Add regression test for assert_equal row-count mismatch

integration_tests/src/main/python/asserts_regression_test.py

@@ -0,0 +1,40 @@
+# Copyright (c) 2026, NVIDIA CORPORATION.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from asserts import assert_equal
+from spark_session import with_cpu_session, with_gpu_session
+
+
+def test_assert_equal_row_count_match():
+    cpu_count = with_cpu_session(lambda spark: spark.range(12).count())
+    gpu_count = with_gpu_session(lambda spark: spark.range(12).count())
+
+    assert_equal(cpu_count, gpu_count)
+
+
+def test_assert_equal_row_count_mismatch_raises_assertion_error(capsys):
+    cpu_count = with_cpu_session(lambda spark: spark.range(2).count())
+    gpu_count = with_gpu_session(lambda spark: spark.range(1).count())
+
+    with pytest.raises(AssertionError) as exc_info:
+        assert_equal(cpu_count, gpu_count)
+
+    assert "int values are different" in str(exc_info.value)
+    captured = capsys.readouterr()
+    assert "--- CPU OUTPUT" in captured.out
+    assert "+++ GPU OUTPUT" in captured.out
+    assert "-2" in captured.out
+    assert "+1" in captured.out