[fusl] Add llvm's lit tool to third_party

third_party/lit/lit/LitTestCase.py

Index: third_party/lit/lit/LitTestCase.py
diff --git a/third_party/lit/lit/LitTestCase.py b/third_party/lit/lit/LitTestCase.py
new file mode 100644
index 0000000000000000000000000000000000000000..e04846c7bd6a49b7e6ad20f7cff5096142dba333
--- /dev/null
+++ b/third_party/lit/lit/LitTestCase.py
@@ -0,0 +1,34 @@
+from __future__ import absolute_import
+import unittest
+
+import lit.Test
+
+"""
+TestCase adaptor for providing a 'unittest' compatible interface to 'lit' tests.
+"""
+
+class UnresolvedError(RuntimeError):
+    pass
+        
+class LitTestCase(unittest.TestCase):
+    def __init__(self, test, run):
+        unittest.TestCase.__init__(self)
+        self._test = test
+        self._run = run
+
+    def id(self):
+        return self._test.getFullName()
+
+    def shortDescription(self):
+        return self._test.getFullName()
+
+    def runTest(self):
+        # Run the test.
+        self._run.execute_test(self._test)
+
+        # Adapt the result to unittest.
+        result = self._test.result
+        if result.code is lit.Test.UNRESOLVED:
+            raise UnresolvedError(result.output)
+        elif result.code.isFailure:
+            self.fail(result.output)