Why testing matters in Kotlin - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a test message.

Kotlin

fun main() {
    println([1])
}

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

A"Test passed!"

BTest passed!

Cprintln("Test passed!")

Dpass

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the string.

Trying to print without using println.

The println function prints the string inside quotes. We need quotes around the message.

2fill in blank

medium

Complete the code to check if a test result is true.

Kotlin

fun isTestSuccessful(result: Boolean): Boolean {
    return result [1] true
}

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

A=>

B=

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using single equals instead of double equals for comparison.

Using wrong comparison operators.

Use == to compare values in Kotlin. A single = is for assignment.

3fill in blank

hard

Fix the error in the test function to return the correct message.

Kotlin

fun testMessage(passed: Boolean): String {
    return if (passed) [1] else "Test failed"
}

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

Aprintln("Test passed")

B"Test passed"

CTest passed

Dpassed

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a print statement instead of a string.

Forgetting quotes around the string.

The function must return a string. So the true branch needs a string literal with quotes.

4fill in blank

hard

Fill both blanks to create a list of test results and check if all passed.

Kotlin

val results = listOf([1], [2], false)
val allPassed = results.all { it }
println(allPassed)

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

Atrue

Bfalse

C1

D"passed"

Attempts:

3 left

💡 Hint

Common Mistakes

Using numbers or strings instead of Booleans in the list.

Confusing true and false values.

The list should contain Boolean values. Using true twice and false once creates a mixed result.

5fill in blank

hard

Fill all three blanks to create a map of test names to results and filter passed tests.

Kotlin

val testResults = mapOf([1] to [2], "test2" to false, "test3" to true)
val passedTests = testResults.filter { it.value [3] true }
println(passedTests.keys)

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

A"test1"

Btrue

C==

D"passed"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of Booleans for test results.

Using wrong comparison operators in filter.

The map needs a string key and a Boolean value. The filter checks if the value equals true.