Test Case Generation | Set 1 (Random Numbers, Arrays and Matrices)

06 May, 2022
The test cases are an extremely important part of any “Software/Project Testing Process”. Hence this Set will be very important for all aspiring software developers. The following are the programs to generate test cases. 
Generating Random Numbers  
C++
Java
Python3
C#
Javascript
// A C++ Program to generate test cases for// random number#include<bits/stdc++.h>using namespace std; // Define the number of runs for the test data// generated#define RUN 5 // Define the range of the test data generated#define MAX 10000000 int main(){    // Uncomment the below line to store    // the test data in a file    // freopen("Test_Cases.in", "w", stdout);     // For random values every time    srand(time(NULL));     for (int i=1; i<=RUN; i++)        printf("%d\n", rand() % MAX);     // Uncomment the below line to store    // the test data in a file    //fclose(stdout);    return(0);}
// A Java Program to generate test cases// for random numberimport java.io.*;import java.util.Random; class GeneratingRandomNumbers{     // the number of runs    // for the test data generated    static int requiredNumbers = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // Driver Code    public static void main (String[] args) throws IOException    {        Random random = new Random();                 for(int i = 0; i < requiredNumbers; i++)        {            int a = random.nextInt(upperBound - lowerBound) +                                                lowerBound;            System.out.println(a);        }    }} // This code is contributed by Madfrost
# A Python3 Program to generate test cases# for random numberimport random # the number of runs# for the test data generatedrequiredNumbers = 5; # minimum range of random numberslowerBound = 0; # maximum range of random numbersupperBound = 1000; # Driver Codeif __name__ == '__main__':     for i in range(requiredNumbers):        a = random.randrange(0, upperBound -                    lowerBound) + lowerBound;        print(a); # This code is contributed by 29AjayKumar
// A C# Program to generate test cases// for random numberusing System; class GeneratingRandomNumbers{     // the number of runs    // for the test data generated    static int requiredNumbers = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // Driver Code    public static void Main(String[] args)    {        Random random = new Random();                 for(int i = 0; i < requiredNumbers; i++)        {            int a = random.Next(upperBound - lowerBound) +                                                lowerBound;            Console.WriteLine(a);        }    }} // This code is contributed by Rajput-Ji
<script> let requiredNumbers = 5;let lowerBound = 0;let upperBound = 1000; for(let i = 0; i < requiredNumbers; i++){    let a = Math.floor(Math.random() *    (upperBound - lowerBound)) + lowerBound;    document.write(a+"<br>");}  // This code is contributed by rag2127 </script>
Generating Random Arrays 
C++
Java
Python3
C#
Javascript
// A C++ Program to generate test cases for// array filled with random numbers#include<bits/stdc++.h>using namespace std; // Define the number of runs for the test data// generated#define RUN 5 // Define the range of the test data generated#define MAX 10000000 // Define the maximum number of array elements#define MAXNUM 100 int main(){    // Uncomment the below line to store    // the test data in a file    //freopen ("Test_Cases_Random_Array.in", "w", stdout);     //For random values every time    srand(time(NULL));     for (int i=1; i<=RUN; i++)    {        // Number of array elements        int NUM = 1 + rand() % MAXNUM;         // First print the number of array elements        printf("%d\n", NUM);         // Then print the array elements separated        // by space        for (int j=1; j<=NUM; j++)            printf("%d ", rand() % MAX);         printf("\n");    }     // Uncomment the below line to store    // the test data in a file    //fclose(stdout);    return(0);}
// A Java Program to generate test cases// for array filled with random numbersimport java.io.*;import java.util.Random; class GeneratingRandomArrays{     // the number of runs    // for the test data generated    static int RUN = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // minimum size of reqd array    static int minSize = 10;     // maximum size of reqd array    static int maxSize = 20;     // Driver Code    public static void main (String[] args) throws IOException    {        Random random = new Random();         for(int i = 0; i < RUN; i++)        {            int size = random.nextInt(maxSize - minSize) +                                                minSize;            int[] array = new int[size];             System.out.println(size);             for(int j = 0; j < size; j++)            {                int a = random.nextInt(upperBound - lowerBound) +                                                    lowerBound;                System.out.print(a + " ");            }            System.out.println();        }    }} // This code is contributed by Madfrost
# A Python3 Program to generate test cases# for array filled with random numbersimport random # the number of runs# for the test data generatedRUN = 5; # minimum range of random numberslowerBound = 0; # maximum range of random numbersupperBound = 1000; # minimum size of reqd arrayminSize = 10; # maximum size of reqd arraymaxSize = 20; # Driver Codeif __name__ == '__main__':     for i in range(RUN):        size = random.randrange(0, maxSize - minSize) + minSize;        array = [0]*size;         print(size);         for j in range(size):            a = random.randrange(0, upperBound - lowerBound) + lowerBound;            print(a, end=" ");         print();  # This code is contributed by 29AjayKumar
// A C# Program to generate test cases// for array filled with random numbersusing System; class GeneratingRandomArrays{     // the number of runs    // for the test data generated    static int RUN = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // minimum size of reqd array    static int minSize = 10;     // maximum size of reqd array    static int maxSize = 20;     // Driver Code    public static void Main(String[] args)    {        Random random = new Random();         for(int i = 0; i < RUN; i++)        {            int size = random.Next(maxSize - minSize) +                        minSize;            int[] array = new int[size];             Console.WriteLine(size);             for(int j = 0; j < size; j++)            {                int a = random.Next(upperBound - lowerBound) +                        lowerBound;                Console.Write(a + " ");            }            Console.WriteLine();        }    }} // This code is contributed by 29AjayKumar
<script> // A JavaScript Program to generate test cases// for array filled with random numbers // the number of runs// for the test data generatedlet RUN = 5; // minimum range of random numberslet lowerBound = 0; // maximum range of random numberslet upperBound = 1000; // minimum size of reqd arraylet minSize = 10; // maximum size of reqd arraylet maxSize = 20;  for(let i = 0; i < RUN; i++)        {            let size = Math.floor(Math.random() *            (maxSize - minSize)) + minSize;            let array = new Array(size);              document.write(size+"<br>");              for(let j = 0; j < size; j++)            {                let a =  Math.floor(Math.random() *                (upperBound - lowerBound)) +                 lowerBound;                document.write(a + " ");            }            document.write("<br>");        }  // This code is contributed by avanitrachhadiya2155 </script>
Generating Random Matrix  
C++
Java
Python3
C#
// A C++ Program to generate test cases for// matrix filled with random numbers#include<bits/stdc++.h>using namespace std; // Define the number of runs for the test data// generated#define RUN 3 // Define the range of the test data generated#define MAX 100000 // Define the maximum rows in matrix#define MAXROW 10 // Define the maximum columns in matrix#define MAXCOL 10 int main(){    // Uncomment the below line to store    // the test data in a file    // freopen ("Test_Cases_Random_Matrix.in", "w", stdout);     // For random values every time    srand(time(NULL));     for (int i=1; i<=RUN; i++)    {        // Number of rows and columns        int row = 1 + rand() % MAXROW;        int col = 1 + rand() % MAXCOL;         // First print the number of rows and columns        printf("%d %d\n", row, col);         // Then print the matrix        for (int j=1; j<=row; j++)        {            for (int k=1; k<=col; k++)                printf("%d ", rand() % MAX);            printf("\n");        }        printf("\n");    }     // Uncomment the below line to store    // the test data in a file    // fclose(stdout);    return(0);}
// A Java Program to generate test cases for// matrix filled with random numbersimport java.io.*;import java.util.Random; class GeneratingRandomMatrix{    // the number of runs    // for the test data generated    static int RUN = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // maximum size of column    static int maxColumn = 10;     // minimum size of column    static int minColumn = 1;     // minimum size of row    static int minRow = 1;     // maximum size of row    static int maxRow = 10;     // Driver Code    public static void main (String[] args) throws IOException    {        Random random = new Random();         for(int i = 0; i < RUN; i++)        {            int row = random.nextInt(maxRow - minRow) +                                              minRow;            int column = random.nextInt(maxColumn - minColumn) +                                                    minColumn;             int[][] matrix = new int[row][column];             System.out.println(row + " " + column);             for(int j = 0; j < row; j++)            {                for(int k = 0; k < column; k++)                {                    int a = random.nextInt(upperBound - lowerBound) +                                                        lowerBound;                    System.out.print(a + " ");                }                System.out.println();            }            System.out.println();        }    }} // This code is contributed by Madfrost
# A Python3 Program to generate test cases# for matrix filled with random numbersimport random # the number of runs# for the test data generatedRUN = 5; # minimum range of random numberslowerBound = 0; # maximum range of random numbersupperBound = 1000; # maximum size of columnmaxColumn = 10; # minimum size of columnminColumn = 1; # minimum size of rowminRow = 1; # maximum size of rowmaxRow = 10;     # Driver Codeif __name__ == '__main__':         for i in range(RUN):        row = random.randrange(0, maxRow - minRow) + minRow                 column = random.randrange(0, maxColumn - minColumn) + minColumn                 matrix = [[0 for i in range(column)] for j in range(row)]                 print(row, column)                 for j in range(row):            for k in range(column):                a = random.randrange(0, upperBound - lowerBound) +  lowerBound                print(a ,end = " ")            print()        print()         # This code is contributed by Shubham Singh
// A C# Program to generate test cases for// matrix filled with random numbersusing System; public class GeneratingRandomMatrix{    // the number of runs    // for the test data generated    static int RUN = 5;     // minimum range of random numbers    static int lowerBound = 0;     // maximum range of random numbers    static int upperBound = 1000;     // maximum size of column    static int maxColumn = 10;     // minimum size of column    static int minColumn = 1;     // minimum size of row    static int minRow = 1;     // maximum size of row    static int maxRow = 10;     // Driver Code    public static void Main(String[] args)    {        Random random = new Random();         for(int i = 0; i < RUN; i++)        {            int row = random.Next(maxRow - minRow) +                                            minRow;            int column = random.Next(maxColumn - minColumn) +                                                    minColumn;             int[,] matrix = new int[row, column];             Console.WriteLine(row + " " + column);             for(int j = 0; j < row; j++)            {                for(int k = 0; k < column; k++)                {                    int a = random.Next(upperBound - lowerBound) +                                                        lowerBound;                    Console.Write(a + " ");                }                Console.WriteLine();            }            Console.WriteLine();        }    }} // This code is contributed by 29AjayKumar
 
rand() Function– -> Generate random numbers from the range 0 to RAND_MAX (32767) -> Defined in <stdlib.h>/<cstdlib> header -> If we want to assign a random number in the range – m to n [n >= m] to a variable var, then use-var = m + ( rand() % ( n – m + 1 ) ); -> This function is a run-time function. So the values – n, m must be declared before compiling just like we have to declare the size of array before compiling. -> Call this function every time you want to generate a random numbertime() Function -> Return the number of seconds from [00:00:00 UTC, January 1, 1970] -> Defined in <time.h> headersrand(seed) -> Generates random number according to the seed passed to it. -> If this function is not used and we use rand() function then every time we run the program the same random numbers gets generated. -> To overcome the above limitation, we pass time(NULL) as a seed. Hence srand(time(NULL)) is used to generate random values every time the program is made to run. -> Always use this at the beginning of the program, i.e- just after int main() { -> No need to call this function every time you generate a random number -> Defined in <stdlib.h>/<cstdlib> headerfreopen(“output.txt”, “w”, stdout) -> Writes (that’s why we passed “w” as the second argument) all the data to output.txt file (The file must be in the same file as the program is in). -> Used to redirect stdout to a file. -> If the output.txt file is not created before then it gets created in the same file as the program is in.fclose(stdout) -> Closes the standard output stream file to avoid leaks. -> Always use this at the end of the program, i.e- just before return(0) in the int main() function.
rand() Function– -> Generate random numbers from the range 0 to RAND_MAX (32767) -> Defined in <stdlib.h>/<cstdlib> header -> If we want to assign a random number in the range – m to n [n >= m] to a variable var, then use-var = m + ( rand() % ( n – m + 1 ) ); -> This function is a run-time function. So the values – n, m must be declared before compiling just like we have to declare the size of array before compiling. -> Call this function every time you want to generate a random number
time() Function -> Return the number of seconds from [00:00:00 UTC, January 1, 1970] -> Defined in <time.h> header
srand(seed) -> Generates random number according to the seed passed to it. -> If this function is not used and we use rand() function then every time we run the program the same random numbers gets generated. -> To overcome the above limitation, we pass time(NULL) as a seed. Hence srand(time(NULL)) is used to generate random values every time the program is made to run. -> Always use this at the beginning of the program, i.e- just after int main() { -> No need to call this function every time you generate a random number -> Defined in <stdlib.h>/<cstdlib> header
freopen(“output.txt”, “w”, stdout) -> Writes (that’s why we passed “w” as the second argument) all the data to output.txt file (The file must be in the same file as the program is in). -> Used to redirect stdout to a file. -> If the output.txt file is not created before then it gets created in the same file as the program is in.
fclose(stdout) -> Closes the standard output stream file to avoid leaks. -> Always use this at the end of the program, i.e- just before return(0) in the int main() function.
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Madfrost
Rajput-Ji
29AjayKumar
rag2127
avanitrachhadiya2155
surindertarika1234
SHUBHAMSINGH10
simmytarika5
Competitive Programming
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