Merge pull request #728 from n1k0/prevent-casper-instance-creation-in-test-env

Prevent overriding of preconfigured casper instance in a test environment

@@ -48,6 +48,13 @@ var defaultUserAgent = phantom.defaultPageSettings.userAgent
 
 exports.create = function create(options) {
     "use strict";
+    // This is a bit of a hack to check if one is trying to override the preconfigured
+    // casper instance from within a test environment.
+    if (phantom.casperTest && window.casper) {
+        console.error("Fatal: you can't override the preconfigured casper instance in a test environment.");
+        console.error("Docs: http://docs.casperjs.org/en/latest/testing.html#test-command-args-and-options");
+        phantom.exit(1);
+    }
     return new Casper(options);
 };
 

@@ -304,6 +304,13 @@ class TestCommandOutputTest(CasperExecTestBase):
         ], failing=True)
 
     @timeout(20)
+    def test_casper_test_instance_overriding(self):
+        script_path = os.path.join(TEST_ROOT, 'tester', 'casper-instance-override.js')
+        self.assertCommandOutputContains('test ' + script_path, [
+            "Fatal: you can't override the preconfigured casper instance",
+        ], failing=True)
+
+    @timeout(20)
     def test_dubious_test(self):
         script_path = os.path.join(TEST_ROOT, 'tester', 'dubious.js')
         self.assertCommandOutputContains('test ' + script_path, [

+// this should never happen
+// http://docs.casperjs.org/en/latest/testing.html#test-command-args-and-options
+var casper = require("casper").create();
+
+casper.test.begin("foo", function(test) {
+  "use strict";
+  test.assert(true);
+  test.done();
+});