test: update var to let/const and assert.equal to assert.strictEqual.
Checklist
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make -j8 test
(UNIX), orvcbuild test nosign
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
Test
Description of change
Updated variable declarations to const/let where possible. Updated assert.equal calls to assert.strictEqual where possible.