selftests/functional: Add Ctrl+C behavior test

Run avocado in a long test, interrupt it and verify if
the runner displays the appropriate behavior, in terms
of exit code and output.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

selftests/all/functional/avocado/basic_tests.py

@@ -17,6 +17,7 @@
 import json
 import unittest
 import os
+import signal
 import shutil
 import sys
 import tempfile
@@ -113,6 +114,25 @@ class RunnerOperationTest(unittest.TestCase):
         self.assertEqual(result.exit_status, expected_rc,
                          "Avocado did not return rc %d:\n%s" % (expected_rc, result))
 
+    def test_runner_ctrl_c(self):
+        os.chdir(basedir)
+        cmd_line = './scripts/avocado run sleeptenmin'
+        sp = process.SubProcess(cmd_line)
+        # Let it run for 3 seconds, then send a SIGINT
+        # (translates to KeyboardInterrupt)
+        sp.wait(timeout=3, sig=signal.SIGINT)
+        result = sp.result
+        output = result.stdout + result.stderr
+        expected_rc = 2
+        unexpected_rc = 3
+        self.assertNotEqual(result.exit_status, unexpected_rc,
+                            "Avocado crashed (rc %d):\n%s" % (unexpected_rc, result))
+        self.assertEqual(result.exit_status, expected_rc,
+                         "Avocado did not return rc %d:\n%s" % (expected_rc, result))
+        self.assertIn("Interrupted by user request", output,
+                      "Avocado did not display interruption message. "
+                      "Output:\n%s" % output)
+
 
 class RunnerDropinTest(unittest.TestCase):