Rewrite NsJail tests

* Fix SIGSEGV test
* Add embedded null byte test
* Return None for stderr when there's a ValueError

1 files changed, 77 insertions, 0 deletions

diff --git a/tests/test_nsjail.py b/tests/test_nsjail.py
new file mode 100644
index 0000000..1184b87
--- /dev/null
+++ b/tests/test_nsjail.py
@@ -0,0 +1,77 @@
+import logging
+import unittest
+from textwrap import dedent
+
+from snekbox.nsjail import NsJail
+
+
+class NsJailTests(unittest.TestCase):
+    def setUp(self):
+        super().setUp()
+
+        self.nsjail = NsJail()
+        self.logger = logging.getLogger("snekbox.nsjail")
+
+    def test_print_returns_0(self):
+        result = self.nsjail.python3("print('test')")
+        self.assertEqual(result.returncode, 0)
+        self.assertEqual(result.stdout, "test\n")
+        self.assertEqual(result.stderr, None)
+
+    def test_timeout_returns_137(self):
+        code = dedent("""
+            x = '*'
+            while True:
+                try:
+                    x = x * 99
+                except:
+                    continue
+        """).strip()
+
+        with self.assertLogs(self.logger) as log:
+            result = self.nsjail.python3(code)
+
+        self.assertEqual(result.returncode, 137)
+        self.assertEqual(result.stdout, "")
+        self.assertEqual(result.stderr, None)
+        self.assertIn("run time >= time limit", "\n".join(log.output))
+
+    def test_subprocess_resource_unavailable(self):
+        code = dedent("""
+            import subprocess
+            print(subprocess.check_output('kill -9 6', shell=True).decode())
+        """).strip()
+
+        result = self.nsjail.python3(code)
+        self.assertEqual(result.returncode, 1)
+        self.assertIn("Resource temporarily unavailable", result.stdout)
+        self.assertEqual(result.stderr, None)
+
+    def test_forkbomb_resource_unavailable(self):
+        code = dedent("""
+            import os
+            while 1:
+                os.fork()
+        """).strip()
+
+        result = self.nsjail.python3(code)
+        self.assertEqual(result.returncode, 1)
+        self.assertIn("Resource temporarily unavailable", result.stdout)
+        self.assertEqual(result.stderr, None)
+
+    def test_sigsegv_returns_139(self):  # In honour of Juan.
+        code = dedent("""
+            import ctypes
+            ctypes.string_at(0)
+        """).strip()
+
+        result = self.nsjail.python3(code)
+        self.assertEqual(result.returncode, 139)
+        self.assertEqual(result.stdout, "")
+        self.assertEqual(result.stderr, None)
+
+    def test_null_byte_value_error(self):
+        result = self.nsjail.python3("\0")
+        self.assertEqual(result.returncode, None)
+        self.assertEqual(result.stdout, "ValueError: embedded null byte")
+        self.assertEqual(result.stderr, None)