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hello everybody

I need to write a Junit for a class that find a squre equation:

the code:

```import java.util.Scanner;

public class SquareEquation {
private static boolean ans = true;

public static void main(String[] args) {
sqEquation();
}
public static void sqEquation(){

while (ans==true) {

double a;
double b;
double c;

System.out.println("aX^2+bX+c=0: Enter a,b,c:");
System.out.print("Enter a:");
Scanner s = new Scanner(System.in);
a = s.nextDouble();
System.out.print("Enter b:");
Scanner y = new Scanner(System.in);
b = y.nextDouble();
System.out.print("Enter c:");
Scanner z = new Scanner(System.in);
c = z.nextDouble();

sqEq(a,b,c);
}
System.out.println("bye bye");
}
public static void sqEq(double a, double b, double c) {

double x1 = (-b + Math.sqrt(b*b-4*a*c))/(2*a);
double x2 = (-b - Math.sqrt(b*b-4*a*c))/(2*a);

if((b*b-4*a*c)>0) {
System.out.println("x1: "+ x1+"  "+"x2:" +x2);
continuegame();
}

else if((b*b-4*a*c)==0 && checkabc(a,b,c)) {
System.out.println("x1=x2="+x1);
System.out.println(a+"X^2"+"+"+b+"X"+"+"+c+"=0");
continuegame();
}

else {
try {
if((b*b-4*a*c)<0) {
throw new SquareEquationException ("Error: NO real roots!");
}
if(a==0&&b==0&&c==0) {
throw new SquareEquationException ("x can be any number - trivial");
}
if(a==0&&b==0&&c!=0) {
throw new SquareEquationException ("Error, no answer!");
}

}
catch (SquareEquationException e) {
e.printStackTrace();
}

finally {
continuegame();
}

}
}

public static boolean continuegame () {
System.out.println("Enter 0 or any number to Exit or 1 to solve aX^2+bX+c=0");
Scanner f = new Scanner(System.in);
int k;
k = f.nextInt();
if (k==1) {
ans=true;
return ans;
}
else {
ans=false;
return ans;
}
}

public static boolean checkabc (double a, double b, double c) {
if(a==0&&b==0&&c==0) {
return false;
}
if(a==0&&b==0&&c!=0) {
return false;
}
else {
return true;
}

}

}```

how can I write a Junit to this class? that check
1. the option that I have 2 solutions
2. the options that I have a solution
3. the option that I don't have any solution

I don't success to do it..

thank you!!

What I have tried:

I try to do Junit to this class and I don't success with assertequals and with syntax of junit for exception and I need some example that working////
Posted
Comments
[no name] 7-Apr-19 21:16pm
You said you "tried" ... then show what you tried. There is no free lunch.

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