Fix(generate): Add error message for blueprints that do not exist. Throw error for the caller to respond to. Update test to have invalid generator error thrown

tooling/generate.js

@@ -36,6 +36,10 @@ Generate.generate = function generate(options) {
     options.generatorName = 'page';
   }
 
+  if (!Generate.generators[options.generatorName]) {
+    throw new Error('There is no generator available with that name: ' +   options.generatorName + '.');
+  }
+
   var generateOptions = {
     appDirectory: options.appDirectory,
     cssClassName: Generate.cssClassName(options.name),
@@ -117,7 +121,8 @@ Generate.loadGenerators = function loadGenerators() {
       return;
     }
     var generatorName = file.replace('.js', '');
-    generators[generatorName] = Generate.loadGenerator(generatorName);
+    var generator = Generate.loadGenerator(generatorName);
+    generators[generatorName] = generator;
   });
   return generators;
 };

tooling/index.js

@@ -1,3 +1,5 @@
+var Generate = require('./generate');
 module.exports = {
-  generate: require('./generate').generate
+  Generate: Generate,
+  generate: Generate.generate
 };

tooling/spec/generate.spec.js

@@ -34,6 +34,13 @@ describe('#Generate', function() {
       expect(Generate.generate).toThrow('No options passed to generator');
     });
 
+    it('should throw an error trying to use a generator that does not exist', function() {
+      var generatorOptions = { appDirectory: '/fake/ionic/path', name: 'About', generatorName: 'tabz' };
+      expect(function() {
+        Generate.generate(generatorOptions);
+      }).toThrow('There is no generator available with that name: tabz.');
+    });
+
     it('should call the appropriate generator', function() {
       spyOn(Generate, 'createScaffoldDirectories');
       var generatorOptions = { appDirectory: '/fake/ionic/path', name: 'About', generatorName: 'page' };