MobilePhoneNoFeatureEnvy test

This code has no smells. It is correction of MobilePhoneWithFeatureEnvy test case.

Expected refactorings

Member	Move to
-	-

package mobilePhoneNoFeatureEnvy;

public class Customer {
    private Phone mobilePhone;

    public String getMobilePhoneNumber() {
        return mobilePhone.toFormattedString();
    }
}

package mobilePhoneNoFeatureEnvy;

public class Phone {
    private final String unformattedNumber;

    public Phone(String unformattedNumber) {
        this.unformattedNumber = unformattedNumber;
    }

    private String getAreaCode() {
        return unformattedNumber.substring(0, 3);
    }

    private String getPrefix() {
        return unformattedNumber.substring(3, 6);
    }

    private String getNumber() {
        return unformattedNumber.substring(6, 10);
    }

    public String toFormattedString() {
        return "(" + getAreaCode() + ") " + getPrefix() + "-" + getNumber();
    }
}