Moved the cxx_disable test case to C++ (did not get it to work with Python3 otherwise)

bob/core/test.cpp

@@ -206,7 +206,8 @@ static auto _output_disable_doc = bob::extension::FunctionDoc(
   "_test_output_disable",
   "Writes C++ messages with and without being visible"
 )
-.add_prototype("")
+.add_prototype("", "success")
+.add_return("success", "bool", "The success of the test")
 ;
 PyObject* output_disable(PyObject*, PyObject* args, PyObject* kwds) {
 BOB_TRY
@@ -214,27 +215,56 @@ BOB_TRY
 
   if (!PyArg_ParseTupleAndKeywords(args, kwds, "", kwlist)) return 0;
 
+  // redirect std::cout and std::cerr, see http://stackoverflow.com/a/5419388/3301902
+  std::stringstream out, err;
+  std::streambuf * oldout = std::cout.rdbuf(out.rdbuf());
+  std::streambuf * olderr = std::cerr.rdbuf(err.rdbuf());
+
+  bool success = true;
+
+  try {
     bob::core::log_level(bob::core::DEBUG);
     bob::core::debug << "This is a debug message" << std::endl;
     bob::core::info << "This is an info message" << std::endl;
     bob::core::warn << "This is a warning message" << std::endl;
     bob::core::error << "This is an error message" << std::endl;
+    success = success && out.str() == "This is a debug message\nThis is an info message\n";
+    success = success && err.str() == "This is a warning message\nThis is an error message\n";
 
+    out.str("");
+    err.str("");
     bob::core::log_level(bob::core::ERROR);
     bob::core::debug << "This is a debug message" << std::endl;
     bob::core::info << "This is an info message" << std::endl;
     bob::core::warn << "This is a warning message" << std::endl;
     bob::core::error << "This is an error message" << std::endl;
+    success = success && out.str() == "";
+    success = success && err.str() == "This is an error message\n";
 
+    out.str("");
+    err.str("");
     bob::core::log_level(bob::core::DISABLE);
     bob::core::debug << "This is a debug message" << std::endl;
     bob::core::info << "This is an info message" << std::endl;
     bob::core::warn << "This is a warning message" << std::endl;
     bob::core::error << "This is an error message" << std::endl;
+    success = success && out.str() == "";
+    success = success && err.str() == "";
+
+  } catch(...){
+    success = false;
+  }
+
+  // make sure that cout and cerr are redirected to their original streams
+  std::cout.rdbuf( oldout );
+  std::cerr.rdbuf( olderr );
 
   bob::core::log_level(bob::core::DEBUG);
 
-  Py_RETURN_NONE;
+  if (success)
+    Py_RETURN_TRUE;
+  else
+    Py_RETURN_FALSE;
 
 BOB_CATCH_FUNCTION("_test_output_disable", 0)
 }

bob/core/test_logging.py

@@ -77,102 +77,4 @@ def test_from_cxx_multithreaded():
 
 def test_from_cxx_disable():
   from bob.core._test import _test_output_disable
-  import sys, os
-  import threading
-
-  class OutputGrabber(object):
-      """
-      Class used to grab standard output or another stream.
-      This is a slight modification of what was proposed here:
-      http://stackoverflow.com/a/29834357/3301902
-      """
-      escape_char = "\b"
-
-      def __init__(self, stream=None, threaded=False):
-          self.origstream = stream
-          self.threaded = threaded
-          if self.origstream is None:
-              self.origstream = sys.stdout
-          self.origstreamfd = self.origstream.fileno()
-          self.capturedtext = ""
-          # Create a pipe so the stream can be captured:
-          self.pipe_out, self.pipe_in = os.pipe()
-
-      def start(self):
-          """
-          Start capturing the stream data.
-          """
-          self.capturedtext = ""
-          # Save a copy of the stream:
-          self.streamfd = os.dup(self.origstreamfd)
-          # Replace the Original stream with our write pipe
-          os.dup2(self.pipe_in, self.origstreamfd)
-          if self.threaded:
-              # Start thread that will read the stream:
-              self.workerThread = threading.Thread(target=self.readOutput)
-              self.workerThread.start()
-              # Make sure that the thread is running and os.read is executed:
-              time.sleep(0.01)
-
-      def stop(self):
-          """
-          Stop capturing the stream data and save the text in `capturedtext`.
-          """
-          # Flush the stream to make sure all our data goes in before
-          # the escape character.
-          self.origstream.flush()
-          # Print the escape character to make the readOutput method stop:
-          self.origstream.write(self.escape_char)
-          self.origstream.flush()
-          if self.threaded:
-              # wait until the thread finishes so we are sure that
-              # we have until the last character:
-              self.workerThread.join()
-          else:
-              self.readOutput()
-          # Close the pipe:
-          os.close(self.pipe_out)
-          # Restore the original stream:
-          os.dup2(self.streamfd, self.origstreamfd)
-
-      def readOutput(self):
-          """
-          Read the stream data (one byte at a time)
-          and save the text in `capturedtext`.
-          """
-          while True:
-              data = os.read(self.pipe_out, 1)  # Read One Byte Only
-              if self.escape_char in data:
-                  break
-              if not data:
-                  break
-              self.capturedtext += data
-
-
-  try:
-    # redirect output and error streams
-    out = OutputGrabber(sys.stdout)
-    err = OutputGrabber(sys.stderr)
-    out.start()
-    err.start()
-
-    # run our code
-    _test_output_disable()
-
-  finally:
-    # Clean up the pipe and restore the original stdout
-    out.stop()
-    err.stop()
-
-  # output should contain two lines
-  outs = out.capturedtext.rstrip().split("\n")
-  assert len(outs) == 2
-  assert outs[0] == "This is a debug message"
-  assert outs[1] == "This is an info message"
-
-  # error should contain three lines; error message is printed twice
-  errs = err.capturedtext.rstrip().split("\n")
-  assert len(errs) == 3
-  assert errs[0] == "This is a warning message"
-  assert errs[1] == "This is an error message"
-  assert errs[2] == "This is an error message"
+  assert _test_output_disable(), "The C++ test function returned false, indicating an (unknonw) error"