test: clean up repl-reset-event file

* Change vars to let/const
* Add mustCall
* equal -> strictEqual
* remove timeout

PR-URL: https://github.com/nodejs/node/pull/9931
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-repl-reset-event.js

@@ -1,52 +1,49 @@
 'use strict';
-var common = require('../common');
+const common = require('../common');
 common.globalCheck = false;
 
-var assert = require('assert');
-var repl = require('repl');
+const assert = require('assert');
+const repl = require('repl');
 
 // Create a dummy stream that does nothing
 const dummy = new common.ArrayStream();
 
 function testReset(cb) {
-  var r = repl.start({
+  const r = repl.start({
     input: dummy,
     output: dummy,
     useGlobal: false
   });
   r.context.foo = 42;
-  r.on('reset', function(context) {
+  r.on('reset', common.mustCall(function(context) {
     assert(!!context, 'REPL did not emit a context with reset event');
-    assert.equal(context, r.context, 'REPL emitted incorrect context');
-    assert.equal(context.foo, undefined, 'REPL emitted the previous context' +
-                 ', and is not using global as context');
+    assert.strictEqual(context, r.context, 'REPL emitted incorrect context');
+    assert.strictEqual(
+      context.foo,
+      undefined,
+      'REPL emitted the previous context, and is not using global as context'
+    );
     context.foo = 42;
     cb();
-  });
+  }));
   r.resetContext();
 }
 
-function testResetGlobal(cb) {
-  var r = repl.start({
+function testResetGlobal() {
+  const r = repl.start({
     input: dummy,
     output: dummy,
     useGlobal: true
   });
   r.context.foo = 42;
-  r.on('reset', function(context) {
-    assert.equal(context.foo, 42,
-                 '"foo" property is missing from REPL using global as context');
-    cb();
-  });
+  r.on('reset', common.mustCall(function(context) {
+    assert.strictEqual(
+      context.foo,
+      42,
+      '"foo" property is missing from REPL using global as context'
+    );
+  }));
   r.resetContext();
 }
 
-var timeout = setTimeout(function() {
-  common.fail('Timeout, REPL did not emit reset events');
-}, 5000);
-
-testReset(function() {
-  testResetGlobal(function() {
-    clearTimeout(timeout);
-  });
-});
+testReset(common.mustCall(testResetGlobal));