improve AST fuzzing (#3740)

test/mozilla-ast.js

@@ -44,30 +44,37 @@ function test(original, estree, description) {
             try_beautify(transformed.code);
         }
         console.log("!!!!!! Failed... round", round);
-        process.exit(1);
+        return false;
     }
+    return true;
 }
 
 var num_iterations = ufuzz.num_iterations;
+var minify_options = require("./ufuzz/options.json").map(JSON.stringify);
+minify_options.unshift(null);
 for (var round = 1; round <= num_iterations; round++) {
     process.stdout.write(round + " of " + num_iterations + "\r");
     var code = ufuzz.createTopLevelCode();
-    var uglified = UglifyJS.minify(code, {
+    minify_options.forEach(function(options) {
+        var input = options ? UglifyJS.minify(code, JSON.parse(options)).code : code;
+        var uglified = UglifyJS.minify(input, {
             compress: false,
             mangle: false,
             output: {
                 ast: true
             }
         });
-    test(uglified.code, uglified.ast.to_mozilla_ast(), "AST_Node.to_mozilla_ast()");
+        var ok = test(uglified.code, uglified.ast.to_mozilla_ast(), "AST_Node.to_mozilla_ast()");
         try {
-        test(uglified.code, acorn.parse(code), "acorn.parse()");
+            ok = test(uglified.code, acorn.parse(input), "acorn.parse()") && ok;
         } catch (e) {
             console.log("//=============================================================");
             console.log("// acorn parser failed... round", round);
             console.log(e);
             console.log("// original code");
-        console.log(code);
+            console.log(input);
         }
+        if (!ok) process.exit(1);
+    });
 }
 console.log();