fixed #306 - Raise an explicit error on invalid test path

@@ -80,6 +80,7 @@ Also, `Casper.mouseEvent()` will now directly trigger an error on failure instea
 
 ### Bugfixes & enhancements
 
+- fixed [#306](https://github.com/n1k0/casperjs/issues/306) - Raise an explicit error on invalid test path
 - fixed [#300](https://github.com/n1k0/casperjs/issues/300) - Ensure that `findOne()` and `findAll()` observe the scope for XPath expressions, not just when passed CSS selectors
 - fixed [#294](https://github.com/n1k0/casperjs/issues/294) - Automatically fail test on any runtime error or timeout
 - fixed [#281](https://github.com/n1k0/casperjs/issues/281) - `Casper.evaluate()` should take an array as context not object

@@ -290,12 +290,9 @@ function bootstrap(global) {
             phantom.exit(0);
         }
 
-
         if (!phantom.casperScript) {
             phantom.casperScript = phantom.casperArgs.get(0);
-        }
-
-        if (phantom.casperScript) {
+        } else {
             if (!fs.isFile(phantom.casperScript)) {
                 console.error('Unable to open file: ' + phantom.casperScript);
                 phantom.exit(1);

-/*global phantom*/
+/*global phantom CasperError*/
 
 if (!phantom.casperLoaded) {
     console.log('This script must be invoked using the casperjs executable');
@@ -50,36 +50,42 @@ function checkIncludeFile(include) {
     return absInclude;
 }
 
-// parse some options from cli
-casper.options.verbose = casper.cli.get('direct') || false;
-casper.options.logLevel = casper.cli.get('log-level') || "error";
-if (casper.cli.get('no-colors') === true) {
+function checkArgs() {
+    "use strict";
+    // parse some options from cli
+    casper.options.verbose = casper.cli.get('direct') || false;
+    casper.options.logLevel = casper.cli.get('log-level') || "error";
+    if (casper.cli.get('no-colors') === true) {
         var cls = 'Dummy';
         casper.options.colorizerType = cls;
         casper.colorizer = colorizer.create(cls);
-}
-casper.test.options.failFast = casper.cli.get('fail-fast') || false;
+    }
+    casper.test.options.failFast = casper.cli.get('fail-fast') || false;
 
-// test paths are passed as args
-if (casper.cli.args.length) {
+    // test paths are passed as args
+    if (casper.cli.args.length) {
         tests = casper.cli.args.filter(function(path) {
-        "use strict";
-        return fs.isFile(path) || fs.isDirectory(path);
+            if (fs.isFile(path) || fs.isDirectory(path)) {
+                return true;
+            }
+            throw new CasperError(f("Invalid test path: %s", path));
         });
-} else {
+    } else {
         casper.echo('No test path passed, exiting.', 'RED_BAR', 80);
         casper.exit(1);
-}
+    }
 
-// check for casper selftests
-if (!phantom.casperSelfTest && checkSelfTest(tests)) {
+    // check for casper selftests
+    if (!phantom.casperSelfTest && checkSelfTest(tests)) {
         casper.warn('To run casper self tests, use the `selftest` command.');
         casper.exit(1);
+    }
 }
 
-// includes handling
-this.loadIncludes.forEach(function(include){
+function initRunner() {
     "use strict";
+    // includes handling
+    loadIncludes.forEach(function(include){
         var container;
         if (casper.cli.has(include)) {
             container = casper.cli.get(include).split(',').map(function(file) {
@@ -89,16 +95,27 @@ this.loadIncludes.forEach(function(include){
             });
             casper.test.loadIncludes[include] = utils.unique(container);
         }
-});
+    });
 
-// test suites completion listener
-casper.test.on('tests.complete', function() {
-    "use strict";
+    // test suites completion listener
+    casper.test.on('tests.complete', function() {
         this.renderResults(true, undefined, casper.cli.get('xunit') || undefined);
         if (this.options.failFast && this.testResults.failures.length > 0) {
             casper.warn('Test suite failed fast, all tests may not have been executed.');
         }
-});
+    });
+}
 
-// run all the suites
-casper.test.runSuites.apply(casper.test, tests);
+var error;
+try {
+    checkArgs();
+} catch (e) {
+    error = true;
+    casper.warn(e);
+    casper.exit(1);
+}
+
+if (!error) {
+    initRunner();
+    casper.test.runSuites.apply(casper.test, tests);
+}