test: add unit test for log metadata colorizing

lib/utils/prettify-metadata.test.js

@@ -1,5 +1,6 @@
 'use strict'
 
+const getColorizer = require('../colors')
 const tap = require('tap')
 const prettifyMetadata = require('./prettify-metadata')
 const context = {
@@ -113,3 +114,36 @@ tap.test('uses prettifiers from passed prettifiers object', async t => {
   })
   t.equal(str, '(JOE/1234__ on BAR) <BAZ>')
 })
+
+tap.test('uses colorizer from passed context to colorize metadata', async t => {
+  const prettifiers = {
+    name (input, _key, log, { colors }) {
+      return colors.blue(input)
+    },
+    pid (input, _key, log, { colors }) {
+      return colors.red(input)
+    },
+    hostname (input, _key, log, { colors }) {
+      return colors.green(input)
+    },
+    caller (input, _key, log, { colors }) {
+      return colors.cyan(input)
+    }
+  }
+  const log = { name: 'foo', pid: '1234', hostname: 'bar', caller: 'baz' }
+  const colorizer = getColorizer(true)
+  const context = {
+    customPrettifiers: prettifiers,
+    colorizer
+  }
+
+  const result = prettifyMetadata({ log, context })
+
+  const colorizedName = colorizer.colors.blue(log.name)
+  const colorizedPid = colorizer.colors.red(log.pid)
+  const colorizedHostname = colorizer.colors.green(log.hostname)
+  const colorizedCaller = colorizer.colors.cyan(log.caller)
+  const expected = `(${colorizedName}/${colorizedPid} on ${colorizedHostname}) <${colorizedCaller}>`
+
+  t.equal(result, expected)
+})