问题
Specs2's documentation and samples show some codes about the use of Given/Then/When style in an acceptance test.
Here one of them:
"A given-when-then example for the addition" ^
"Given the following number: ${1}" ^ number1 ^
"And a second number: ${2}" ^ number2 ^
"And a third number: ${3}" ^ number3
val number1: Given[Int] = (_:String).toInt
val number2: When[Int, (Int, Int)] = (n1: Int) => (s: String) => (n1, s.toInt)
val number3: When[Seq[Int], Seq[Int]] = (numbers: Seq[Int]) => (s: String) => numbers :+ s.toInt
However, it only deal with some primitive objects as Int
here (normal since it's a sample).
But how to deal with complex objects? Using Datatables
?
Ideal would be to define, within some file of "fixtures", datatables (or similar things) defining complex objects.
External datatable defining the User
"Mik"
"name" | "job" | "e-mail"
"mik" | "engineer" | "mik@mik.com"
I would like to create a Given statement like this one:
"Given the following user: ${Mik}" ^ retrieve_user_from_database ^
val user: Given[User] = .....Some ideal codes here to map Mik's values to User model.
What is a good practice and what does Specs2 currently provide?
回答1:
If you want to retrieve a user from an existing database, you can do the following:
"Given the following user: ${Mik}" ^ user ^
val user: Given[User] = (name: String) => database.getUserByName(name)
Now you might want to populate your database with users before doing that. One possibility is indeed to use Datatables:
def populateDatabase =
"name" || "job" | "e-mail" |
"mik" !! "engineer" ! "mik@mik.com" |
"eric" !! "engineer" ! "eric@eric.com" | { (name, job, email) =>
database.saveUser(User(name, job, email)) must not(throwAn[Exception])
}
and put this in a Step
before your G/W/T group:
Step(populateDatabase) ^
"Given the following user: ${Mik}" ^ user ^
"This user should be an ${engineer} ^ jobOk ^
end
val user: Given[User] = (name: String) => database.getUserByName(name)
val jobOk: Then[User] = (user: User) => (job: String) => user.job must_== job
来源:https://stackoverflow.com/questions/14507098/specs2-how-to-define-complex-objects-for-given-when-then-steps