Test cases for check_bipartite_graph_bfs (#10688)

* [ADD] tests for check_bipartite_graph_bfs

* linter fix?

* linter fix

* [ADD] more test cases check_bipartite_graph_bfs

* doctest fixes. Forgot to add 'Traceback...'

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* missed a Traceback

* Update check_bipartite_graph_bfs.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>