add util to run python unittests

adding the function RunTests to each python unittest allows that the
test is executed either with the default TestRunner or an XMLTestRunner
for producing an XML output file. With no command line argument, the
default Runner is used (same behaviour as previously), with 'xml' as
the first argument, the XMLTestRunner is used.

.gitignore

@@ -58,3 +58,5 @@ Debug
 *_out.tab
 *_out.pickle
 /modules/io/tests/temp_img.tmp
+PYTEST-*.xml
+ost_*_tests_log.xml

modules/base/doc/base.rst

@@ -5,3 +5,4 @@
 
   logging
   settings
+  testutils

modules/base/doc/testutils.rst

+:mod:`~ost.testutils` -- Utils for Running Python Unittests
+================================================================================
+
+.. module:: ost.testutils
+  :synopsis: Helper Functions to Run Python Unittests
+
+.. autofunction:: ost.testutils.RunTests
\ No newline at end of file

modules/base/pymod/CMakeLists.txt

@@ -7,4 +7,4 @@ set(OST_BASE_PYMOD_SOURCES
 
 pymod(NAME base OUTPUT_DIR ost 
       CPP ${OST_BASE_PYMOD_SOURCES} 
-      PY __init__.py settings.py stutil.py table.py)
+      PY __init__.py settings.py stutil.py table.py xmlrunner.py testutils.py)

modules/base/pymod/testutils.py

+def RunTests():
+  '''
+  This function behaves as a custom TestLoader for python unittests.
+
+  With no system arguments, the default unittest TestRunner is used.
+
+  If the first system argument (sys.argv[1]) is set to 'xml', a XMLTestRunner
+  is used, which produces a JUnit compatible XML output file. Within the current
+  module, each function is identified which is a subclass of unittest.TestCase
+  and for each TestCase, a test suite is executed, producing an individual
+  output file for each TestCase. The output file has the name,
+  'PYTEST-<TestCaseName>.xml'.
+
+  Example of a Python testcase:
+
+  .. code-block:: python
+
+    import unittest
+
+    class TestRenumber(unittest.TestCase):
+
+      def setUp(self):
+        # prepare stuff"
+        pass
+
+      def testSomeFunction(self):
+        # do some asserts
+        pass
+
+    if __name__ == "__main__":
+      from ost import testutils
+      testutils.RunTests()
+
+  '''
+  import unittest
+  import sys
+  try:
+    if len(sys.argv)>1 and sys.argv[1]=='xml':
+      import inspect
+      import types
+      import __main__
+      from ost import xmlrunner
+      for name, obj in inspect.getmembers(__main__):
+        if (isinstance(obj, (type, types.ClassType)) and
+                            issubclass(obj, unittest.TestCase)):
+          suite = unittest.TestLoader().loadTestsFromTestCase(obj)
+          stream = open('PYTEST-%s.xml'%name, 'w')
+          xmlrunner.XMLTestRunner(stream).run(suite)
+          stream.close()
+
+    else:
+      unittest.main()
+  except Exception, e:
+    print e
\ No newline at end of file

modules/base/pymod/xmlrunner.py

+"""
+XML Test Runner for PyUnit
+"""
+
+# Written by Sebastian Rittau <srittau@jroger.in-berlin.de> and placed in
+# the Public Domain. With contributions by Paolo Borelli and others.
+
+from __future__ import with_statement
+
+__version__ = "0.1"
+
+import os.path
+import re
+import sys
+import time
+import traceback
+import unittest
+from xml.sax.saxutils import escape
+
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
+
+
+class _TestInfo(object):
+
+    """Information about a particular test.
+
+    Used by _XMLTestResult.
+
+    """
+
+    def __init__(self, test, time):
+        (self._class, self._method) = test.id().rsplit(".", 1)
+        self._time = time
+        self._error = None
+        self._failure = None
+
+    @staticmethod
+    def create_success(test, time):
+        """Create a _TestInfo instance for a successful test."""
+        return _TestInfo(test, time)
+
+    @staticmethod
+    def create_failure(test, time, failure):
+        """Create a _TestInfo instance for a failed test."""
+        info = _TestInfo(test, time)
+        info._failure = failure
+        return info
+
+    @staticmethod
+    def create_error(test, time, error):
+        """Create a _TestInfo instance for an erroneous test."""
+        info = _TestInfo(test, time)
+        info._error = error
+        return info
+
+    def print_report(self, stream):
+        """Print information about this test case in XML format to the
+        supplied stream.
+
+        """
+        stream.write('  <testcase classname="%(class)s" name="%(method)s" time="%(time).4f">' % \
+            {
+                "class": self._class,
+                "method": self._method,
+                "time": self._time,
+            })
+        if self._failure is not None:
+            self._print_error(stream, 'failure', self._failure)
+        if self._error is not None:
+            self._print_error(stream, 'error', self._error)
+        stream.write('</testcase>\n')
+
+    def _print_error(self, stream, tagname, error):
+        """Print information from a failure or error to the supplied stream."""
+        text = escape(str(error[1]))
+        stream.write('\n')
+        stream.write('    <%s type="%s">%s\n' \
+            % (tagname, _clsname(error[0]), text))
+        tb_stream = StringIO()
+        traceback.print_tb(error[2], None, tb_stream)
+        stream.write(escape(tb_stream.getvalue()))
+        stream.write('    </%s>\n' % tagname)
+        stream.write('  ')
+
+
+def _clsname(cls):
+    return cls.__module__ + "." + cls.__name__
+
+
+class _XMLTestResult(unittest.TestResult):
+
+    """A test result class that stores result as XML.
+
+    Used by XMLTestRunner.
+
+    """
+
+    def __init__(self, classname):
+        unittest.TestResult.__init__(self)
+        self._test_name = classname
+        self._start_time = None
+        self._tests = []
+        self._error = None
+        self._failure = None
+
+    def startTest(self, test):
+        unittest.TestResult.startTest(self, test)
+        self._error = None
+        self._failure = None
+        self._start_time = time.time()
+
+    def stopTest(self, test):
+        time_taken = time.time() - self._start_time
+        unittest.TestResult.stopTest(self, test)
+        if self._error:
+            info = _TestInfo.create_error(test, time_taken, self._error)
+        elif self._failure:
+            info = _TestInfo.create_failure(test, time_taken, self._failure)
+        else:
+            info = _TestInfo.create_success(test, time_taken)
+        self._tests.append(info)
+
+    def addError(self, test, err):
+        unittest.TestResult.addError(self, test, err)
+        self._error = err
+
+    def addFailure(self, test, err):
+        unittest.TestResult.addFailure(self, test, err)
+        self._failure = err
+
+    def print_report(self, stream, time_taken, out, err):
+        """Prints the XML report to the supplied stream.
+
+        The time the tests took to perform as well as the captured standard
+        output and standard error streams must be passed in.a
+
+        """
+        stream.write('<testsuite errors="%(e)d" failures="%(f)d" ' % \
+            { "e": len(self.errors), "f": len(self.failures) })
+        stream.write('name="%(n)s" tests="%(t)d" time="%(time).3f">\n' % \
+            {
+                "n": self._test_name,
+                "t": self.testsRun,
+                "time": time_taken,
+            })
+        for info in self._tests:
+            info.print_report(stream)
+        stream.write('  <system-out><![CDATA[%s]]></system-out>\n' % out)
+        stream.write('  <system-err><![CDATA[%s]]></system-err>\n' % err)
+        stream.write('</testsuite>\n')
+
+
+class XMLTestRunner(object):
+
+    """A test runner that stores results in XML format compatible with JUnit.
+
+    XMLTestRunner(stream=None) -> XML test runner
+
+    The XML file is written to the supplied stream. If stream is None, the
+    results are stored in a file called TEST-<module>.<class>.xml in the
+    current working directory (if not overridden with the path property),
+    where <module> and <class> are the module and class name of the test class.
+
+    """
+
+    def __init__(self, stream=None):
+        self._stream = stream
+        self._path = "."
+
+    def run(self, test):
+        """Run the given test case or test suite."""
+        class_ = test.__class__
+        classname = class_.__module__ + "." + class_.__name__
+        if self._stream == None:
+            filename = "TEST-%s.xml" % classname
+            stream = file(os.path.join(self._path, filename), "w")
+            stream.write('<?xml version="1.0" encoding="utf-8"?>\n')
+        else:
+            stream = self._stream
+
+        result = _XMLTestResult(classname)
+        start_time = time.time()
+
+        with _fake_std_streams():
+            test(result)
+            try:
+                out_s = sys.stdout.getvalue()
+            except AttributeError:
+                out_s = ""
+            try:
+                err_s = sys.stderr.getvalue()
+            except AttributeError:
+                err_s = ""
+
+        time_taken = time.time() - start_time
+        result.print_report(stream, time_taken, out_s, err_s)
+        if self._stream is None:
+            stream.close()
+
+        return result
+
+    def _set_path(self, path):
+        self._path = path
+
+    path = property(lambda self: self._path, _set_path, None,
+            """The path where the XML files are stored.
+
+            This property is ignored when the XML file is written to a file
+            stream.""")
+
+
+class _fake_std_streams(object):
+
+    def __enter__(self):
+        self._orig_stdout = sys.stdout
+        self._orig_stderr = sys.stderr
+        sys.stdout = StringIO()
+        sys.stderr = StringIO()
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        sys.stdout = self._orig_stdout
+        sys.stderr = self._orig_stderr
+
+
+class XMLTestRunnerTest(unittest.TestCase):
+
+    def setUp(self):
+        self._stream = StringIO()
+
+    def _try_test_run(self, test_class, expected):
+
+        """Run the test suite against the supplied test class and compare the
+        XML result against the expected XML string. Fail if the expected
+        string doesn't match the actual string. All time attributes in the
+        expected string should have the value "0.000". All error and failure
+        messages are reduced to "Foobar".
+
+        """
+
+        runner = XMLTestRunner(self._stream)
+        runner.run(unittest.makeSuite(test_class))
+
+        got = self._stream.getvalue()
+        # Replace all time="X.YYY" attributes by time="0.000" to enable a
+        # simple string comparison.
+        got = re.sub(r'time="\d+\.\d+"', 'time="0.000"', got)
+        # Likewise, replace all failure and error messages by a simple "Foobar"
+        # string.
+        got = re.sub(r'(?s)<failure (.*?)>.*?</failure>', r'<failure \1>Foobar</failure>', got)
+        got = re.sub(r'(?s)<error (.*?)>.*?</error>', r'<error \1>Foobar</error>', got)
+        # And finally Python 3 compatibility.
+        got = got.replace('type="builtins.', 'type="exceptions.')
+
+        self.assertEqual(expected, got)
+
+    def test_no_tests(self):
+        """Regression test: Check whether a test run without any tests
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            pass
+        self._try_test_run(TestTest, """<testsuite errors="0" failures="0" name="unittest.TestSuite" tests="0" time="0.000">
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>
+""")
+
+    def test_success(self):
+        """Regression test: Check whether a test run with a successful test
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                pass
+        self._try_test_run(TestTest, """<testsuite errors="0" failures="0" name="unittest.TestSuite" tests="1" time="0.000">
+  <testcase classname="__main__.TestTest" name="test_foo" time="0.000"></testcase>
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>
+""")
+
+    def test_failure(self):
+        """Regression test: Check whether a test run with a failing test
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                self.assert_(False)
+        self._try_test_run(TestTest, """<testsuite errors="0" failures="1" name="unittest.TestSuite" tests="1" time="0.000">
+  <testcase classname="__main__.TestTest" name="test_foo" time="0.000">
+    <failure type="exceptions.AssertionError">Foobar</failure>
+  </testcase>
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>
+""")
+
+    def test_error(self):
+        """Regression test: Check whether a test run with a erroneous test
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                raise IndexError()
+        self._try_test_run(TestTest, """<testsuite errors="1" failures="0" name="unittest.TestSuite" tests="1" time="0.000">
+  <testcase classname="__main__.TestTest" name="test_foo" time="0.000">
+    <error type="exceptions.IndexError">Foobar</error>
+  </testcase>
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>
+""")
+
+    def test_stdout_capture(self):
+        """Regression test: Check whether a test run with output to stdout
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                sys.stdout.write("Test\n")
+        self._try_test_run(TestTest, """<testsuite errors="0" failures="0" name="unittest.TestSuite" tests="1" time="0.000">
+  <testcase classname="__main__.TestTest" name="test_foo" time="0.000"></testcase>
+  <system-out><![CDATA[Test
+]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>
+""")
+
+    def test_stderr_capture(self):
+        """Regression test: Check whether a test run with output to stderr
+        matches a previous run.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                sys.stderr.write("Test\n")
+        self._try_test_run(TestTest, """<testsuite errors="0" failures="0" name="unittest.TestSuite" tests="1" time="0.000">
+  <testcase classname="__main__.TestTest" name="test_foo" time="0.000"></testcase>
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[Test
+]]></system-err>
+</testsuite>
+""")
+
+    class NullStream(object):
+        """A file-like object that discards everything written to it."""
+        def write(self, buffer):
+            pass
+
+    def test_unittests_changing_stdout(self):
+        """Check whether the XMLTestRunner recovers gracefully from unit tests
+        that change stdout, but don't change it back properly.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                sys.stdout = XMLTestRunnerTest.NullStream()
+
+        runner = XMLTestRunner(self._stream)
+        runner.run(unittest.makeSuite(TestTest))
+
+    def test_unittests_changing_stderr(self):
+        """Check whether the XMLTestRunner recovers gracefully from unit tests
+        that change stderr, but don't change it back properly.
+
+        """
+        class TestTest(unittest.TestCase):
+            def test_foo(self):
+                sys.stderr = XMLTestRunnerTest.NullStream()
+
+        runner = XMLTestRunner(self._stream)
+        runner.run(unittest.makeSuite(TestTest))
+
+
+if __name__ == "__main__":
+    unittest.main()