Added tests for IPython.config.application.Application

IPython/config/application.py

@@ -24,7 +24,7 b' import sys'
 
 from IPython.config.configurable import SingletonConfigurable
 from IPython.utils.traitlets import (
-    Unicode, List, Int
+    Unicode, List, Int, Enum
 )
 from IPython.config.loader import (
     KeyValueConfigLoader, PyFileConfigLoader
@@ -52,7 +52,10 b' class Application(SingletonConfigurable):'
     # The version string of this application.
     version = Unicode(u'0.0')
 
-    log_level = Int(logging.WARN, config=True, shortname="log_level")
+    # The log level for the application
+    log_level = Enum((0,10,20,30,40,50), default_value=logging.WARN,
+                     config=True, shortname="log_level",
+                     help="Set the log level (0,10,20,30,40,50).")
 
     def __init__(self, **kwargs):
         SingletonConfigurable.__init__(self, **kwargs)
@@ -105,8 +108,7 b' class Application(SingletonConfigurable):'
 
     def parse_command_line(self, argv=None):
         """Parse the command line arguments."""
-        if argv is None:
-            argv = sys.argv[1:]
+        argv = sys.argv[1:] if argv is None else argv
 
         if '-h' in argv or '--h' in argv:
             self.print_description()

docs/examples/core/appconfig.py

@@ -1,3 +1,14 b''
+"""A simple example of how to use IPython.config.application.Application.
+
+This should serve as a simple example that shows how the IPython config
+system works. The main classes are:
+
+* IPython.config.configurable.Configurable
+* IPython.config.configurable.SingletonConfigurable
+* IPython.config.loader.Config
+* IPython.config.application.Application
+"""
+
 import sys
 
 from IPython.config.configurable import Configurable
@@ -15,15 +26,24 b' class Foo(Configurable):'
 
 class Bar(Configurable):
 
-    enabled = Bool(True, config=True, shortname="bar-enabled", help="Enable bar.")
+    enabled = Bool(True, config=True, shortname="enabled", help="Enable bar.")
 
 
 class MyApp(Application):
 
     app_name = Unicode(u'myapp')
-    running = Bool(False, config=True, shortname="running", help="Is the app running?")
+    running = Bool(False, config=True, shortname="running",
+                   help="Is the app running?")
     classes = List([Bar, Foo])
-    config_file = Unicode(u'', config=True, shortname="config-file", help="Load this config file")
+    config_file = Unicode(u'', config=True, shortname="config_file",
+                   help="Load this config file")
+
+    def init_foo(self):
+        self.foo = Foo(config=self.config)
+
+    def init_bar(self):
+        self.bar = Bar(config=self.config)
+
 
 
 def main():
@@ -31,6 +51,8 b' def main():'
     app.parse_command_line()
     if app.config_file:
         app.load_config_file(app.config_file)
+    app.init_foo()
+    app.init_bar()
     print "app.config:"
     print app.config