[foozzie] Add some system tests.

tools/foozzie/v8_foozzie_test.py

Index: tools/foozzie/v8_foozzie_test.py
diff --git a/tools/foozzie/v8_foozzie_test.py b/tools/foozzie/v8_foozzie_test.py
index de5516f80685e9fce35dd568c9666a9e3a3881f2..be085035ac2d05cedf5b672d93edbb83afb74f89 100644
--- a/tools/foozzie/v8_foozzie_test.py
+++ b/tools/foozzie/v8_foozzie_test.py
@@ -2,11 +2,19 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
+import subprocess
+import sys
 import unittest
 
+import v8_foozzie
 import v8_suppressions
 
-class FuzzerTest(unittest.TestCase):
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+FOOZZIE = os.path.join(BASE_DIR, 'v8_foozzie.py')
+TEST_DATA = os.path.join(BASE_DIR, 'testdata')
+
+class UnitTest(unittest.TestCase):
   def testDiff(self):
     # TODO(machenbach): Mock out suppression configuration.
     suppress = v8_suppressions.get_suppression(
@@ -75,3 +83,29 @@ otherfile.js: TypeError: undefined is not a constructor
     diff = """- somefile.js: TypeError: undefined is not a constructor
 + otherfile.js: TypeError: undefined is not a constructor"""
     self.assertEquals(diff, suppress.diff(one, two))
+
+
+def run_foozzie(first_d8, second_d8):
+  return subprocess.check_output([
+    sys.executable, FOOZZIE,
+    '--random-seed', '12345',
+    '--first-d8', os.path.join(TEST_DATA, first_d8),
+    '--second-d8', os.path.join(TEST_DATA, second_d8),
+    '--second-config', 'ignition_staging',
+    os.path.join(TEST_DATA, 'fuzz-test1.js'),
+  ])
+
+
+class SystemTest(unittest.TestCase):
+  def testSyntaxErrorDiffPass(self):
+    stdout = run_foozzie('test_d8_1.py', 'test_d8_2.py')
+    self.assertEquals('# V8 correctness - pass\n', stdout)
+
+  def testDifferentOutputFail(self):
+    with open(os.path.join(TEST_DATA, 'failure_output.txt')) as f:
+      expected_output = f.read()
+    with self.assertRaises(subprocess.CalledProcessError) as ctx:
+      run_foozzie('test_d8_1.py', 'test_d8_3.py')
+    e = ctx.exception
+    self.assertEquals(v8_foozzie.RETURN_FAIL, e.returncode)
+    self.assertEquals(expected_output, e.output)