Create lint.test.js

tests/commands/channels/lint.test.js

@@ -0,0 +1,19 @@
+const { execSync } = require('child_process')
+
+fit('will show a message if the file contains a syntax error', () => {
+  try {
+    const stdout = execSync(
+      'npm run channels:lint -- tests/__data__/input/sites/lint.channels.xml',
+      {
+        encoding: 'utf8'
+      }
+    )
+    console.log(stdout)
+    process.exit(1)
+  } catch (err) {
+    expect(err.status).toBe(1)
+    expect(err.stdout).toBe(
+      `\n> channels:lint\n> node scripts/commands/channels/lint.js "tests/__data__/input/sites/lint.channels.xml"\n\n\ntests/__data__/input/sites/lint.channels.xml\n 4:0  Element 'channel': The attribute 'lang' is required but missing.\n\n1 error(s)\n`
+    )
+  }
+})