Prefer strings over regex expressions

In this case statement, there are two patterns that start with the same
line:

  when %r{/not_found}
    ...
  when %r{/not_found_original_exception}
    ...

Because the string "/not_found_original_exception" does match the first
one, it is never routed to what it is supposed to be routed, causing one
of the tests for DebugExceptions to happen to be passing.

After changing the regex expressions back to strings, I noticed that the
test setup is not complete (the template object needs to be a proper
template object). Once I fixed it all the tests started padding.

actionpack/test/dispatch/debug_exceptions_test.rb

@@ -39,52 +39,50 @@ def raise_nested_exceptions
     def call(env)
       env["action_dispatch.show_detailed_exceptions"] = @detailed
       req = ActionDispatch::Request.new(env)
+      template = ActionView::Template.new(File.read(__FILE__), __FILE__, ActionView::Template::Handlers::Raw.new, {})
+
       case req.path
-      when %r{/pass}
+      when "/pass"
         [404, { "X-Cascade" => "pass" }, self]
-      when %r{/not_found}
+      when "/not_found"
         raise AbstractController::ActionNotFound
-      when %r{/runtime_error}
+      when "/runtime_error"
         raise RuntimeError
-      when %r{/method_not_allowed}
+      when "/method_not_allowed"
         raise ActionController::MethodNotAllowed
-      when %r{/intercepted_error}
+      when "/intercepted_error"
         raise InterceptedErrorInstance
-      when %r{/unknown_http_method}
+      when "/unknown_http_method"
         raise ActionController::UnknownHttpMethod
-      when %r{/not_implemented}
+      when "/not_implemented"
         raise ActionController::NotImplemented
-      when %r{/unprocessable_entity}
+      when "/unprocessable_entity"
         raise ActionController::InvalidAuthenticityToken
-      when %r{/not_found_original_exception}
+      when "/not_found_original_exception"
         begin
           raise AbstractController::ActionNotFound.new
         rescue
-          raise ActionView::Template::Error.new("template")
+          raise ActionView::Template::Error.new(template)
         end
-      when %r{/missing_template}
+      when "/missing_template"
         raise ActionView::MissingTemplate.new(%w(foo), "foo/index", %w(foo), false, "mailer")
-      when %r{/bad_request}
+      when "/bad_request"
         raise ActionController::BadRequest
-      when %r{/missing_keys}
+      when "/missing_keys"
         raise ActionController::UrlGenerationError, "No route matches"
-      when %r{/parameter_missing}
+      when "/parameter_missing"
         raise ActionController::ParameterMissing, :missing_param_key
-      when %r{/original_syntax_error}
+      when "/original_syntax_error"
         eval "broke_syntax =" # `eval` need for raise native SyntaxError at runtime
-      when %r{/syntax_error_into_view}
+      when "/syntax_error_into_view"
         begin
           eval "broke_syntax ="
         rescue Exception
-          template = ActionView::Template.new(File.read(__FILE__),
-                                              __FILE__,
-                                              ActionView::Template::Handlers::Raw.new,
-                                              {})
           raise ActionView::Template::Error.new(template)
         end
-      when %r{/framework_raises}
+      when "/framework_raises"
         method_that_raises
-      when %r{/nested_exceptions}
+      when "/nested_exceptions"
         raise_nested_exceptions
       else
         raise "puke!"