fix tests

stub rbenv-help for rbenv-install and rbenv-uninstall help messages

test/rbenv.bats

@@ -149,39 +149,63 @@ OUT
 
 @test "not enough arguments for rbenv-install" {
   stub_ruby_build
+  stub rbenv-help 'echo "Usage: rbenv install"'
+
   run rbenv-install
   assert_failure
   assert_output_contains 'Usage: rbenv install'
+
+  unstub rbenv-help
 }
 
 @test "too many arguments for rbenv-install" {
   stub_ruby_build
+  stub rbenv-help 'echo "Usage: rbenv install"'
+
   run rbenv-install 2.1.1 2.1.2
   assert_failure
   assert_output_contains 'Usage: rbenv install'
+
+  unstub rbenv-help
 }
 
 @test "show help for rbenv-install" {
   stub_ruby_build
+  stub rbenv-help 'echo "Usage: rbenv install"'
+
   run rbenv-install -h
   assert_success
   assert_output_contains 'Usage: rbenv install'
+
+  unstub rbenv-help
 }
 
 @test "not enough arguments rbenv-uninstall" {
+  stub rbenv-help 'echo "Usage: rbenv uninstall"'
+
   run rbenv-uninstall
   assert_failure
   assert_output_contains 'Usage: rbenv uninstall'
+
+  unstub rbenv-help
 }
 
 @test "too many arguments for rbenv-uninstall" {
+  stub rbenv-help 'echo "Usage: rbenv uninstall"'
+
   run rbenv-uninstall 2.1.1 2.1.2
   assert_failure
   assert_output_contains 'Usage: rbenv uninstall'
+
+  unstub rbenv-help
 }
 
 @test "show help for rbenv-uninstall" {
+  stub rbenv-help 'echo "Usage: rbenv uninstall"'
+
   run rbenv-uninstall -h
   assert_success
   assert_output_contains 'Usage: rbenv uninstall'
+
+  unstub rbenv-help
 }