1 files changed, 85 insertions, 0 deletions
diff --git a/test/lib/utils/display.js b/test/lib/utils/display.js
new file mode 100644
index 000000000..30cd2cc27
--- /dev/null
+++ b/test/lib/utils/display.js
@@ -0,0 +1,85 @@
+const t = require('tap')
+const log = require('../../../lib/utils/log-shim')
+const mockLogs = require('../../fixtures/mock-logs')
+const mockGlobals = require('../../fixtures/mock-globals')
+
+const mockDisplay = (t, mocks) => {
+  const { logs, logMocks } = mockLogs(mocks)
+  const Display = t.mock('../../../lib/utils/display', {
+    ...mocks,
+    ...logMocks,
+  })
+  const display = new Display()
+  t.teardown(() => display.off())
+  return { display, logs }
+}
+
+t.test('setup', async (t) => {
+  const { display } = mockDisplay(t)
+
+  display.load({ timing: true, loglevel: 'notice' })
+  t.equal(log.level, 'timing')
+
+  display.load({ timing: false, loglevel: 'notice' })
+  t.equal(log.level, 'notice')
+
+  display.load({ color: true })
+  t.equal(log.useColor(), true)
+
+  display.load({ unicode: true })
+  t.equal(log.gauge._theme.hasUnicode, true)
+
+  display.load({ unicode: false })
+  t.equal(log.gauge._theme.hasUnicode, false)
+
+  mockGlobals(t, { 'process.stderr.isTTY': true })
+  display.load({ progress: true })
+  t.equal(log.progressEnabled, true)
+})
+
+t.test('can log', async (t) => {
+  const explains = []
+  const { display, logs } = mockDisplay(t, {
+    npmlog: {
+      error: (...args) => logs.push(['error', ...args]),
+      warn: (...args) => logs.push(['warn', ...args]),
+    },
+    '../../../lib/utils/explain-eresolve.js': {
+      explain: (...args) => {
+        explains.push(args)
+        return 'explanation'
+      },
+    },
+  })
+
+  display.log('error', 'test')
+  t.match(logs.error, [['test']])
+
+  display.log('warn', 'ERESOLVE', 'hello', { some: 'object' })
+  t.match(logs.warn, [['ERESOLVE', 'hello']])
+  t.match(explains, [[{ some: 'object' }, false, 2]])
+})
+
+t.test('handles log throwing', async (t) => {
+  const errors = []
+  mockGlobals(t, {
+    'console.error': (...args) => errors.push(args),
+  })
+  const { display } = mockDisplay(t, {
+    npmlog: {
+      verbose: () => {
+        throw new Error('verbose')
+      },
+    },
+    '../../../lib/utils/explain-eresolve.js': {
+      explain: () => {
+        throw new Error('explain')
+      },
+    },
+  })
+
+  display.log('warn', 'ERESOLVE', 'hello', { some: 'object' })
+  t.match(errors, [
+    [/attempt to log .* crashed/, Error('explain'), Error('verbose')],
+  ])
+})