Testing the Go model - json

Question

So this is one of my Go models:
type ObjectReference struct {
IRI string `json:"iri" bson:"iri"`
ObjectType string `json:"objectType" bson:"objectType,omitempty"`
ActivityType string `json:"activityType,omitempty" bson:"activityType,omitempty"`
Errors `bson:"-"`
}
I have a validation on the ActivityType as:
objTypeSuccess := o.ObjectType == "activity"
success = success && objTypeSuccess
if (!objTypeSuccess) {
o.errors = append(o.errors, "Object objectType supplied : " + o.ObjectType + " is invalid. Valid object types are : [activity]")
}
where
o *ObjectReference is in the func() definition
I am trying to write a test as so:
testObj = models.ObjectReference{
// Invalid Obj Type
IRI: "http://localhost:8001/launched",
ObjectType: ????,
ActivityType: testObjType,
}
I don't quite understand how I could initialize the ObjectType in my testObj. Can someone help me with this?

Answer 1

The ObjectReference.ObjectType is a field of type string. That being said you can initialize it with an expression of type string. The most basic/simple expression of type string is a string literal such as "hello".
Since in your test code you compare it to the value "activity", I assume that is what you want to initialize it with. You can do that like this:
testObj = models.ObjectReference{
IRI: "http://localhost:8001/launched",
ObjectType: "activity",
ActivityType: testObjType,
}
But of course you can specify any other values/expressions of type stirng:
testObj = models.ObjectReference{
IRI: "http://localhost:8001/launched",
ObjectType: "NOT-AN-ACTIVITY",
ActivityType: testObjType,
}