Add unhandled exception tests (#682)

Adds unhandled exception tests #654
Fixes a bug in _io.py that caused JSONDecodeError in tests sometimes #683
Fixes a issue for some cases where the tests were timing out on windows

ptvsd/wrapper.py

@@ -653,6 +653,7 @@ class InternalsFilter(object):
     """Identifies debugger internal artifacts.
     """
     # TODO: Move the internal thread identifier here
+
     def __init__(self):
         if platform.system() == 'Windows':
             self._init_windows()
@@ -1407,6 +1408,7 @@ def _apply_code_stepping_settings(self):
                                 '\t'.join(project_dirs))
 
     def _is_stdlib(self, filepath):
+        filepath = os.path.normcase(os.path.normpath(filepath))
         for prefix in STDLIB_PATH_PREFIXES:
             if prefix != '' and filepath.startswith(prefix):
                 return True
@@ -2090,7 +2092,7 @@ def on_setBreakpoints(self, request, args):
                 condition = None
                 expressions = re.findall('\{.*?\}', logMessage)
                 if len(expressions) == 0:
-                    expression = '{}'.format(repr(logMessage)) # noqa
+                    expression = '{}'.format(repr(logMessage))  # noqa
                 else:
                     raw_text = reduce(lambda a, b: a.replace(b, '{}'), expressions, logMessage) # noqa
                     raw_text = raw_text.replace('"', '\\"')

tests/helpers/_io.py

@@ -103,6 +103,9 @@ def iter_lines_buffered(read, sep=b'\n', initial=b'', stop=noop):
                 data = read(1024)
                 if not data:
                     raise EOFError()
+                if buf and buf[-1:] == b'\r':
+                    data = buf + data
+                    buf = b''
             except EOFError as exc:
                 exc.remainder = buf
                 raise

tests/resources/system_tests/test_exceptions/mypkg_attach_unhandled/__main__.py

@@ -0,0 +1,7 @@
+import ptvsd
+import sys
+ptvsd.enable_attach((sys.argv[1], sys.argv[2]))
+ptvsd.wait_for_attach()
+
+raise ArithmeticError('Hello')
+sys.stdout.write('end')

tests/resources/system_tests/test_exceptions/mypkg_launch_unhandled/__main__.py

@@ -0,0 +1,4 @@
+import sys
+
+raise ArithmeticError('Hello')
+sys.stdout.write('end')

tests/resources/system_tests/test_exceptions/unhandled_exceptions_attach.py

@@ -0,0 +1,7 @@
+import sys
+import ptvsd
+ptvsd.enable_attach((('localhost', 9879)))
+ptvsd.wait_for_attach()
+
+raise ArithmeticError('Hello')
+sys.stdout.write('end')