Updated the test system

test/CSVToJSON.test.js

@@ -0,0 +1,18 @@
+const expect = require('expect');
+const {CSVToJSON} = require('./_30s.js');
+
+test('CSVToJSON is a Function', () => {
+  expect(CSVToJSON).toBeInstanceOf(Function);
+});
+test('CSVToJSON works with default delimiter', () => {
+  expect(CSVToJSON('col1,col2\na,b\nc,d')).toEqual([
+    { col1: 'a', col2: 'b' },
+    { col1: 'c', col2: 'd' }
+  ]);
+});
+test('CSVToJSON works with custom delimiter', () => {
+  expect(CSVToJSON('col1;col2\na;b\nc;d', ';')).toEqual([
+    { col1: 'a', col2: 'b' },
+    { col1: 'c', col2: 'd' }
+  ]);
+});