Disallow all ambiguous boolean values for Boolean

In release 1.1, the :class:`.Boolean` type was broken in that
boolean coercion via ``bool()`` would occur for backends that did not
feature "native boolean", but would not occur for native boolean backends,
meaning the string ``"0"`` now behaved inconsistently. After a poll, a
consensus was reached that non-boolean values should be raising an error,
especially in the ambiguous case of string ``"0"``; so the :class:`.Boolean`
datatype will now raise ``ValueError`` if an incoming value is not
within the range ``None, True, False, 1, 0``.

Change-Id: If70c4f79c266f0dd1a0306c0ffe7acb9c66c4cc3
Fixes: #4102

1 files changed, 0 insertions, 37 deletions

diff --git a/test/engine/test_processors.py b/test/engine/test_processors.py
index 83b5a7948..9f0055e05 100644
--- a/test/engine/test_processors.py
+++ b/test/engine/test_processors.py
@@ -34,43 +34,6 @@ class _BooleanProcessorTest(fixtures.TestBase):
         )
 
 
-class PyBooleanProcessorTest(_BooleanProcessorTest):
-    @classmethod
-    def setup_class(cls):
-        from sqlalchemy import processors
-        cls.module = type(
-            "util", (object,),
-            dict(
-                (k, staticmethod(v))
-                for k, v in list(processors.py_fallback().items())
-            )
-        )
-
-    def test_bool_to_int_false(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(False), 0)
-
-    def test_bool_to_int_true(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(True), 1)
-
-    def test_bool_to_int_positive_int(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(5), 1)
-
-    def test_bool_to_int_negative_int(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(-10), 1)
-
-    def test_bool_to_int_zero(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(0), 0)
-
-    def test_bool_to_int_one(self):
-        from sqlalchemy import processors
-        eq_(processors.boolean_to_int(1), 1)
-
-
 class CBooleanProcessorTest(_BooleanProcessorTest):
     __requires__ = ('cextensions',)