Add test262 uglify tester

tools/ecmaTester.js

@@ -0,0 +1,51 @@
+#! /usr/bin/env node
+
+// Runs a test262(-like) script through the uglifyjs minifier with default options
+// It is expected to minify and execute the script without problems
+// as a failed test is indicated by throwing an exception.
+
+// argv number 2 is assumed to be the input file
+var file = process.argv[2];
+
+var fs = require("fs");
+var vm = require("vm");
+var UglifyJS = require("./node.js");
+
+console.log("Using node " + process.versions.node);
+console.log(process.versions);
+
+var result = "[Nothing]";
+try {
+    // Compress file
+    result = UglifyJS.minify(file).code;
+    // Run result to make sure the script is still runable
+    vm.runInNewContext(result, {});
+
+} catch(e) {
+    // Report
+    console.log("A minified script failed to run");
+    console.log("file: " + file);
+    console.log("minified output:");
+    console.log(result);
+    console.log();
+    console.log("==========");
+    console.log(e);
+    console.log(e.stack);
+    console.log();
+    console.log("Now running script without minification...");
+    console.log();
+
+    // Make sure script runs fine without compiling as well
+    input = fs.readFileSync(file, {encoding: 'utf8'});
+    try {
+        vm.runInNewContext(input, {});
+        console.log("Ran without problems unminified");
+    } catch (e2) {
+        console.log("Failed to run script unminified as well");
+        console.log(e2.stack);
+
+        process.exit(2); // Nope...
+    }
+
+    process.exit(1); // We found a great mystery to solve
+}