Use child processes to run each set of tests, in order to deal with t…

…he memory leak in vm.runInNewContext()

tests/run-child.js

@@ -0,0 +1,17 @@
+"use strict";
+
+var TestCase = require("./helper/test-case");
+var argv = require("yargs").argv;
+
+if (argv.language) {
+	process.on('message', function (data) {
+		if (data.filePath) {
+			try {
+				TestCase.runTestCase(argv.language, data.filePath);
+				process.send({success: true});
+			} catch (e) {
+				process.send({error: e});
+			}
+		}
+	});
+}

tests/run.js

@@ -1,9 +1,9 @@
 "use strict";
 
 var TestDiscovery = require("./helper/test-discovery");
-var TestCase = require("./helper/test-case");
 var path = require("path");
 var argv = require("yargs").argv;
+var child_process = require("child_process");
 
 var testSuite;
 if (argv.language) {
@@ -23,17 +23,45 @@ for (var language in testSuite) {
 		describe("Testing language '" + language + "'", function () {
 			this.timeout(10000);
 
+			// Each set of tests runs in its own child process
+			var child;
+			before(function () {
+				child = child_process.fork(__dirname + "/run-child.js", ['--language=' + language], {
+					stdio: 'inherit'
+				});
+			});
+
+			after(function () {
+				child.kill();
+			});
+
 			testFiles.forEach(
 				function (filePath) {
-					var fileName = path.basename(filePath, path.extname(filePath));
+			        var fileName = path.basename(filePath, path.extname(filePath));
 
-					it("– should pass test case '" + fileName + "'",
-						function () {
-							TestCase.runTestCase(language, filePath);
-						}
-					);
+			        it("– should pass test case '" + fileName + "'",
+			            function (done) {
+
+				            child.removeAllListeners('message');
+			                child.on('message', function (o) {
+				                // We have to delay the call,
+				                // otherwise the first message is received
+				                // over and over again.
+				                setTimeout(function() {
+					                if (o.error) {
+						                throw o.error;
+					                } else if (o.success) {
+						                done();
+					                }
+				                }, 1);
+			                });
+				            child.send({
+					            filePath: filePath
+				            });
+			            }
+			        );
 				}
 			);
 		});
 	})(language, testSuite[language]);
-}
+}