The generated test cases for the function assuming another developer coded the function is given below in a C++ program.
<h3>THE CODE</h3>
#include <iostream>  
#include <iomanip>
#include <string>
using namespace std;
// define the data type "triangletype" with {values}
enum triangleType { scalene, isosceles, equilateral, noTriangle };
// Prototype function which returns the position of triangleType{value}
// Example: Scalene = 0, isosceles = 1, etc. These are zero indexed.
triangleType triangleShape(double a, double b, double c);
// Prototype function which takes the integer value of the 
// triangle type and outputs the name of triangle
string shapeAnswer(int value);
int main() {
    double inputA; 
    double inputB; 
    double inputC;
    cout << "To determine whether a triangle is either:" << endl;
    cout << setw(50) << " - Scalene" << endl; // Unequal in length
    cout << setw(52) << " - Isosceles" << endl; // Two sides equal length
    cout << setw(54) << " - Equilateral" << endl; // All sides equal
    cout << setw(57) << " - Not a triangle" << endl; 
    cout << "Enter side A: ";
    cin >> inputA;
    cout << "Enter side B: ";
    cin >> inputB;
    cout << "Enter side C: ";
    cin >> inputC;
    cout << "The triangle is " << shapeAnswer(triangleShape(inputA, inputB, inputC)) << endl;
}
triangleType triangleShape(double a, double b, double c) {
    triangleType answer;
    if ( c >= (a + b) || b >= (a + c) || a >= (b + c) ) {
        answer = noTriangle;
    }
    else if (a == b && b == c) {
        answer = equilateral;
    }
    // Test the 3 options for Isosceles equality
    else if ( (a == b) && (a != c) || (b == c) && (b != a) || (a == c) && (a != b) ) {
        answer = isosceles;
    }
    else {
        answer = scalene;
    }
    return answer;
}
string shapeAnswer(int value) {
    string answer;
    switch (value) {
    case 0:
        answer = "Scalene";
        break;
    case 1: 
        answer = "Isosceles";
        break;
    case 2:
        answer = "Equilateral";
        break;
    case 3:
        answer = "Not a triangle";
        break;
    default:
        break;
    }
    return answer;
}
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