Testfix1

Checklist

• make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

test: test-dh-padding.js test-domain-abort-on-uncaught.js test-domain-crypto.js test-domain-enter-exit.js

Description of change

change the assert.equal into assert.strictEqual. and change the var into let/const for some variable.