rego_type_error: undefined function - unit-testing

Question

I am new to OPA and rego files. I have created a rego file like this :
package sample.access
import data.myaccess
default allow = false
allow = true {
myaccess.is_user_allowed(input.user)
}
And, I have created test rego file like this :
package sample.access
test_allow_positive{
allow with input as {
"user": "user1"
} with data.myaccess as {
{
{"user": "user1"},
{"user": "user2"}
}
}
}
When I run this test case, I am getting error like "rego_type_error: undefined function data.myaccess.is_user_allowed". Help me to fix this. Thanks

Answer 1

I assume this is what you are trying to do:
Create a rule, allow, which returns true if input.user is from a set of users passed at the call time. To do this, you can use the rule:
package sample.access
allow {
data.allowed[input.user]
}
The corresponding unit tests:
package sample.access
test_allow {
allow with input as {
"user": "user1"
} with data.allowed as {"user1", "user2"}
}
test_deny {
not allow with input as {
"user": "user3"
} with data.allowed as {"user1", "user2"}
}
Note that you do not need to explicitly import parameters which you will pass at runtime.
If your input data is required to be in the form of a list of {"user": "id"}, then instead you should use a set comprehension.
package sample.access
allow {
is_user_allowed = {user | user = data.allowed[_].user}
is_user_allowed[input.user]
}
Your unit tests would then need to be amended as such:
package sample.access
test_allow {
allow with input as {
"user": "user1"
} with data.allowed as {
{"user": "user1"},
{"user": "user2"}
}
}
test_deny {
not allow with input as {
"user": "user3"
} with data.allowed as {
{"user": "user1"},
{"user": "user2"}
}
}