Application of Java function access modifiers in unit testing

In Java unit testing, the function access modifier is crucial: public: ensures that the test case can access the function. protected: Access is limited to classes in the same package or subclass. default: Access only to classes in the same package. private: Access restricted to the class in which they are defined.

Application of Java function access modifiers in unit testing

Access modifiers are crucial in Java , which controls the visibility and accessibility of functions. In unit testing, the correct use of these modifiers helps write efficient and maintainable test cases.

Access permission modifiers

There are four access permission modifiers in Java:

• public: In Accessible from anywhere
• protected: Access restricted to classes in the same package or subclass
• default (package-private): Limited to Access to classes in the same package
• private:Restricted to the class in which they are defined

##Application in unit testing

public to make it accessible to the test class. This ensures that the test case can call and verify the expected behavior of the function.

Practical case

Calculator class, which contains an add() function:

public class Calculator {

    private int add(int a, int b) {
        return a + b;
    }

}

add() function, we need to write a test class. To have accessibility, we need to place the test class in the same package as the Calculator class as follows:

import org.junit.jupiter.api.Test;

class CalculatorTest {

    @Test
    void testAdd() {
        Calculator calculator = new Calculator();
        int result = calculator.add(2, 3);
        assertEquals(5, result);
    }

}

public access permission modification character, we ensure that the CalculatorTest class can access the add() function and test it.

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