Country enhancements

* Make Country validate itself during object initialization
* Make Country string coercible

CHANGES.rst

@@ -8,6 +8,8 @@ Here you can see the full list of changes between each SQLAlchemy-Utils release.
 ^^^^^^^^^^^^^^^^^^^^
 
 - Added __hash__ method to Country class
+- Made Country validate itself during object initialization
+- Made Country string coercible
 
 
 0.29.9 (2015-04-07)

sqlalchemy_utils/primitives/country.py

@@ -1,18 +1,37 @@
 import six
 from sqlalchemy_utils import i18n
+from sqlalchemy_utils.utils import str_coercible
 
 
+@str_coercible
 class Country(object):
     def __init__(self, code_or_country):
         if isinstance(code_or_country, Country):
             self.code = code_or_country.code
-        else:
+        elif isinstance(code_or_country, six.string_types):
+            self.validate(code_or_country)
             self.code = code_or_country
+        else:
+            raise TypeError(
+                "Country() argument must be a string or a country, not '{0}'"
+                .format(
+                    type(code_or_country).__name__
+                )
+            )
 
     @property
     def name(self):
         return i18n.get_locale().territories[self.code]
 
+    @classmethod
+    def validate(self, code):
+        try:
+            i18n.get_locale().territories[code]
+        except KeyError:
+            raise ValueError(
+                'Could not convert string to country code: {0}'.format(code)
+            )
+
     def __eq__(self, other):
         if isinstance(other, Country):
             return self.code == other.code

tests/primitives/test_country.py

@@ -1,18 +1,68 @@
-from sqlalchemy_utils import Country
+import six
+from pytest import mark, raises
+
+from sqlalchemy_utils import Country, i18n
+from sqlalchemy_utils.primitives.currency import babel  # noqa
 
 
+@mark.skipif('babel is None')
 class TestCountry(object):
+    def setup_method(self, method):
+        i18n.get_locale = lambda: babel.Locale('en')
+
     def test_init(self):
-        assert Country(u'fi') == Country(Country(u'fi'))
+        assert Country(u'FI') == Country(Country(u'FI'))
+
+    def test_constructor_with_wrong_type(self):
+        with raises(TypeError) as e:
+            Country(None)
+        assert str(e.value) == (
+            "Country() argument must be a string or a country, not 'NoneType'"
+        )
+
+    def test_constructor_with_invalid_code(self):
+        with raises(ValueError) as e:
+            Country('SomeUnknownCode')
+        assert str(e.value) == (
+            'Could not convert string to country code: SomeUnknownCode'
+        )
+
+    @mark.parametrize(
+        'code',
+        (
+            'FI',
+            'US',
+        )
+    )
+    def test_validate_with_valid_codes(self, code):
+        Country.validate(code)
+
+    def test_validate_with_invalid_code(self):
+        with raises(ValueError) as e:
+            Country.validate('SomeUnknownCode')
+        assert str(e.value) == (
+            'Could not convert string to country code: SomeUnknownCode'
+        )
 
     def test_equality_operator(self):
-        assert Country(u'fi') == u'fi'
-        assert u'fi' == Country(u'fi')
-        assert Country(u'fi') == Country(u'fi')
+        assert Country(u'FI') == u'FI'
+        assert u'FI' == Country(u'FI')
+        assert Country(u'FI') == Country(u'FI')
 
     def test_non_equality_operator(self):
-        assert Country(u'fi') != u'sv'
-        assert not (Country(u'fi') != u'fi')
+        assert Country(u'FI') != u'sv'
+        assert not (Country(u'FI') != u'FI')
 
     def test_hash(self):
-        return hash(Country('fi')) == hash('fi')
+        return hash(Country('FI')) == hash('FI')
+
+    def test_repr(self):
+        return repr(Country('FI')) == "Country('FI')"
+
+    def test_unicode(self):
+        country = Country('FI')
+        assert six.text_type(country) == u'Finland'
+
+    def test_str(self):
+        country = Country('FI')
+        assert str(country) == 'Finland'

tests/types/test_country.py

@@ -18,7 +18,7 @@ class TestCountryType(TestCase):
 
     def test_parameter_processing(self):
         user = self.User(
-            country=Country(u'fi')
+            country=Country(u'FI')
         )
 
         self.session.add(user)
@@ -28,6 +28,6 @@ class TestCountryType(TestCase):
         assert user.country.name == u'Finland'
 
     def test_scalar_attributes_get_coerced_to_objects(self):
-        user = self.User(country='fi')
+        user = self.User(country='FI')
 
         assert isinstance(user.country, Country)