node.d.ts: Create tests for "vm" module

node/node-tests.ts

@@ -16,6 +16,7 @@ import * as path from "path";
 import * as readline from "readline";
 import * as childProcess from "child_process";
 import * as os from "os";
+import * as vm from "vm";
 // Specifically test buffer module regression.
 import {Buffer as ImportedBuffer, SlowBuffer as ImportedSlowBuffer} from "buffer";
 
@@ -679,3 +680,63 @@ namespace os_tests {
         result = os.networkInterfaces();
     }
 }
+
+////////////////////////////////////////////////////
+/// vm tests : https://nodejs.org/api/vm.html
+////////////////////////////////////////////////////
+
+namespace vm_tests {
+    {
+        const sandbox = {
+            animal: 'cat',
+            count: 2
+        };
+
+        const context = new vm.createContext(sandbox);
+        console.log(vm.isContext(context));
+        const script = new vm.Script('count += 1; name = "kitty"');
+
+        for (let i = 0; i < 10; ++i) {
+            script.runInContext(context);
+        }
+
+        console.log(util.inspect(sandbox));
+
+        vm.runInNewContext('count += 1; name = "kitty"', sandbox);
+        console.log(util.inspect(sandbox));
+    }
+
+    {
+        const sandboxes = [{}, {}, {}];
+
+        const script = new vm.Script('globalVar = "set"');
+
+        sandboxes.forEach((sandbox) => {
+            script.runInNewContext(sandbox);
+        });
+
+        console.log(util.inspect(sandboxes));
+    }
+
+    {
+        global.globalVar = 0;
+
+        const script = new vm.Script('globalVar += 1', { filename: 'myfile.vm' });
+
+        for (var i = 0; i < 1000; ++i) {
+            script.runInThisContext();
+        }
+
+        console.log(globalVar);
+
+        var localVar = 'initial value';
+        vm.runInThisContext('localVar = "vm";');
+
+        console.log(localVar);
+    }
+
+    {
+        const Debug = vm.runInDebugContext('Debug');
+        Debug.scripts().forEach(function(script) { console.log(script.name); });
+    }
+}