Add warn_deprecated_limited feature

Fixes: #5268
Change-Id: I2f976048af4f8d6dd03a14efa31d179bd7324ba6

1 files changed, 36 insertions, 0 deletions

diff --git a/test/base/test_warnings.py b/test/base/test_warnings.py
new file mode 100644
index 000000000..c8807df09
--- /dev/null
+++ b/test/base/test_warnings.py
@@ -0,0 +1,36 @@
+from sqlalchemy.testing import eq_
+from sqlalchemy.testing import expect_deprecated
+from sqlalchemy.testing import fixtures
+from sqlalchemy.util.deprecations import warn_deprecated_limited
+from sqlalchemy.util.langhelpers import _hash_limit_string
+
+
+class WarnDeprecatedLimitedTest(fixtures.TestBase):
+    __backend__ = False
+
+    def test_warn_deprecated_limited_text(self):
+        with expect_deprecated("foo has been deprecated"):
+            warn_deprecated_limited(
+                "%s has been deprecated [%d]", ("foo", 1), "1.3"
+            )
+
+    def test_warn_deprecated_limited_cap(self):
+        """ warn_deprecated_limited() and warn_limited() use
+        _hash_limit_string
+
+        actually just verifying that _hash_limit_string works as expected
+        """
+        occurrences = 100
+        cap = 10
+
+        printouts = set()
+        messages = set()
+        for i in range(occurrences):
+            message = _hash_limit_string(
+                "this is a unique message: %d", cap, (i,)
+            )
+            printouts.add(str(message))
+            messages.add(message)
+
+        eq_(len(printouts), occurrences)
+        eq_(len(messages), cap)