Support for mutable and immutable configurations

tests/ini/test_ini.py

@@ -14,6 +14,7 @@
 
 from src.config_parser.ini import INIConfiguration, INIConfigurationSection
 from src.config_parser.exceptions import INISyntaxError
+from src.config_parser import set_mutability
 
 def test_generating():
     config = INIConfiguration()
@@ -71,4 +72,26 @@ l2=w2''')
     assert dict(INIConfiguration.from_string('''[section1]
 k1=v1
 k2=v2
-k4=v4''', default = default_configuration)) == {'section1': {'k1': 'v1', 'k2': 'v2', 'k3': 'v3', 'k4': 'v4'}, 'section2': {'l1': 'w1', 'l2': 'w2'}}
+k4=v4''', default = default_configuration)) == {'section1': {'k1': 'v1', 'k2': 'v2', 'k3': 'v3', 'k4': 'v4'}, 'section2': {'l1': 'w1', 'l2': 'w2'}}
+
+def test_mutability():
+    config = INIConfiguration(mutable=False)
+    try:
+        config.key = 'value'
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass
+
+    set_mutability(config, True)
+    assert config._mutable == True
+
+    config.key = 'value'
+
+    set_mutability(config, False)
+    assert config._mutable == False
+
+    try:
+        del config.key
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass