How can I improve my tests using PageObject pattern?

I think I already get the gist of the PageObject pattern but there are some parts of it that I didn't get.

So I was following this tutorial and now I have this Page class:

public class SignUpPage extends AbstractPage {

    AndroidDriver<MobileElement> driver;

    public SignUpPage(AndroidDriver<MobileElement> driver) {
        super(driver);
    }

    public void signUpAllFieldsEmpty() {
        signup_button.click();
    }

    public void signUpOnlyFirstName() {
        first_name_edittext.sendKeys("First name");
        hideKeyboard();
        signup_button.click();
    }


    @AndroidFindBy(id="signup_button")
    private MobileElement signup_button;

    @AndroidFindBy(id="first_name_edittext")
    private MobileElement first_name_edittext;

    @AndroidFindBy(id="last_name_edittext")
    private MobileElement last_name_edittext;

    @AndroidFindBy(id="signup_email_edittext")
    private MobileElement signup_email_edittext;

    @AndroidFindBy(id="signup_password_edittext")
    private MobileElement signup_password_edittext;

    @AndroidFindBy(id="confirm_password_edittext")
    private MobileElement confirm_password_edittext;

}

Then I have this Test class:

public class Test_001_SignUp extends AbstractTest {

    public Test_001_SignUp() {}

    @Test
    public void signUp_allFieldsEmpty() {

        app.landingPage().goToSignUpPage();        
        app.signUpPage().signUpAllFieldsEmpty();

    }

    @Test
    public void signUp_onlyFirstName() {

        app.signUpPage().signUpOnlyFirstName();

    }

}

I am not sure if I am doing it right because it looks like the method in the test class becomes redundant if I create another @Test method that will be relevant to the test.

How could I improve this? Or am I doing something wrong with this test?