Finish implementation for #3

kattcmd/core.py

+import ast
 import os
 import configparser
 
@@ -26,7 +27,7 @@ def TouchStructure():
         }
 
         with open(kattcmd_file, 'w') as configfile:
-            configfile.write(config)
+            config.write(configfile)
 
         return True
     return False
@@ -42,7 +43,11 @@ def _ListExternals():
     config_path = os.path.expanduser('~/.kattcmd')
     config = configparser.ConfigParser()
     config.read(config_path)
-    return config['options']['plugins']
+
+    # See https://stackoverflow.com/questions/1894269/convert-string-representation-of-list-to-list-in-python
+    # for why we use ast.literal_eval here
+    L = ast.literal_eval(config['options']['plugins'])
+    return [x.strip() for x in L if x.strip()]
 
 
 def ListPlugins():

test/test_core.py

 import os
+import tempfile
+import configparser
+
 from kattcmd import core
 
 
-def test_one_plus_one():
-    assert 1 + 1 == 2
+def with_custom_home(f):
+    '''Descriptor for tests that should run in their own isolated environment.'''
+    def inner(*args, **kwargs):
+        with tempfile.TemporaryDirectory() as tempdirname:
+            os.environ['HOME'] = tempdirname
+            f(*args, **kwargs)
+
+    return inner
+
+
+@with_custom_home
+def test_creates_kattcmd_options():
+    assert core.TouchStructure()
+
+    kattcmd_path = os.path.expanduser('~/.kattcmd')
+    assert os.path.isfile(kattcmd_path)
+
+    config = configparser.ConfigParser()
+    config.read(kattcmd_path)
+
+    assert 'options' in config
+    assert 'kattisrc' in config['options']
+    assert 'plugins' in config['options']
+
+
+@with_custom_home
+def test_touch_twice():
+    assert core.TouchStructure()
+    assert not core.TouchStructure()
+
+
+@with_custom_home
+def test_lists_plugins():
+    assert core.TouchStructure()
+    plugins = core.ListPlugins()
+    assert isinstance(plugins, list)
+