'a');
+
+    device_msg_destroy(&msg);
+}
+
 int main(void) {
     test_deserialize_clipboard();
+    test_deserialize_clipboard_big();
     return 0;
 }