test: Add unit tests for templateVarHandler to improve coverage

[MatheussBrant]

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Proposed Changes

This pull request introduces unit tests for the templateVarHandler function to improve test coverage and ensure correct behavior under different conditions.
Key Changes:

Created a dedicated test file for the templateVarHandler function in the directory:
tests/unit/app/utils/lib/templateVarHandler.spec.ts.
Added comprehensive unit tests to cover all logical branches and edge cases of the function.
Fixed coverage gaps, increasing coverage from:
    Statements: 41.66% → 100%
    Branch: 9.09% → 81.81%
    Functions: 100% → 100%
    Lines: 39.13% → 100%.

Screenshots (Coverage Changes):

Before:

After:

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[KevLehman]

What do you think of, instead of creating a new describe for each item, you construct an array of "test cases" and then you loop on them to do the test?

Something like:

const tests = [{ variable: 'attribute1', object: { attribute1: 'value1' }, expected: 'value1' }]

describe('templateVarHandler', () => {
tests.forEach((t) => { it(`should return ${t.expected} when ${t.variable} is passed as key`, () => { expect(templateVarHandler(t.variable, t.object)).to.be.equal(t.expected) }
})

(I may have missed some () but wdyt?

[KevLehman]

Hey, thanks for contribution!

Seems your linting settings are a bit off, as looks you're reducing the tabspace or you just have set your tab size too low. Wanna use eslint to fix those issues? You can run yarn lint on your local which will lint all the packages