Enable code coverage

Former-commit-id: 9b52247b6e880f15895842e4ff34c15fc99fd1eb

Gruntfile.js

@@ -0,0 +1,63 @@
+module.exports = function(grunt) {
+
+  grunt.initConfig({
+    'shell': {
+      'options': {
+        'stdout': true,
+        'stderr': true,
+        'failOnError': true,
+        'execOptions': {
+          'cwd': 'test'
+        }
+      },
+      'cover': {
+        'command': 'istanbul cover --report "html" --verbose --dir "coverage" "test.js"'
+      },
+      'test-rhino': {
+        'command': 'echo "Testing in Rhino..."; rhino -opt -1 "test.js" "../dist/lodash.compat.js"; rhino -opt -1 "test.js" "../dist/lodash.compat.min.js"'
+      },
+      'test-rhino-require': {
+        'command': 'echo "Testing in Rhino with -require..."; rhino -opt -1 -require "test.js" "../dist/lodash.compat.js"; rhino -opt -1 -require "test.js" "../dist/lodash.compat.min.js";'
+      },
+      'test-ringo': {
+        'command': 'echo "Testing in Ringo..."; ringo -o -1 "test.js" "../dist/lodash.compat.js"; ringo -o -1 "test.js" "../dist/lodash.compat.min.js"'
+      },
+      'test-phantomjs': {
+        'command': 'echo "Testing in PhantomJS..."; phantomjs "test.js" "../dist/lodash.compat.js"; phantomjs "test.js" "../dist/lodash.compat.min.js"'
+      },
+      'test-narwhal': {
+        'command': 'echo "Testing in Narwhal..."; export NARWHAL_OPTIMIZATION=-1; narwhal "test.js" "../dist/lodash.compat.js"; narwhal "test.js" "../dist/lodash.compat.min.js"'
+      },
+      'test-node': {
+        'command': 'echo "Testing in Node..."; node "test.js" "../dist/lodash.compat.js"; node "test.js" "../dist/lodash.compat.min.js"'
+      },
+      'test-node-build': {
+        'command': 'echo "Testing build..."; node "test-build.js"'
+      },
+      'test-browser': {
+        'command': 'echo "Testing in a browser..."; open "index.html"'
+      }
+    }
+  });
+
+  grunt.loadNpmTasks('grunt-shell');
+
+  grunt.registerTask('cover', 'shell:cover');
+  grunt.registerTask('test', [
+    'shell:test-rhino',
+    //'shell:test-rhino-require',
+    'shell:test-ringo',
+    'shell:test-phantomjs',
+    'shell:test-narwhal',
+    'shell:test-node',
+    'shell:test-node-build',
+    'shell:test-browser'
+  ]);
+
+  grunt.registerTask('default', [
+    'shell:test-node',
+    'shell:test-node-build',
+    'cover'
+  ]);
+
+};