Ошибка при работе с gradle(junit), InteliJ Idea

Ошибка:

 Task :test FAILED FAILURE: Build failed with an exception.
 What went wrong: Execution failed for task ':test'.
 No tests found for given includes: [CalculatorTest](filter.includeTestsMatching) 

Это Java 11.

Вот сам код:

public class Calculator {
    public int add(int a, int b){
        return a+b;
    }
}

import org.junit.Test;

import static org.junit.Assert.*;

public class CalculatorTest {

    @Test
    public void add() {
        Calculator calculator = new Calculator();
        double expected = 15;
        double result = calculator.add(10,5);
        assertEquals(expected, result, 0.001);
        double expected2 = 150;
        double result2 = calculator.add(100,50);
        assertEquals(expected2, result2, 0.001);
    }
}