Created a new fuzz example

examples/fuzzing/calculator_test.go

@@ -1,79 +1,88 @@
 package main
 
-/* Fuzz testing or fuzzing is an automated software testing method
-that injects invalid, malformed, or unexpected inputs into a system
-to reveal software defects and vulnerabilities.
-A fuzzing tool injects these inputs into the system and then monitors for exceptions such as crashes or information leakage
-*/
-
-//A simple way of using fuzzing to test a program using a claculator instance
 import (
+	"bytes"
 	"errors"
-	"fmt"
+	"math/rand"
+	"strconv"
 	"testing"
 )
 
 /*A calculator for performing simple arithmetic operations*/
-func calculator(num1, num2 float64, operator string) (float64, error) {
-	var result float64
 
+/*
+[]byte was used as its parameters in the Calculator() cause fuzz test  requires []bytes as
+ it parameters when testing a function
+ then the []bytes are coverted to []float for performing arithmetic operations
+*/
+
+func Calculator(numbers []byte) (float64, error) {
+	bytesList := bytes.Split(numbers, []byte(","))
+
+	//convert to float
+	var floatList []float64
+	for _, b := range bytesList {
+		f, err := strconv.ParseFloat(string(b), 64)
+		if err != nil {
+			return 0, err
+		}
+		floatList = append(floatList, f)
+	}
+
+	var result float64
+	var operator string
+
+	//performing calculations based on the indices of the values in FloatList
 	switch operator {
 	case "-":
-		result = num1 - num2
+		if floatList[0] > floatList[1] || floatList[0] < floatList[1] {
+			result = floatList[0] - floatList[1]
+			return result, nil
+		} else if floatList[1] > floatList[0] || floatList[1] < floatList[0] {
+			result = floatList[1] - floatList[0]
+			return result, nil
+		}
 
 	case "+":
-		result = num1 + num2
+		if floatList[0] > floatList[1] || floatList[0] < floatList[1] {
+			result = floatList[0] + floatList[1]
+			return result, nil
+		} else if floatList[1] > floatList[0] || floatList[1] < floatList[0] {
+			result = floatList[1] + floatList[0]
+			return result, nil
+		}
 
 	case "/":
-		if num2 == 0 || num1 == 0 {
+		if floatList[0] == 0 || floatList[1] == 0 {
 			return 0, errors.New("Division by 0")
 		}
+		result = floatList[0] / floatList[1]
+
 	case "*":
-		result = num1 * num2
+		result = floatList[0] * floatList[1]
 	}
 
 	return result, nil
 }
 
-/*Accepts inputs, calls the calculator function and executes inputs and return results*/
-func InputCalculator(data float64) float64 {
-	inputcases := []struct {
-		input1   float64
-		input2   float64
-		operator string
-		output   float64
-	}{
-		{1, 3, "+", 4},
-		{4, 6, "-", -2},
-		{0, 0, "/", 0},
-		{9, 2, "*", 18},
-		{1.2, 2.4, "*", 2.88},
-		{2, 6, "+", 9},
+func FuzzCalculator(f *testing.F) {
+	//generate random numbers btwn 0-100
+	testcases := []float64{rand.Float64() * 100, rand.Float64() * 100}
+
+	//convert to bytes
+	var b []byte
+	for _, n := range testcases {
+		b = strconv.AppendFloat(b, n, 'f', -1, 64)
+		b = append(b, ',')
 	}
-	success := 1
-	for _, input := range inputcases {
-		result, _ := calculator(input.input1, input.input2, input.operator)
-		if result != input.output {
-			fmt.Errorf("Calculator(%f,%f,%s)=%f; expected %f", input.input1, input.input2,
-				input.operator, result, input.output)
+	f.Add(b) //seed corpus inputs performed
+
+	//Runs the fuzz function for testing
+	f.Fuzz(func(t *testing.T, numbers []byte) {
+		_, err := Calculator(numbers)
+		if err != nil {
+			return
 		}
-		return result
-	}
-	return float64(success)
-
-}
-
-// testing the Calculator inputs function
-func FuzzTestInput(f *testing.F) {
-	f.Fuzz(func(t *testing.T, data float64) {
-		_ = InputCalculator(data)
-	})
-
-}
-
-// Tests the calculator function
-func FuzzTestCalculator(f *testing.F) {
-	f.Fuzz(func(t *testing.T, num1, num2 float64, operator string) {
-		_, _ = calculator(num1, num2, operator)
+		t.Log("Calculations Test Passed")
 	})
 }