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Create Several Feature Layers and add them to a MXD

I am trying to create several layer files and add them to a map document that I have already created. I attempted to use "CURRENT" for arcpy.mapping.MapDocument but I am getting an error that the map document cannot be opened. I am guessing that is because I am running this in IDLE rather than in the Python Window in ArcGIS.

The following is my code. Understandably, I have gone awry and was curious if anyone can send me in the right direction.

import arcpy, os

arcpy.env.workspace = r'C:\test.gbd'
fcs = arcpy.ListFeatureClasses()

mxd = arcpy.mapping.MapDocument('CURRENT')
DF = arcpy.mapping.ListDataFrames(mxd,'*')[0]

for feature in fcs:                
     arcpy.MakeFeatureLayer_management('C:\test.gdb', (How could I get the code to
     make several feature layers?))

layer = arcpy.mapping.Layer(mxd)
arcpy.mapping.AddLayer(DF,layer,"AUTO_ARRANGE")