Add integration TCs on bing search (#8068) (#10021)

## Description
Added integration TCs on bing search utility

## Issue
#8068 

## Dependencies
None

libs/langchain/tests/integration_tests/utilities/test_bing_search.py

@@ -0,0 +1,19 @@
+"""Integration test for Bing Search API Wrapper."""
+from langchain.utilities.bing_search import BingSearchAPIWrapper
+
+
+def test_call() -> None:
+    """Test that call gives the correct answer."""
+    search = BingSearchAPIWrapper()
+    output = search.run("Obama's first name")
+    assert "Barack Hussein Obama" in output
+
+
+def test_results() -> None:
+    """Test that call gives the correct answer."""
+    search = BingSearchAPIWrapper()
+    results = search.results("Obama's first name", num_results=5)
+    result_contents = "\n".join(
+        f"{result['title']}: {result['snippet']}" for result in results
+    )
+    assert "Barack Hussein Obama" in result_contents