Dev: Add new tests for get-functions.js

[polemius]

- Summary

I've added the test for get-functions.js

- Test plan

Please, run the test get-functions.test.js

- Description for the changelog

New test for get-functions.js

[RaeesBhatti]

Cool. Thank you for the PR @polemius 🌸

[polemius]

I'm happy to help :)

[polemius]

Also I have a question:

cli/src/utils/get-functions.js

Line 10 in 564046d

if (dir === 'node_modules') {

Here should be the variable dir?
If yes, then I believe we can lift this if up, like this:

 getFunctions(dir) {
    const functions = {}
+   if (dir === 'node_modules') {
+      return
+   }
    if (fs.existsSync(dir)) {
      fs.readdirSync(dir).forEach(file => {
-       if (dir === 'node_modules') {
-         return
-       }
        const functionPath = path.resolve(path.join(dir, file))

if not, then if should check file variable:

 getFunctions(dir) {
    const functions = {}
    if (fs.existsSync(dir)) {
      fs.readdirSync(dir).forEach(file => {
-       if (dir === 'node_modules') {
+       if (file === 'node_modules') {
          return
        }
        const functionPath = path.resolve(path.join(dir, file))

@polemius Am I right?