1 files changed, 82 insertions, 0 deletions
diff --git a/test/lib/utils/timers.js b/test/lib/utils/timers.js
new file mode 100644
index 000000000..6127f346b
--- /dev/null
+++ b/test/lib/utils/timers.js
@@ -0,0 +1,82 @@
+const t = require('tap')
+const { resolve } = require('path')
+const fs = require('graceful-fs')
+const mockLogs = require('../../fixtures/mock-logs')
+
+const mockTimers = (t, options) => {
+  const { logs, logMocks } = mockLogs()
+  const Timers = t.mock('../../../lib/utils/timers', {
+    ...logMocks,
+  })
+  const timers = new Timers(options)
+  t.teardown(() => timers.off())
+  return { timers, logs }
+}
+
+t.test('getters', async (t) => {
+  const { timers } = mockTimers(t)
+  t.match(timers.unfinished, new Map())
+  t.match(timers.finished, {})
+})
+
+t.test('listens/stops on process', async (t) => {
+  const { timers } = mockTimers(t)
+  process.emit('time', 'foo')
+  process.emit('time', 'bar')
+  process.emit('timeEnd', 'bar')
+  t.match(timers.unfinished, new Map([['foo', Number]]))
+  t.match(timers.finished, { bar: Number })
+  timers.off()
+  process.emit('time', 'baz')
+  t.notOk(timers.unfinished.get('baz'))
+})
+
+t.test('initial timer', async (t) => {
+  const { timers } = mockTimers(t, { start: 'foo' })
+  process.emit('timeEnd', 'foo')
+  t.match(timers.finished, { foo: Number })
+})
+
+t.test('initial listener', async (t) => {
+  const events = []
+  const listener = (...args) => events.push(args)
+  const { timers } = mockTimers(t, { listener })
+  process.emit('time', 'foo')
+  process.emit('time', 'bar')
+  process.emit('timeEnd', 'bar')
+  timers.off(listener)
+  process.emit('timeEnd', 'foo')
+  t.equal(events.length, 1)
+  t.match(events, [['bar', Number]])
+})
+
+t.test('finish unstarted timer', async (t) => {
+  const { logs } = mockTimers(t)
+  process.emit('timeEnd', 'foo')
+  t.match(logs.silly, [['timing', /^Tried to end timer/, 'foo']])
+})
+
+t.test('writes file', async (t) => {
+  const { timers } = mockTimers(t)
+  const dir = t.testdir()
+  process.emit('time', 'foo')
+  process.emit('timeEnd', 'foo')
+  timers.load({ dir })
+  timers.writeFile({ some: 'data' })
+  const data = JSON.parse(fs.readFileSync(resolve(dir, '_timing.json')))
+  t.match(data, {
+    some: 'data',
+    foo: Number,
+    unfinished: {
+      npm: [Number, Number],
+    },
+  })
+})
+
+t.test('fails to write file', async (t) => {
+  const { logs, timers } = mockTimers(t)
+  timers.writeFile()
+  t.match(logs.warn, [
+    ['timing', 'could not write timing file', Error],
+  ])
+})