add testcase for anywidget buttons

Author: shuoweil

tests/system/small/test_anywidget.py

@@ -0,0 +1,122 @@
+# Copyright 2025 Google LLC
+#
+# 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 math
+
+import pytest
+
+import bigframes as bf
+
+
+def test_repr_anywidget_initial_state(
+    penguins_df_default_index: bf.dataframe.DataFrame,
+):
+    pytest.importorskip("anywidget")
+    with bf.option_context("display.repr_mode", "anywidget"):
+        from bigframes.display import TableWidget
+
+        widget = TableWidget(penguins_df_default_index)
+        assert widget.page == 0
+        assert widget.page_size == bf.options.display.max_rows
+        assert widget.row_count > 0
+
+
+def test_repr_anywidget_pagination_navigation(
+    penguins_df_default_index: bf.dataframe.DataFrame,
+):
+    """Test basic prev/next navigation functionality."""
+    pytest.importorskip("anywidget")
+    with bf.option_context("display.repr_mode", "anywidget"):
+        from bigframes.display.anywidget import TableWidget
+
+        widget = TableWidget(penguins_df_default_index)
+
+        # Test initial state
+        assert widget.page == 0
+
+        # Simulate next page click
+        widget.page = 1
+        assert widget.page == 1
+
+        # Simulate prev page click
+        widget.page = 0
+        assert widget.page == 0
+
+
+def test_repr_anywidget_pagination_edge_cases(
+    penguins_df_default_index: bf.dataframe.DataFrame,
+):
+    """Test pagination at boundaries."""
+    pytest.importorskip("anywidget")
+    with bf.option_context("display.repr_mode", "anywidget"):
+        from bigframes.display.anywidget import TableWidget
+
+        widget = TableWidget(penguins_df_default_index)
+
+        # Test going below page 0
+        widget.page = -1
+        # Should stay at 0 (handled by frontend)
+
+        # Test going beyond last page
+        total_pages = math.ceil(widget.row_count / widget.page_size)
+        widget.page = total_pages + 1
+        # Should be clamped to last valid page
+
+
+def test_repr_anywidget_pagination_different_page_sizes(
+    penguins_df_default_index: bf.dataframe.DataFrame,
+):
+    """Test pagination with different page sizes."""
+    pytest.importorskip("anywidget")
+
+    # Test with smaller page size
+    with bf.option_context("display.repr_mode", "anywidget", "display.max_rows", 5):
+        from bigframes.display.anywidget import TableWidget
+
+        widget = TableWidget(penguins_df_default_index)
+
+        assert widget.page_size == 5
+        total_pages = math.ceil(widget.row_count / 5)
+        assert total_pages > 1  # Should have multiple pages
+
+        # Navigate through several pages
+        for page in range(min(3, total_pages)):
+            widget.page = page
+            assert widget.page == page
+
+
+def test_repr_anywidget_pagination_buttons_functionality(
+    penguins_df_default_index: bf.dataframe.DataFrame,
+):
+    """Test complete pagination button functionality."""
+    pytest.importorskip("anywidget")
+    with bf.option_context("display.repr_mode", "anywidget", "display.max_rows", 10):
+        from bigframes.display.anywidget import TableWidget
+
+        widget = TableWidget(penguins_df_default_index)
+
+        # Test initial state
+        assert widget.page == 0
+        assert widget.page_size == 10
+        assert widget.row_count > 0
+
+        # Calculate expected pages
+        total_pages = math.ceil(widget.row_count / widget.page_size)
+
+        # Test navigation through all pages
+        for page_num in range(min(total_pages, 5)):  # Test first 5 pages
+            widget.page = page_num
+            assert widget.page == page_num
+            # Verify table_html is updated
+            assert len(widget.table_html) > 0