Writing basic test functions in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a basic test function in Go.

Go

func TestAddition(t *[1]) {
    // test code here
}

Drag options to blanks, or click blank then click option'

Atesting.T

Btesting

CTest

DTestT

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong parameter type like 'Test' or 'testing' instead of '*testing.T'.

Forgetting the pointer '*' before 'testing.T'.

The parameter for a test function in Go must be *testing.T to access test methods.

2fill in blank

medium

Complete the code to fail the test if the sum is incorrect.

Go

func TestSum(t *testing.T) {
    result := 2 + 2
    if result != 4 {
        t.[1]("Sum is incorrect")
    }
}

Drag options to blanks, or click blank then click option'

AFailNow

BErrorf

CError

DFail

Attempts:

3 left

💡 Hint

Common Mistakes

Using Fail or FailNow without a message.

Using Error which does not accept formatting.

t.Errorf reports an error but continues the test. It's commonly used to show failure messages.

3fill in blank

hard

Fix the error in the test function declaration.

Go

func [1](t *testing.T) {
    product := 3 * 3
    if product != 9 {
        t.Errorf("Product is wrong")
    }
}

Drag options to blanks, or click blank then click option'

ATest_Multiply

BtestMultiply

CTestmultiply

DTestMultiply

Attempts:

3 left

💡 Hint

Common Mistakes

Starting the function name with lowercase 'test'.

Using underscores or incorrect capitalization.

Test functions must start with 'Test' and be exported (capitalized) to run automatically.

4fill in blank

hard

Fill both blanks to check if the function returns the expected value and fail the test if not.

Go

func TestSubtract(t *testing.T) {
    result := subtract(5, 3)
    if result [1] 2 {
        t.[2]("Expected 2 but got different value")
    }
}

Drag options to blanks, or click blank then click option'

A!=

B==

CErrorf

DFailNow

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '!=' in the condition.

Using 'FailNow' which stops the test immediately without message.

We check if the result is not equal to 2 using '!=' and report an error with t.Errorf.

5fill in blank

hard

Fill all three blanks to write a test that checks if the function returns true and fails the test if false.

Go

func TestIsEven(t *testing.T) {
    if ![1](4) {
        t.[2]("4 should be even")
        t.[3]()
    }
}

Drag options to blanks, or click blank then click option'

AisEven

BErrorf

CFailNow

DIsEven

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'IsEven' instead of 'isEven' if the function is lowercase.

Not calling t.FailNow() after reporting the error.

The function isEven is called to check 4. If false, t.Errorf reports the error and t.FailNow stops the test immediately.