Add tests for bin/wheneverize (#640)

* Add tests for bin/wheneverize

* Move FileUtils#mkdir and #touch into before block

test/unit/executable_test.rb

@@ -0,0 +1,141 @@
+require 'test_helper'
+
+describe 'Executable' do
+  describe 'bin/wheneverize' do
+    describe 'ARGV is not empty' do
+      describe 'file does not exist' do
+        file = '/tmp/this_does_not_exist'
+
+        it 'prints STDERR' do
+          out, err = capture_subprocess_io do
+            system('wheneverize', file)
+          end
+
+          assert_empty(out)
+          assert_match(/`#{file}' does not exist./, err)
+        end
+      end
+
+      describe 'file exists, but not a directory' do
+        file = '/tmp/this_is_a_file.txt'
+        before { FileUtils.touch(file) }
+
+        it 'prints STDERR' do
+          begin
+            out, err = capture_subprocess_io do
+              system('wheneverize', file)
+            end
+
+            assert_empty(out)
+            assert_match(/`#{file}' is not a directory./, err)
+          ensure
+            FileUtils.rm(file)
+          end
+        end
+      end
+
+      describe 'file is a directory, but another param(s) are given as well' do
+        file = '/tmp/this_is_a_directory'
+        before { FileUtils.mkdir(file) }
+
+        it 'prints STDERR' do
+          begin
+            out, err = capture_subprocess_io do
+              system('wheneverize', file, 'another', 'parameters')
+            end
+
+            assert_empty(out)
+            assert_match(/#{"Too many arguments; please specify only the " \
+                         "directory to wheneverize."}/, err)
+          ensure
+            FileUtils.rmdir(file)
+          end
+        end
+      end
+    end
+
+    describe 'ARGV is empty' do
+      dir  = '.'
+      file = 'config/schedule.rb'
+      path = File.join(dir, file)
+
+      describe 'config file already exists' do
+        before do
+          FileUtils.mkdir(File.dirname(path))
+          FileUtils.touch(path)
+        end
+
+        it 'prints STDOUT and STDERR' do
+          begin
+            out, err = capture_subprocess_io do
+              system('wheneverize')
+            end
+
+            assert_match(/\[done\] wheneverized!/, out)
+            assert_match(/\[skip\] `#{path}' already exists/, err)
+          ensure
+            FileUtils.rm_rf(File.dirname(path))
+          end
+        end
+      end
+
+      describe 'config directory does not exist' do
+        it 'prints STDOUT and STDERR' do
+          out, err = capture_subprocess_io do
+            system('wheneverize')
+          end
+
+          assert_match(/\[done\] wheneverized!/, out)
+          assert_match(
+            %r{\[skip\] directory `#{File.dirname(path)}' does not exist},
+            err
+          )
+        end
+      end
+
+      describe 'config directory exists, but file does not' do
+        before { FileUtils.mkdir(File.dirname(path)) }
+
+        it 'writes config file and prints STDOUT' do
+          begin
+            out, err = capture_subprocess_io do
+              system('wheneverize')
+            end
+
+            assert_empty(err)
+            assert_match(
+              /\[add\] writing `#{path}'\n\[done\] wheneverized!/,
+              out
+            )
+
+            assert_match((<<-FILE
+# Use this file to easily define all of your cron jobs.
+#
+# It's helpful, but not entirely necessary to understand cron before proceeding.
+# http://en.wikipedia.org/wiki/Cron
+
+# Example:
+#
+# set :output, "/path/to/my/cron_log.log"
+#
+# every 2.hours do
+#   command "/usr/bin/some_great_command"
+#   runner "MyModel.some_method"
+#   rake "some:great:rake:task"
+# end
+#
+# every 4.days do
+#   runner "AnotherModel.prune_old_records"
+# end
+
+# Learn more: http://github.com/javan/whenever
+FILE
+                         ), IO.read(path))
+          ensure
+            FileUtils.rm_rf(File.dirname(path))
+          end
+        end
+      end
+    end
+  end
+end