test(searches): cover null input cases in IterativeBinarySearch

[nickzerjeski]

Description

Add regression tests for null safety behavior in IterativeBinarySearch.

The implementation already guards against null/empty inputs; this PR adds explicit unit coverage to prevent regressions.

Fixes #7330

Changes

• Added testBinarySearchNullArray
• Added testBinarySearchNullKey

Validation

• mvn -q -Dtest=IterativeBinarySearchTest test

[Copilot]

Pull request overview

Adds missing regression coverage for IterativeBinarySearch’s existing null-safety behavior (returning -1 for null array and null key), aligning the unit suite with the implementation’s guard clauses and preventing future regressions.

Changes:

• Added a unit test asserting find(null, key) returns -1.
• Added a unit test asserting find(array, null) returns -1.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.50%. Comparing base (df8fd85) to head (4463213).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7375   +/-   ##
=========================================
  Coverage     79.49%   79.50%           
- Complexity     7159     7161    +2     
=========================================
  Files           797      797           
  Lines         23409    23409           
  Branches       4603     4603           
=========================================
+ Hits          18609    18611    +2     
+ Misses         4054     4053    -1     
+ Partials        746      745    -1     

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