Fix code coverage

[kayjan]

Description

Testing

Additional notes

Checklist

I have read through the contributing guidelines and ensured that

• I have added a descriptive title for this pull request.
• I have followed the convention and standards, and my code is checked for style and correctness.
• I have added test cases, and unit tests pass with 100% code coverage.
• I have updated the documentation and code docstrings.

Checklist (for reviewer)

• I have added label (breaking / enhancement / bug / documentation) to this pull request, if applicable.
• I will ensure this change is captured in the CHANGELOG.md file.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
bigtree	100%	100%	0	✔
bigtree.binarytree	100%	100%	0	✔
bigtree.dag	100%	100%	0	✔
bigtree.node	100%	100%	0	✔
bigtree.tree	100%	100%	0	✔
bigtree.tree.construct	100%	100%	0	✔
bigtree.tree.export	100%	100%	0	✔
bigtree.utils	100%	100%	0	✔
Summary	100% (3251 / 3251)	100% (1116 / 1116)	0	✔

[github-actions]

Benchmark

Details

Benchmark suite	Current: 67baa1d	Previous: 32fe3b4	Ratio
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_10	18780.577126914504 iter/sec (stddev: 0.000005948747928586803)	19156.996374591137 iter/sec (stddev: 0.0000030717425673265855)	1.02
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_100	537.6831614326826 iter/sec (stddev: 0.00009499732117803007)	403.17875809163155 iter/sec (stddev: 0.000017415050070588407)	0.75
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_1000	16.45320599418451 iter/sec (stddev: 0.00010882748129168816)	14.550872719002498 iter/sec (stddev: 0.00028899143020073793)	0.88
tests/node/test_node_benchmark.py::test_node_benchmark_width_2_depth_10	89.7596230562459 iter/sec (stddev: 0.0002716651220302374)	87.113119312428 iter/sec (stddev: 0.0003432364198132288)	0.97
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_10_no_assertions	25383.803102255984 iter/sec (stddev: 8.210923949257408e-7)	27094.176647908494 iter/sec (stddev: 0.0000039961432627389305)	1.07
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_100_no_assertions	1972.2893348387931 iter/sec (stddev: 0.00005209100093578454)	1884.9484042507154 iter/sec (stddev: 0.0000184389406900552)	0.96
tests/node/test_node_benchmark.py::test_node_benchmark_width_1_depth_1000_no_assertions	105.86895958364362 iter/sec (stddev: 0.00597703594767856)	100.60801498077053 iter/sec (stddev: 0.005875461614196878)	0.95
tests/node/test_node_benchmark.py::test_node_benchmark_width_2_depth_10_no_assertions	124.84526755566229 iter/sec (stddev: 0.00005008783813315881)	131.38817951133652 iter/sec (stddev: 0.00016246775318311114)	1.05

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