tests: tests for root command

Author: nlf

test/lib/root.js

@@ -0,0 +1,19 @@
+const { test } = require('tap')
+const requireInject = require('require-inject')
+
+test('root', (t) => {
+  t.plan(3)
+  const dir = '/root/dir'
+
+  const root = requireInject('../../lib/root.js', {
+    '../../lib/npm.js': { dir },
+    '../../lib/utils/output.js': (output) => {
+      t.equal(output, dir, 'prints the correct directory')
+    }
+  })
+
+  root([], (err) => {
+    t.ifError(err, 'npm root')
+    t.ok('should have printed directory')
+  })
+})