Added printing requirements

zope/schema/tests/test_interfaces.py

@@ -0,0 +1,99 @@
+import unittest
+
+
+class Test__is_field(unittest.TestCase):
+
+    def _callFUT(self, value):
+        from zope.schema.interfaces import _is_field
+        return _is_field(value)
+
+    def test_non_fields(self):
+        from zope.schema._compat import b
+        from zope.schema._compat import u
+        self.assertEqual(self._callFUT(None), False)
+        self.assertEqual(self._callFUT(0), False)
+        self.assertEqual(self._callFUT(0.0), False)
+        self.assertEqual(self._callFUT(True), False)
+        self.assertEqual(self._callFUT(b('')), False)
+        self.assertEqual(self._callFUT(u('')), False)
+        self.assertEqual(self._callFUT(()), False)
+        self.assertEqual(self._callFUT([]), False)
+        self.assertEqual(self._callFUT({}), False)
+        self.assertEqual(self._callFUT(set()), False)
+        self.assertEqual(self._callFUT(frozenset()), False)
+        self.assertEqual(self._callFUT(object()), False)
+
+    def test_w_normal_fields(self):
+        from zope.schema import Text
+        from zope.schema import Bytes
+        from zope.schema import Int
+        from zope.schema import Float
+        from zope.schema import Decimal
+        self.assertEqual(self._callFUT(Text()), True)
+        self.assertEqual(self._callFUT(Bytes()), True)
+        self.assertEqual(self._callFUT(Int()), True)
+        self.assertEqual(self._callFUT(Float()), True)
+        self.assertEqual(self._callFUT(Decimal()), True)
+
+    def test_w_explicitly_provided(self):
+        from zope.interface import directlyProvides
+        from zope.schema.interfaces import IField
+
+        class Foo(object):
+            pass
+
+        foo = Foo()
+        self.assertEqual(self._callFUT(foo), False)
+        directlyProvides(foo, IField)
+        self.assertEqual(self._callFUT(foo), True)
+
+
+class Test__fields(unittest.TestCase):
+
+    def _callFUT(self, values):
+        from zope.schema.interfaces import _fields
+        return _fields(values)
+
+    def test_empty_containers(self):
+        self.assertEqual(self._callFUT(()), True)
+        self.assertEqual(self._callFUT([]), True)
+
+    def test_w_non_fields(self):
+        self.assertEqual(self._callFUT([None]), False)
+        self.assertEqual(self._callFUT(['']), False)
+        self.assertEqual(self._callFUT([object()]), False)
+
+    def test_w_fields(self):
+        from zope.schema import Text
+        from zope.schema import Bytes
+        from zope.schema import Int
+        from zope.schema import Float
+        from zope.schema import Decimal
+        self.assertEqual(self._callFUT([Text()]), True)
+        self.assertEqual(self._callFUT([Bytes()]), True)
+        self.assertEqual(self._callFUT([Int()]), True)
+        self.assertEqual(self._callFUT([Float()]), True)
+        self.assertEqual(self._callFUT([Decimal()]), True)
+        self.assertEqual(
+            self._callFUT([Text(), Bytes(), Int(), Float(), Decimal()]),
+            True
+        )
+
+    def test_w_mixed(self):
+        from zope.schema import Text
+        from zope.schema import Bytes
+        from zope.schema import Int
+        from zope.schema import Float
+        from zope.schema import Decimal
+        self.assertEqual(self._callFUT([Text(), 0]), False)
+        self.assertEqual(
+            self._callFUT([Text(), Bytes(), Int(), Float(), Decimal(), 0]),
+            False
+        )
+
+
+def test_suite():
+    return unittest.TestSuite((
+        unittest.makeSuite(Test__is_field),
+        unittest.makeSuite(Test__fields),
+    ))