I have the following function:
public static String s(B b) {
int t = b.t();
String r ="Hello ";
for(String z:s) {
boolean x=b.f(t,5);
if(x) {
r+=z;
}
}
return r;
}
Which takes in B - Interface
The Interface B - Methods int t() and boolean f(int a, int b) were implemented in the same class within main as the following:
public static void main(String[] args) {
A.s(new B() { //A - Class
@Override //B - Interface
public int t() {
return 15;
}
@Override
public boolean f(int a, int b) {
return true;
}
});
}
Issue: How can i test the public static String s(B b) - function from a jUnit - test when the function asks for a interface as a parameter, when the interface methods were implemented in main?
The Class is called A, Interface: B
When you want to test your s() method you can provide any reference to an object which implements the B interface. You can define an anonymous class which implements the interface as you did in your main() method. Or you can define a "normal" class which implements the interface as well. So you can write something like this:
public class Whatever implements B
{
/* your methods from B */
}
Then you use this class like any other class inside your unit test:
@Test
public void checkSomething() {
String result = A.s(new Whatever());
Assertions.assertEquals("my string", result);
}