diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..44ab445
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,210 @@
+# pylint: disable=redefined-outer-name,missing-function-docstring,protected-access,global-statement
+""" Tests on config lib """
+
+from mylib.config import Config, ConfigSection
+from mylib.config import StringOption
+
+runned = dict()
+
+
+def test_config_init_default_args():
+    appname = 'Test app'
+    config = Config(appname)
+    assert config.appname == appname
+    assert config.version == '0.0'
+    assert config.encoding == 'utf-8'
+
+
+def test_config_init_custom_args():
+    appname = 'Test app'
+    version = '1.43'
+    encoding = 'ISO-8859-1'
+    config = Config(appname, version=version, encoding=encoding)
+    assert config.appname == appname
+    assert config.version == version
+    assert config.encoding == encoding
+
+
+def test_add_section_default_args():
+    config = Config('Test app')
+    name = 'test_section'
+    section = config.add_section(name)
+    assert isinstance(section, ConfigSection)
+    assert config.sections[name] == section
+    assert section.name == name
+    assert section.comment is None
+    assert section.order == 10
+
+
+def test_add_section_custom_args():
+    config = Config('Test app')
+    name = 'test_section'
+    comment = 'Test'
+    order = 20
+    section = config.add_section(name, comment=comment, order=order)
+    assert isinstance(section, ConfigSection)
+    assert section.name == name
+    assert section.comment == comment
+    assert section.order == order
+
+
+def test_add_section_with_callback():
+    config = Config('Test app')
+    name = 'test_section'
+
+    global runned
+    runned['test_add_section_with_callback'] = False
+
+    def test_callback(loaded_config):
+        global runned
+        assert loaded_config == config
+        assert runned['test_add_section_with_callback'] is False
+        runned['test_add_section_with_callback'] = True
+
+    section = config.add_section(name, loaded_callback=test_callback)
+    assert isinstance(section, ConfigSection)
+    assert test_callback in config._loaded_callbacks
+    assert runned['test_add_section_with_callback'] is False
+
+    config.parse_arguments_options(argv=[], create=False)
+    assert runned['test_add_section_with_callback'] is True
+    assert test_callback in config._loaded_callbacks_executed
+    # Try to execute again to verify callback is not runned again
+    config._loaded()
+
+
+def test_add_section_with_callback_already_loaded():
+    config = Config('Test app')
+    name = 'test_section'
+    config.parse_arguments_options(argv=[], create=False)
+
+    global runned
+    runned['test_add_section_with_callback_already_loaded'] = False
+
+    def test_callback(loaded_config):
+        global runned
+        assert loaded_config == config
+        assert runned['test_add_section_with_callback_already_loaded'] is False
+        runned['test_add_section_with_callback_already_loaded'] = True
+
+    section = config.add_section(name, loaded_callback=test_callback)
+    assert isinstance(section, ConfigSection)
+    assert runned['test_add_section_with_callback_already_loaded'] is True
+    assert test_callback in config._loaded_callbacks
+    assert test_callback in config._loaded_callbacks_executed
+    # Try to execute again to verify callback is not runned again
+    config._loaded()
+
+
+def test_add_option_default_args():
+    config = Config('Test app')
+    section = config.add_section('my_section')
+    assert isinstance(section, ConfigSection)
+    name = 'my_option'
+    option = section.add_option(StringOption, name)
+    assert isinstance(option, StringOption)
+    assert name in section.options and section.options[name] == option
+    assert option.config == config
+    assert option.section == section
+    assert option.name == name
+    assert option.default is None
+    assert option.comment is None
+    assert option.no_arg is False
+    assert option.arg is None
+    assert option.short_arg is None
+    assert option.arg_help is None
+
+
+def test_add_option_custom_args():
+    config = Config('Test app')
+    section = config.add_section('my_section')
+    assert isinstance(section, ConfigSection)
+    name = 'my_option'
+    kwargs = dict(
+        default='default value',
+        comment='my comment',
+        no_arg=True,
+        arg='--my-option',
+        short_arg='-M',
+        arg_help='My help'
+    )
+    option = section.add_option(StringOption, name, **kwargs)
+    assert isinstance(option, StringOption)
+    assert name in section.options and section.options[name] == option
+
+    assert option.config == config
+    assert option.section == section
+    assert option.name == name
+    for arg, value in kwargs.items():
+        assert getattr(option, arg) == value
+
+
+def test_defined():
+    config = Config('Test app')
+    section_name = 'my_section'
+    opt_name = 'my_option'
+    assert not config.defined(section_name, opt_name)
+
+    section = config.add_section('my_section')
+    assert isinstance(section, ConfigSection)
+    section.add_option(StringOption, opt_name)
+
+    assert config.defined(section_name, opt_name)
+
+
+def test_isset():
+    config = Config('Test app')
+    section_name = 'my_section'
+    opt_name = 'my_option'
+    assert not config.isset(section_name, opt_name)
+
+    section = config.add_section('my_section')
+    assert isinstance(section, ConfigSection)
+    option = section.add_option(StringOption, opt_name)
+
+    assert not config.isset(section_name, opt_name)
+
+    config.parse_arguments_options(argv=[option.parser_argument_name, 'value'], create=False)
+
+    assert config.isset(section_name, opt_name)
+
+
+def test_not_isset():
+    config = Config('Test app')
+    section_name = 'my_section'
+    opt_name = 'my_option'
+    assert not config.isset(section_name, opt_name)
+
+    section = config.add_section('my_section')
+    assert isinstance(section, ConfigSection)
+    option = section.add_option(StringOption, opt_name)
+
+    assert not config.isset(section_name, opt_name)
+
+    config.parse_arguments_options(argv=[], create=False)
+
+    assert not config.isset(section_name, opt_name)
+
+
+def test_get():
+    config = Config('Test app')
+    section_name = 'my_section'
+    opt_name = 'my_option'
+    opt_value = 'value'
+    section = config.add_section('my_section')
+    option = section.add_option(StringOption, opt_name)
+    config.parse_arguments_options(argv=[option.parser_argument_name, opt_value], create=False)
+
+    assert config.get(section_name, opt_name) == opt_value
+
+
+def test_get_default():
+    config = Config('Test app')
+    section_name = 'my_section'
+    opt_name = 'my_option'
+    opt_default_value = 'value'
+    section = config.add_section('my_section')
+    option = section.add_option(StringOption, opt_name, default=opt_default_value)
+    config.parse_arguments_options(argv=[], create=False)
+
+    assert config.get(section_name, opt_name) == opt_default_value