Do not test --unhandled-rejections on Node <12

Author: ehmicky

test/helpers/events/version.js

@@ -8,3 +8,10 @@ export const hasMultipleResolves = function() {
 }
 
 const MULTIPLE_RESOLVES_V = '10.12.0'
+
+// `--unhandled-rejections` was introduced in Node `12.0.0`
+export const hasUnhandledFlag = function() {
+  return semver.gte(version, UNHANDLED_FLAG_V)
+}
+
+const UNHANDLED_FLAG_V = '12.0.0'

test/warnings.js

@@ -3,6 +3,7 @@ import sinon from 'sinon'
 import testEach from 'test-each'
 
 import { EVENTS, EVENTS_MAP } from './helpers/events/main.js'
+import { hasUnhandledFlag } from './helpers/events/version.js'
 import { startLogging } from './helpers/init.js'
 import { normalizeMessage, normalizeCall } from './helpers/normalize.js'
 import { removeProcessListeners } from './helpers/remove.js'
@@ -57,13 +58,13 @@ test.serial(
   },
 )
 
+const UNHANDLED_FLAGS = hasUnhandledFlag()
+  ? ['--unhandled-rejections=none', '--unhandled-rejections=strict']
+  : []
+
 testEach(
   EVENTS,
-  [
-    '--no-warnings',
-    '--unhandled-rejections=none',
-    '--unhandled-rejections=strict',
-  ],
+  ['--no-warnings', ...UNHANDLED_FLAGS],
   ({ title }, { eventName }, flag) => {
     test(`should work with warnings-related CLI flags | ${title}`, async t => {
       t.snapshot(