Write tests for the followingYour tests must be written using JUnit $5.$

~Product Class

$*$ Constructing a Product with a negative price

$*$ Getting and setting negative prices $*$ equals$()$

$*$ todString$()$

public class Product $\{$ private String sku;$$ private double unitPrice;$$ private String description;$/***$ Represents a Product with a SKU number, unit price, and description.$**$ @param sku$*$ @param unitPrice must be non$-$negative$*$ @param description$*/$ public Product$($String sku, double unitPrice, String description$)\{$ if $($unitPrice $<0)\{$ throw new IllegalArgumentException$("$Unit price must be non$-$negative."$)$;$\}$ this.sku $=$ sku;$$ this.unitPrice $=$ unitPrice;$$ this.description $=$ description;$\}/***$ Returns the unit price$*$ @return unit price$*/$ public double getUnitPrice$()\{$ return unitPrice;$\}/***$ Sets the unit price$*$ @param unitPrice must be non$-$negative$*/$ public void setUnitPrice$($double unitPrice$)\{$ if $($unitPrice $<0)\{$ throw new IllegalArgumentException$("$Unit price must be non$-$negative."$)$;$\}$ this.unitPrice $=$ unitPrice;$\}/***$ Returns the description$*$ @return the description$*/$ public String getDescription$()\{$ return description;$\}/***$ Sets the description$*$ @param description$*/$ public void setDescription$($String description$)\{$ this.description $=$ description;$\}/***$ Returns the SKU number$*$ @return the SKU number$*/$ public String getSku$()\{$ return sku;$\}$ @Override$$ public String toString$()\{$ return "Product $[$sku$="+$ sku $+",$ unitPrice$="+$ unitPrice $+",$ description$="+$ description $+"]"$;$\}/***$ Products are equal $*$only$*$ if their sku numbers are equal$*$ @see java.lang.Object#equals$($java$.$lang.Object$)*/$ @Override$$ public boolean equals$($Object obj$)\{$ if $($this $==$ obj$)$ return true;$$ if $($obj $==$ null$)$ return false;$$ if $($getClass$()!=$ obj.getClass$())$ return false;$$ Product other $=($Product$)$ obj;$$ if $($sku $==$ null$)\{$ if $($other$.$sku $!=$ null$)$ return false;$\}$ else if $(!$sku.equals$($other$.$sku$))$ return false;$$ return true;$\}\}$