ran npm run tdd & generated TDD

test/symmetricDifference/symmetricDifference.js

@@ -0,0 +1,5 @@
+module.exports = (a, b) => {
+const sA = new Set(a),
+sB = new Set(b);
+return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];
+};

test/symmetricDifference/symmetricDifference.test.js

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+const test = require('tape');
+const symmetricDifference = require('./symmetricDifference.js');
+
+test('Testing symmetricDifference', (t) => {
+	//For more information on all the methods supported by tape
+	//Please go to https://github.com/substack/tape
+	t.true(typeof symmetricDifference === 'function', 'symmetricDifference is a Function');
+	//t.deepEqual(symmetricDifference(args..), 'Expected');
+	//t.equal(symmetricDifference(args..), 'Expected');
+	//t.false(symmetricDifference(args..), 'Expected');
+	//t.throws(symmetricDifference(args..), 'Expected');
+	t.end();
+});