CODEWITHSUNDEEP
grailsgroovyspock
Matt Westlake
Matt Westlake

Reputation: 3651

how do you mock out methods from the class you're testing in spock

I have a method I want to test in my site

public boolean syncUser(username, password){
    if (getUserFromDB(username)){
            // do work
            return true
    }
    return false
}

How do I test syncUser and stub/mock out getUserFromDB?

I've tried everything including

_ * _.getUserFromDB(*_) >> true

But it keeps trying to hit the method instead of using the return value. The test case is as follows:

void "successfulSyncUser"(){
    given:
    _ * _.getUserFromDB(*_) >> true

    when:
    def syncUserResult = userManagement.syncUser(username, password)

    then:
    syncGuidResult == true
}

Upvotes: 1

Views: 1764

Answers (1)

saw303
saw303

Reputation: 9072

You only can use this statements on mocks.

 _ * _.getUserFromDB(*_) >> true

That means you would have to first use 

def mock = Mock(YourClass)

In your case getUserFromDB and syncUser belong to the same class. In that case you cannot use mocks.

Here is want you can do. You can use the Groovys Metaclass to override the implementation of your current UserManagement instance.

void "successfulSyncUser"(){
    given:
    userManagement.metaClass.getUserFromDB = { param1 -> return true }

    when:
    def syncUserResult = userManagement.syncUser(username, password)

    then:
    syncGuidResult == true
}

Please find a simple example how to override existing methods using Groovy Magic :)

class Person {    
    String sayHello() { 'Foo' }
}

def a = new Person()
def b = new Person()

println a.sayHello()
println b.sayHello()

a.metaClass.sayHello = { 'Bar' }

println a.sayHello()
println b.sayHello()

This will result in the following output:

Foo
Foo
Bar
Foo

Upvotes: 1

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