esprima.js

@@ -2384,12 +2384,30 @@
         extra.errors.push(error);
     }
 
+    function constructError(msg, column) {
+        var error = new Error(msg);
+        try {
+            throw error;
+        } catch (base) {
+            /* istanbul ignore else */
+            if (Object.create && Object.defineProperty) {
+                error = Object.create(base);
+                Object.defineProperty(error, 'column', { value: column });
+            }
+        } finally {
+            return error;
+        }
+    }
+
     function createError(line, pos, description) {
-        var error = new Error('Line ' + line + ': ' + description);
-        error.index = pos;
+        var msg, column, error;
+
+        msg = 'Line ' + line + ': ' + description;
+        column = pos - (scanning ? lineStart : lastLineStart) + 1;
+        error = constructError(msg, column);
         error.lineNumber = line;
-        error.column = pos - (scanning ? lineStart : lastLineStart) + 1;
         error.description = description;
+        error.index = pos;
         return error;
     }
 

package.json

@@ -75,7 +75,7 @@
     "regression-tests": "node test/regression-tests.js",
     "tests": "npm run generate-fixtures && npm run unit-tests && npm run grammar-tests && npm run regression-tests",
     "generate-fixtures": "node tools/generate-fixtures.js",
-    "browser-tests": "npm run generate-fixtures && karma start --single-run",
+    "browser-tests": "npm run generate-fixtures && cd test && karma start --single-run",
     "analyze-coverage": "istanbul cover test/unit-tests.js",
     "check-coverage": "istanbul check-coverage --statement 100 --branch 100 --function 100",
     "dynamic-analysis": "npm run analyze-coverage && npm run check-coverage",

test/karma.conf.js

@@ -0,0 +1,51 @@
+module.exports = function (config) {
+    config.set({
+        basePath: '..',
+        frameworks: [
+            'mocha',
+            'detectBrowsers'
+        ],
+
+        files: [
+            'esprima.js',
+            'node_modules/lodash/index.js',
+            'test/dist/fixtures_js.js',
+            'test/dist/fixtures_json.js',
+            'test/utils/error-to-object.js',
+            'test/utils/create-testcases.js',
+            'test/utils/evaluate-testcase.js',
+            'test/browser-tests.js'
+        ],
+
+        exclude: [],
+
+        client: {
+            mocha: {
+                reporter: 'html', // change Karma's debug.html to the mocha web reporter
+                ui: 'bdd'
+            }
+        },
+
+        reporters: ['dots'], // available reporters: https://npmjs.org/browse/keyword/karma-reporter
+        port: 9876,
+        colors: true,
+        logLevel: config.LOG_WARN, // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+        autoWatch: true,
+        singleRun: false,
+
+        detectBrowsers: {
+            enabled: true,
+            usePhantomJS: false
+        },
+
+        plugins: [
+            'karma-mocha',
+            'karma-chrome-launcher',
+            'karma-firefox-launcher',
+            'karma-ie-launcher',
+            'karma-safari-launcher',
+            'karma-detect-browsers'
+        ]
+
+    });
+}