test(backends): remove now unused supports_floating_modulus backend flag (ibis-project#8939)

Test case configuration now happens through pytest markers.

depends on ibis-project#8937

---------

Co-authored-by: Gil Forsyth <gforsyth@users.noreply.github.com>

Author: kszucs

docs/contribute/05_reference.qmd

@@ -18,7 +18,6 @@ from ibis.backends.tests.base import BackendTest
 class TestConf(BackendTest):
     """Backend-specific class with information for testing."""
 
-    supports_floating_modulus = False
     returned_timestamp_unit = "us"
     supports_structs = True
     supports_json = True

ibis/backends/bigquery/tests/conftest.py

@@ -21,7 +21,6 @@
 class TestConf(BackendTest):
     """Backend-specific class with information for testing."""
 
-    supports_floating_modulus = False
     returned_timestamp_unit = "us"
     supports_structs = True
     supports_json = True

ibis/backends/clickhouse/tests/conftest.py

@@ -26,7 +26,6 @@ class TestConf(ServiceBackendTest):
     check_dtype = False
     returned_timestamp_unit = "s"
     supported_to_timestamp_units = {"s"}
-    supports_floating_modulus = False
     supports_json = False
     force_sort = True
     rounding_method = "half_to_even"

ibis/backends/exasol/tests/conftest.py

@@ -29,7 +29,6 @@ class TestConf(ServiceBackendTest):
     supports_arrays = False
     returned_timestamp_unit = "us"
     supported_to_timestamp_units = {"s", "ms", "us"}
-    supports_floating_modulus = True
     native_bool = True
     supports_structs = False
     supports_json = False

ibis/backends/tests/base.py

@@ -38,8 +38,6 @@ class BackendTest(abc.ABC):
     "Whether backend supports Arrays / Lists"
     returned_timestamp_unit: str = "us"
     supported_to_timestamp_units = {"s", "ms", "us"}
-    supports_floating_modulus: bool = True
-    "Whether backend supports floating point in modulus operations"
     native_bool: bool = True
     "Whether backend has native boolean types"
     supports_structs: bool = True