support/testing: add python-pexpect tests

Add a simple test case to check the basic usage. Call 'login' and try
wrong user/password, expecting the 'Login incorrect' message.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_pexpect.py

@@ -0,0 +1,8 @@
+import pexpect
+
+p = pexpect.spawn(["login"])
+p.expect("login:")
+p.sendline("wrong")
+p.expect("Password:")
+p.sendline("wrong")
+p.expect("Login incorrect")