Add RemoteTestCase and RemoteError to samba.subunit.

Change-Id: Ib3946cf4eae69f53270a299660f6029290d3791a
Signed-off-by: Jelmer Vernooij <jelmer@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

python/samba/subunit/__init__.py

@@ -18,6 +18,7 @@
 """Subunit test protocol."""
 
 import datetime
+import unittest
 
 
 PROGRESS_SET = 0
@@ -44,3 +45,61 @@ class UTC(datetime.tzinfo):
         return _ZERO
 
 utc = UTC()
+
+
+def RemoteError(description=""):
+    return (Exception, Exception(description), None)
+
+
+class RemotedTestCase(unittest.TestCase):
+    """A class to represent test cases run in child processes.
+
+    Instances of this class are used to provide the Python test API a TestCase
+    that can be printed to the screen, introspected for metadata and so on.
+    However, as they are a simply a memoisation of a test that was actually
+    run in the past by a separate process, they cannot perform any interactive
+    actions.
+    """
+
+    def __eq__ (self, other):
+        try:
+            return self.__description == other.__description
+        except AttributeError:
+            return False
+
+    def __init__(self, description):
+        """Create a psuedo test case with description description."""
+        self.__description = description
+
+    def error(self, label):
+        raise NotImplementedError("%s on RemotedTestCases is not permitted." %
+            label)
+
+    def setUp(self):
+        self.error("setUp")
+
+    def tearDown(self):
+        self.error("tearDown")
+
+    def shortDescription(self):
+        return self.__description
+
+    def id(self):
+        return "%s" % (self.__description,)
+
+    def __str__(self):
+        return "%s (%s)" % (self.__description, self._strclass())
+
+    def __repr__(self):
+        return "<%s description='%s'>" % \
+               (self._strclass(), self.__description)
+
+    def run(self, result=None):
+        if result is None: result = self.defaultTestResult()
+        result.startTest(self)
+        result.addError(self, RemoteError("Cannot run RemotedTestCases.\n"))
+        result.stopTest(self)
+
+    def _strclass(self):
+        cls = self.__class__
+        return "%s.%s" % (cls.__module__, cls.__name__)