specs and scenarios for negative cases (failure messages)

features/generator_spec.feature

@@ -94,11 +94,20 @@ Feature: generator spec
           subject { file('public/my_dir/awesome.html') }
           it { should_not contain 'This is an awesome file' }
           it { should     contain 'This text is not in the file' }
+          it { should_not exist }
+        end
+        describe 'public/my_dir/non_existent.html' do
+          subject { file('public/my_dir/non_existent.html') }
+          it { should exist }
+        end
+        describe 'db/migrate/non_existent_migration.rb' do
+          subject { migration_file('db/migrate/non_existent_migration.rb') }
+          it { should exist }
         end
       end
       """
     When I run `rake spec`
-    Then the output should contain "2 examples, 2 failures"
+    Then the output should contain "5 examples, 5 failures"
      And the output should contain:
        """
        /tmp/public/my_dir/awesome.html to not contain "This is an awesome file" but it did
@@ -107,6 +116,18 @@ Feature: generator spec
        """
        /tmp/public/my_dir/awesome.html to contain "This text is not in the file" but it contained "This is an awesome file"
        """
+     And the output should contain:
+       """
+       /tmp/public/my_dir/awesome.html" not to exist
+       """
+     And the output should contain:
+       """
+       /tmp/public/my_dir/non_existent.html" to exist
+       """
+     And the output should contain:
+       """
+       db/migrate/TIMESTAMP_non_existent_migration.rb" to exist
+       """
 
   Scenario: A generator that creates a migration
     Given a file named "spec/generators/a_migration_spec.rb" with:

lib/ammeter/rspec/generator/example/generator_example_group.rb

@@ -69,7 +69,9 @@ def file relative
         end
         def migration_file relative
           file_path = file(relative)
-          Dir.glob("#{File.dirname(file_path)}/[0-9]*_#{File.basename(file_path)}").first
+          migration_file = Dir.glob("#{File.dirname(file_path)}/[0-9]*_#{File.basename(file_path)}").first
+          migration_file = "#{File.dirname(file_path)}/TIMESTAMP_#{File.basename(file_path)}" if migration_file.nil?
+          migration_file
         end
       end
     end

spec/ammeter/rspec/rails/generator/example/generator_example_group_spec.rb

@@ -53,13 +53,19 @@ module Ammeter::RSpec::Rails
           group.file('app/model/post.rb').should == "#{path_to_gem_root_tmp}/app/model/post.rb"
         end
 
-        it 'should use destination to find relative root file' do
-          tmp_db_migrate = path_to_gem_root_tmp + '/db/migrate'
-          FileUtils.mkdir_p tmp_db_migrate
-          FileUtils.touch(tmp_db_migrate + '/20111010200000_create_comments.rb')
-          FileUtils.touch(tmp_db_migrate + '/20111010203337_create_posts.rb')
-
-          group.migration_file('db/migrate/create_posts.rb').should == "#{path_to_gem_root_tmp}/db/migrate/20111010203337_create_posts.rb"
+        describe 'migrations' do
+          before do
+            tmp_db_migrate = path_to_gem_root_tmp + '/db/migrate'
+            FileUtils.mkdir_p tmp_db_migrate
+            FileUtils.touch(tmp_db_migrate + '/20111010200000_create_comments.rb')
+            FileUtils.touch(tmp_db_migrate + '/20111010203337_create_posts.rb')
+          end
+          it 'should use destination to find relative root file' do
+            group.migration_file('db/migrate/create_posts.rb').should == "#{path_to_gem_root_tmp}/db/migrate/20111010203337_create_posts.rb"
+          end
+          it 'should stick "TIMESTAMP" in when migration does not exist' do
+            group.migration_file('db/migrate/migration_that_is_not_there.rb').should == "#{path_to_gem_root_tmp}/db/migrate/TIMESTAMP_migration_that_is_not_there.rb"
+          end
         end
       end
     end