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@@ -3,9 +3,15 @@ require 'active_support/test_case'
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 module ActionController
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   class NonInferrableControllerError < ActionControllerError
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     def initialize(name)
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+      @name = name
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       super "Unable to determine the controller to test from #{name}. " +
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         "You'll need to specify it using 'tests YourController' in your " +
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-        "test case definition"
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+        "test case definition. This could mean that #{inferred_controller_name} does not exist " +
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+        "or it contains syntax errors"
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+    end
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+
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+    def inferred_controller_name
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+      @name.sub(/Test$/, '')
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     end
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   end
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