test: minor fixes to test-module-loading.js

Use block scope for local variables only used in a small code block.
Fixed inverse arguments in some usages of Assert.strictEqual.

PR-URL: https://github.com/nodejs/node/pull/12728
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/sequential/test-module-loading.js

@@ -35,59 +35,68 @@ assert.strictEqual(process.mainModule, module,
 // assert that it's *not* the main module in the required module.
 require('../fixtures/not-main-module.js');
 
+{
   // require a file with a request that includes the extension
   const a_js = require('../fixtures/a.js');
-assert.strictEqual(42, a_js.number);
+  assert.strictEqual(a_js.number, 42);
+}
 
+{
   // require a file without any extensions
   const foo_no_ext = require('../fixtures/foo');
-assert.strictEqual('ok', foo_no_ext.foo);
+  assert.strictEqual(foo_no_ext.foo, 'ok');
+}
 
 const a = require('../fixtures/a');
-const c = require('../fixtures/b/c');
 const d = require('../fixtures/b/d');
 const d2 = require('../fixtures/b/d');
+
+{
+  const c = require('../fixtures/b/c');
   // Absolute
   const d3 = require(path.join(__dirname, '../fixtures/b/d'));
   // Relative
   const d4 = require('../fixtures/b/d');
 
-assert.strictEqual(false, false, 'testing the test program.');
-
   assert.ok(a.A instanceof Function);
-assert.strictEqual('A', a.A());
+  assert.strictEqual(a.A(), 'A');
 
   assert.ok(a.C instanceof Function);
-assert.strictEqual('C', a.C());
+  assert.strictEqual(a.C(), 'C');
 
   assert.ok(a.D instanceof Function);
-assert.strictEqual('D', a.D());
+  assert.strictEqual(a.D(), 'D');
 
   assert.ok(d.D instanceof Function);
-assert.strictEqual('D', d.D());
+  assert.strictEqual(d.D(), 'D');
 
   assert.ok(d2.D instanceof Function);
-assert.strictEqual('D', d2.D());
+  assert.strictEqual(d2.D(), 'D');
 
   assert.ok(d3.D instanceof Function);
-assert.strictEqual('D', d3.D());
+  assert.strictEqual(d3.D(), 'D');
 
   assert.ok(d4.D instanceof Function);
-assert.strictEqual('D', d4.D());
+  assert.strictEqual(d4.D(), 'D');
 
   assert.ok((new a.SomeClass()) instanceof c.SomeClass);
+}
 
+{
   console.error('test index.js modules ids and relative loading');
   const one = require('../fixtures/nested-index/one');
   const two = require('../fixtures/nested-index/two');
   assert.notStrictEqual(one.hello, two.hello);
+}
 
+{
   console.error('test index.js in a folder with a trailing slash');
   const three = require('../fixtures/nested-index/three');
   const threeFolder = require('../fixtures/nested-index/three/');
   const threeIndex = require('../fixtures/nested-index/three/index.js');
   assert.strictEqual(threeFolder, threeIndex);
   assert.notStrictEqual(threeFolder, three);
+}
 
 console.error('test package.json require() loading');
 assert.throws(
@@ -104,17 +113,20 @@ assert.strictEqual(require('../fixtures/packages/main').ok, 'ok',
 assert.strictEqual(require('../fixtures/packages/main-index').ok, 'ok',
                    'Failed loading package with index.js in main subdir');
 
+{
   console.error('test cycles containing a .. path');
   const root = require('../fixtures/cycles/root');
   const foo = require('../fixtures/cycles/folder/foo');
   assert.strictEqual(root.foo, foo);
   assert.strictEqual(root.sayHello(), root.hello);
+}
 
 console.error('test node_modules folders');
 // asserts are in the fixtures files themselves,
 // since they depend on the folder structure.
 require('../fixtures/node_modules/foo');
 
+{
   console.error('test name clashes');
   // this one exists and should import the local module
   const my_path = require('../fixtures/path');
@@ -122,13 +134,14 @@ assert.ok(my_path.path_func instanceof Function);
   // this one does not exist and should throw
   assert.throws(function() { require('./utils'); },
                 /^Error: Cannot find module '\.\/utils'$/);
+}
 
 let errorThrown = false;
 try {
   require('../fixtures/throws_error');
 } catch (e) {
   errorThrown = true;
-  assert.strictEqual('blah', e.message);
+  assert.strictEqual(e.message, 'blah');
 }
 
 assert.strictEqual(require('path').dirname(__filename), __dirname);
@@ -136,7 +149,7 @@ assert.strictEqual(require('path').dirname(__filename), __dirname);
 console.error('load custom file types with extensions');
 require.extensions['.test'] = function(module, filename) {
   let content = fs.readFileSync(filename).toString();
-  assert.strictEqual('this is custom source\n', content);
+  assert.strictEqual(content, 'this is custom source\n');
   content = content.replace('this is custom source',
                             'exports.test = \'passed\'');
   module._compile(content, filename);
@@ -166,6 +179,7 @@ try {
   assert.strictEqual(err.message, 'Cannot find module \'../fixtures/empty\'');
 }
 
+{
   // Check load order is as expected
   console.error('load order');
 
@@ -191,17 +205,21 @@ try {
   } catch (e) {
     assert.ok(e.message.replace(/\\/g, '/').match(/file7\/index\.node/));
   }
-assert.strictEqual(require(loadOrder + 'file8').file8, 'file8/index.reg', msg);
+  assert.strictEqual(require(loadOrder + 'file8').file8, 'file8/index.reg',
-assert.strictEqual(require(loadOrder + 'file9').file9, 'file9/index.reg2', msg);
+                     msg);
-
+  assert.strictEqual(require(loadOrder + 'file9').file9, 'file9/index.reg2',
+                     msg);
+}
 
+{
   // make sure that module.require() is the same as
   // doing require() inside of that module.
   const parent = require('../fixtures/module-require/parent/');
   const child = require('../fixtures/module-require/child/');
   assert.strictEqual(child.loaded, parent.loaded);
+}
 
-
+{
   // #1357 Loading JSON files with require()
   const json = require('../fixtures/packages/main/package.json');
   assert.deepStrictEqual(json, {
@@ -209,8 +227,10 @@ assert.deepStrictEqual(json, {
     version: '1.2.3',
     main: 'package-main-module'
   });
+}
 
 
+{
   // now verify that module.children contains all the different
   // modules that we've required, and that all of them contain
   // the appropriate children, and so on.
@@ -274,6 +294,7 @@ assert.deepStrictEqual(children, {
     },
     'fixtures/packages/main/package.json': {}
   });
+}
 
 
 // require() must take string, and must be truthy
@@ -289,29 +310,29 @@ assert.throws(function() {
 
 process.on('exit', function() {
   assert.ok(a.A instanceof Function);
-  assert.strictEqual('A done', a.A());
+  assert.strictEqual(a.A(), 'A done');
 
   assert.ok(a.C instanceof Function);
-  assert.strictEqual('C done', a.C());
+  assert.strictEqual(a.C(), 'C done');
 
   assert.ok(a.D instanceof Function);
-  assert.strictEqual('D done', a.D());
+  assert.strictEqual(a.D(), 'D done');
 
   assert.ok(d.D instanceof Function);
-  assert.strictEqual('D done', d.D());
+  assert.strictEqual(d.D(), 'D done');
 
   assert.ok(d2.D instanceof Function);
-  assert.strictEqual('D done', d2.D());
+  assert.strictEqual(d2.D(), 'D done');
 
-  assert.strictEqual(true, errorThrown);
+  assert.strictEqual(errorThrown, true);
 
   console.log('exit');
 });
 
 
 // #1440 Loading files with a byte order marker.
-assert.strictEqual(42, require('../fixtures/utf8-bom.js'));
+assert.strictEqual(require('../fixtures/utf8-bom.js'), 42);
-assert.strictEqual(42, require('../fixtures/utf8-bom.json'));
+assert.strictEqual(require('../fixtures/utf8-bom.json'), 42);
 
 // Error on the first line of a module should
 // have the correct line number