test: refactor test-vm-static-this.js

Remove console statements and prefer strictEqual() over equal()
in assertions.

PR-URL: nodejs#9887
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-vm-static-this.js

@@ -5,21 +5,21 @@ var vm = require('vm');
 
 common.globalCheck = false;
 
-console.error('run a string');
+// Run a string
 var result = vm.runInThisContext('\'passed\';');
-assert.equal('passed', result);
+assert.strictEqual('passed', result);
 
-console.error('thrown error');
+// thrown error
 assert.throws(function() {
   vm.runInThisContext('throw new Error(\'test\');');
 }, /test/);
 
 global.hello = 5;
 vm.runInThisContext('hello = 2');
-assert.equal(2, global.hello);
+assert.strictEqual(2, global.hello);
 
 
-console.error('pass values');
+// pass values
 var code = 'foo = 1;' +
            'bar = 2;' +
            'if (typeof baz !== \'undefined\') throw new Error(\'test fail\');';
@@ -28,11 +28,11 @@ global.obj = { foo: 0, baz: 3 };
 /* eslint-disable no-unused-vars */
 var baz = vm.runInThisContext(code);
 /* eslint-enable no-unused-vars */
-assert.equal(0, global.obj.foo);
-assert.equal(2, global.bar);
-assert.equal(1, global.foo);
+assert.strictEqual(0, global.obj.foo);
+assert.strictEqual(2, global.bar);
+assert.strictEqual(1, global.foo);
 
-console.error('call a function');
+// call a function
 global.f = function() { global.foo = 100; };
 vm.runInThisContext('f()');
-assert.equal(100, global.foo);
+assert.strictEqual(100, global.foo);