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-rw-r--r--actionpack/lib/action_dispatch/routing/mapper.rb4
-rw-r--r--actionpack/test/dispatch/mapper_test.rb9
2 files changed, 13 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 53a4afecb3..a49b12621e 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -430,6 +430,10 @@ module ActionDispatch
if options
path = options.delete(:at)
else
+ unless Hash === app
+ raise ArgumentError, "must be called with mount point"
+ end
+
options = app
app, path = options.find { |k, v| k.respond_to?(:call) }
options.delete(app) if app
diff --git a/actionpack/test/dispatch/mapper_test.rb b/actionpack/test/dispatch/mapper_test.rb
index 8070bdec8a..58457b0c28 100644
--- a/actionpack/test/dispatch/mapper_test.rb
+++ b/actionpack/test/dispatch/mapper_test.rb
@@ -98,6 +98,15 @@ module ActionDispatch
mapper.get '/*path', :to => 'pages#show', :format => true
assert_equal '/*path.:format', fakeset.conditions.first[:path_info]
end
+
+ def test_raising_helpful_error_on_invalid_arguments
+ fakeset = FakeSet.new
+ mapper = Mapper.new fakeset
+ app = lambda { |env| [200, {}, [""]] }
+ assert_raises ArgumentError do
+ mapper.mount app
+ end
+ end
end
end
end