1 files changed, 58 insertions, 0 deletions
diff --git a/deps/npm/test/lib/npm.js b/deps/npm/test/lib/npm.js
index 566cbca20f..cd692a93f5 100644
--- a/deps/npm/test/lib/npm.js
+++ b/deps/npm/test/lib/npm.js
@@ -654,3 +654,61 @@ t.test('implicit workspace accept', async t => {
   })
   await t.rejects(mock.npm.exec('org', []), /.*Usage/)
 })
+
+t.test('usage', async t => {
+  const { npm } = await loadMockNpm(t)
+  t.afterEach(() => {
+    npm.config.set('viewer', null)
+    npm.config.set('long', false)
+    npm.config.set('userconfig', '/some/config/file/.npmrc')
+  })
+  const { dirname } = require('path')
+  const basedir = dirname(dirname(__dirname))
+  t.cleanSnapshot = str => str.split(basedir).join('{BASEDIR}')
+    .split(require('../../package.json').version).join('{VERSION}')
+
+  npm.config.set('viewer', null)
+  npm.config.set('long', false)
+  npm.config.set('userconfig', '/some/config/file/.npmrc')
+
+  t.test('basic usage', async t => {
+    t.matchSnapshot(await npm.usage)
+    t.end()
+  })
+
+  t.test('with browser', async t => {
+    npm.config.set('viewer', 'browser')
+    t.matchSnapshot(await npm.usage)
+    t.end()
+  })
+
+  t.test('with long', async t => {
+    npm.config.set('long', true)
+    t.matchSnapshot(await npm.usage)
+    t.end()
+  })
+
+  t.test('set process.stdout.columns', async t => {
+    const { columns } = process.stdout
+    t.teardown(() => {
+      Object.defineProperty(process.stdout, 'columns', {
+        value: columns,
+        enumerable: true,
+        configurable: true,
+        writable: true,
+      })
+    })
+    const cases = [0, 90]
+    for (const cols of cases) {
+      t.test(`columns=${cols}`, async t => {
+        Object.defineProperty(process.stdout, 'columns', {
+          value: cols,
+          enumerable: true,
+          configurable: true,
+          writable: true,
+        })
+        t.matchSnapshot(await npm.usage)
+      })
+    }
+  })
+})