Why testing is required in Go - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why is testing important in software development?

Choose the best reason why testing is important when writing software.

A To find and fix errors before users encounter them

B To make the program run faster

C To reduce the size of the program file

D To make the code look more complex

💡 Hint

Think about what happens if bugs are found after users start using the software.

Testing helps catch mistakes early so they can be fixed before the software reaches users, improving quality and reliability.

❓ Predict Output

intermediate

What is the output of this Go test function?

Look at this Go test code. What will it print when run?

Go

package main

import (
	"testing"
)

func Add(a, b int) int {
	return a + b
}

func TestAdd(t *testing.T) {
	result := Add(2, 3)
	if result != 5 {
		t.Errorf("Expected 5 but got %d", result)
	} else {
		println("Test passed")
	}
}

A Compilation error

B Expected 5 but got 6

C Test passed

D No output

💡 Hint

Check what the Add function returns and what the test expects.

The Add function returns 5 for inputs 2 and 3, so the test prints "Test passed".

❓ Predict Output

advanced

What error does this Go test produce?

What error message will this Go test produce when run?

Go

package main

import "testing"

func Divide(a, b int) int {
	return a / b
}

func TestDivide(t *testing.T) {
	_ = Divide(10, 0)
}

A Test passed with no errors

B No output

C Compilation error: missing return statement

D panic: runtime error: integer divide by zero

💡 Hint

Think about what happens when dividing by zero in Go.

Dividing by zero causes a runtime panic error in Go, stopping the program.

🧠 Conceptual

advanced

Which is NOT a benefit of testing?

Choose the option that is NOT a benefit of writing tests for your code.

A Improves code readability automatically

B Ensures code works as expected

C Helps catch bugs early

D Facilitates safe code changes

💡 Hint

Think about what testing can and cannot do for your code.

Testing helps find bugs and verify behavior but does not automatically improve how readable the code is.

🚀 Application

expert

How many test cases are run by this Go test suite?

Given this Go test code, how many test cases will run?

Go

package main

import "testing"

func IsEven(n int) bool {
	return n%2 == 0
}

func TestIsEven(t *testing.T) {
	tests := []struct {
		input int
		expect bool
	}{
		{2, true},
		{3, false},
		{0, true},
		{-4, true},
	}

	for _, test := range tests {
		if result := IsEven(test.input); result != test.expect {
			t.Errorf("For %d expected %v but got %v", test.input, test.expect, result)
		}
	}
}

A 2

B 4

C 0

D 1

💡 Hint

Count how many test cases are defined in the tests slice.

The tests slice contains 4 test cases, so the loop runs 4 times.