java_upgrade/src/test/java/optional/CompanyTest.java at main · MikeLaptev/java_upgrade · GitHub

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package optional;

import org.junit.jupiter.api.Test;

import java.util.Optional;

import static org.junit.jupiter.api.Assertions.*;

class CompanyTest {

private final Company company = new Company("MyCo");

@Test

void getDepartmentWithManager() {

Optional<Department> dept = company.getDepartment("Accounting");

assertTrue(dept.isPresent());

Department department = dept.orElseThrow();

System.out.println(department.getName());

System.out.println(department.getManager());

System.out.println(department.getOptionalManager());

}

@Test

void getDepartmentWithoutManager() {

Optional<Department> dept = company.getDepartment("IT");

assertTrue(dept.isPresent());

Department department = dept.orElseThrow();

System.out.println(department.getName());

System.out.println(department.getManager());

System.out.println(department.getOptionalManager());

}

@Test

void getOptionalDepartment() {

Optional<Department> optionalDept = company.getDepartment("Whatever");

System.out.println(optionalDept.map(Department::getManager));

System.out.println(optionalDept.map(Department::getOptionalManager));

System.out.println(optionalDept.flatMap(Department::getOptionalManager));

}

@Test

void getOptionalDepartmentWithManager() {

Optional<Department> optionalDept = company.getDepartment("Finance");

System.out.println(optionalDept.map(Department::getManager));

System.out.println(optionalDept.map(Department::getOptionalManager));

System.out.println(optionalDept.flatMap(Department::getOptionalManager));

}

java_upgrade/src/test/java/optional/CompanyTest.java at main · MikeLaptev/java_upgrade · GitHub

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