tests/shell: add test case for exceeding lines

Co-authored-by: Juan Carrano <j.carrano@fu-berlin.de>

tests/shell/tests/01-run.py

@@ -60,6 +60,13 @@
 
 BOARD = os.environ['BOARD']
 
+
+def print_error(message):
+    FAIL = '\033[91m'
+    ENDC = '\033[0m'
+    print(FAIL + message + ENDC)
+
+
 def check_cmd(child, cmd, expected):
     child.expect(PROMPT)
     child.sendline(cmd)
@@ -79,6 +86,20 @@ def check_and_get_bufsize(child):
     return bufsize
 
 
+def check_line_exceeded(child, bufsize):
+
+    if BOARD == 'nrf52dk':
+        # looks like the nrf52dk runs in to undefined behaviour when sending more
+        # than 64 bytes over UART
+        print_error('test case "check_line_exceeded" broken for nrf52dk. SKIP')
+        return
+
+    longline = "_"*bufsize + "verylong"
+
+    child.sendline(longline)
+    child.expect('shell: maximum line length exceeded')
+
+
 def check_line_canceling(child):
     child.expect(PROMPT)
     child.sendline('garbage1234' + CONTROL_C)
@@ -97,6 +118,8 @@ def testfunc(child):
 
     bufsize = check_and_get_bufsize(child)
 
+    check_line_exceeded(child, bufsize)
+
     check_line_canceling(child)
 
     # loop other defined commands and expected output