test: update sample execution

test/samples.coffee

@@ -1,15 +1,19 @@
 
 fs = require('fs').promises
-util = require 'util'
 path = require 'path'
 {exec} = require 'child_process'
-each = require 'each'
-
-it 'samples', -> 
+
+# `describe` label doesnt print because the code inside calling `it` is asynchronous.
+# From Mocha.js doc
+# https://mochajs.org/#dynamically-generating-tests
+# With top-level await you can collect your test data in a dynamic and asynchronous way while the test file is being loaded
+
+describe 'Samples', ->
+
   dir = path.resolve __dirname, '../samples'
   samples = await fs.readdir dir
-  return each samples.filter( (sample) -> /\.js$/.test sample)
-    .call (sample, callback) ->
+  for sample in samples
+    continue unless /\.js$/.test sample
+    it "Sample #{sample}", (callback) -> 
       exec "node #{path.resolve dir, sample}", (err) ->
         callback err
-    .promise()