Writing test for all functions.

person-all-public.js

/**
 * @param firstName
 * @param lastName
 * @param address
 * @constructor
 */
function Person(firstName, lastName, address) {
    let self = this;
    this.firstName = firstName;
    this.lastName = lastName;
    this.address = address;

    /**
     * @return {string}
     */
    this.getAddress  = function()  {
        return _.get(self.address, ['city']) + '(' + _.get(self.address, ['country']) + ')';
    }

    /**
     * @return {string}
     */
    this.getFullName = function() {
        return self.firstName + ' ' + self.lastName;
    }

    /**
     * @return {string}
     */
    this.getInfo = function() {
        return 'His name is ' + self.getFullName() + ' and lives in ' + self.getAddress();
    };
}


// Person.spec.js

describe('Testing  Person ', function() {
    var person;
    beforeEach(function() {
        person = new Person('Imdadul', 'Huq', { country: 'Germany', city: 'Darmstadt' });
    })
    describe('Test of getInfo', function() {
        beforeEach(function() {
           spyOn(person, 'getFullName').and.callFake(function() {
               return 'abraka-dabra';
           });
           spyOn(person, 'getAddress').and.callFake(function() {
               return 'no-where';
           });
        });
        expect(person.getInfo()).toEqual('His name is abraka-dabra and lives in no-where');
    });

    describe('Test of getFullName', function() {
        expect(person.getFullName()).toEqual('Imdadul Huq');
    });

    describe('Test of getFullName', function() {
        expect(person.getAddress()).toEqual('Darmstadt(Germany)');
    });
});