Fixed ``instrument_declarative`` registry call.

Fixed :func:`_declarative.instrument_declarative` that called
a non existing registry method.

Fixes: #6291
Change-Id: I6fc8db84f72240cc82e7f6f3a784c424f5ccfc96

1 files changed, 25 insertions, 0 deletions

diff --git a/test/ext/declarative/test_deprecations.py b/test/ext/declarative/test_deprecations.py
new file mode 100644
index 000000000..f2055541a
--- /dev/null
+++ b/test/ext/declarative/test_deprecations.py
@@ -0,0 +1,25 @@
+import sqlalchemy as sa
+from sqlalchemy.ext.declarative import instrument_declarative
+from sqlalchemy.orm import Mapper
+from sqlalchemy.testing import expect_deprecated_20
+from sqlalchemy.testing import fixtures
+from sqlalchemy.testing import is_
+from sqlalchemy.testing import is_true
+
+
+class TestInstrumentDeclarative(fixtures.TestBase):
+    def test_ok(self):
+        class Foo(object):
+            __tablename__ = "foo"
+            id = sa.Column(sa.Integer, primary_key=True)
+
+        meta = sa.MetaData()
+        reg = {}
+        with expect_deprecated_20(
+            "the instrument_declarative function is deprecated"
+        ):
+            instrument_declarative(Foo, reg, meta)
+
+        mapper = sa.inspect(Foo)
+        is_true(isinstance(mapper, Mapper))
+        is_(mapper.class_, Foo)