unit testing

Author: wangding

27-unit-test/app.js

@@ -0,0 +1,11 @@
+#!/bin/env node
+
+const add = require('./calc');
+
+if(process.argv.length != 4) {
+  console.log('Usage: cmd x y');
+  process.exit(1);
+}
+
+const [,,x, y] = process.argv;
+console.log(`${x} + ${y} = ${add(Number(x), Number(y))}`);

27-unit-test/calc.js

@@ -0,0 +1,9 @@
+function add(x, y) {
+  if (isNaN(x) || isNaN(y)) {
+    return  NaN;
+  } else {
+    return x+y;
+  }
+}
+
+module.exports = add;