[foozzie] Initial correctness fuzzer harness.

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
new file mode 100644
index 0000000000000000000000000000000000000000..de5516f80685e9fce35dd568c9666a9e3a3881f2
--- /dev/null
+++ b/tools/foozzie/v8_foozzie_test.py
@@ -0,0 +1,77 @@
+# Copyright 2016 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import unittest
+
+import v8_suppressions
+
+class FuzzerTest(unittest.TestCase):
+  def testDiff(self):
+    # TODO(machenbach): Mock out suppression configuration.
+    suppress = v8_suppressions.get_suppression(
+        'x64', 'fullcode', 'x64', 'default')
+    one = ''
+    two = ''
+    diff = None
+    self.assertEquals(diff, suppress.diff(one, two))
+
+    one = 'a \n  b\nc();'
+    two = 'a \n  b\nc();'
+    diff = None
+    self.assertEquals(diff, suppress.diff(one, two))
+
+    # Ignore line before caret, caret position, stack trace char numbers
+    # error message and validator output.
+    one = """
+undefined
+weird stuff
+      ^
+Validation of asm.js module failed: foo bar
+somefile.js: TypeError: undefined is not a function
+stack line :15: foo
+  undefined
+"""
+    two = """
+undefined
+other weird stuff
+            ^
+somefile.js: TypeError: baz is not a function
+stack line :2: foo
+Validation of asm.js module failed: baz
+  undefined
+"""
+    diff = None
+    self.assertEquals(diff, suppress.diff(one, two))
+
+    one = """
+Still equal
+Extra line
+"""
+    two = """
+Still equal
+"""
+    diff = '- Extra line'
+    self.assertEquals(diff, suppress.diff(one, two))
+
+    one = """
+Still equal
+"""
+    two = """
+Still equal
+Extra line
+"""
+    diff = '+ Extra line'
+    self.assertEquals(diff, suppress.diff(one, two))
+
+    one = """
+undefined
+somefile.js: TypeError: undefined is not a constructor
+"""
+    two = """
+undefined
+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))