Unit testing in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flutter test package.

Flutter

import 'package:flutter_test/[1]';

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

Aflutter_test.dart

Bflutter

Ctest

Dflutter_test

Attempts:

3 left

💡 Hint

Common Mistakes

Adding '.dart' extension in the import path.

Using 'test' package instead of 'flutter_test'.

The correct import for Flutter's testing package is 'flutter_test' without any file extension.

2fill in blank

medium

Complete the code to define a test case with description 'adds two numbers'.

Flutter

test('[1]', () {
  expect(1 + 1, 2);
});

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

Aadds two numbers

Btest addition

Ccheck addition

Dsum test

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different test description string.

Omitting the test description.

The test description should be 'adds two numbers' as specified.

3fill in blank

hard

Fix the error in the test to correctly check if the result equals 5.

Flutter

test('check result', () {
  var result = 2 + 3;
  expect(result, [1]);
});

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

AisEqualTo(5)

Bequals(5)

C5

DequalTo(5)

Attempts:

3 left

💡 Hint

Common Mistakes

Using matcher functions like equals(5) which are not needed here.

Passing a string instead of a number.

The expect function compares the actual value to the expected value directly, so just use 5.

4fill in blank

hard

Fill both blanks to create a test group named 'Math tests' with a test inside it.

Flutter

group('[1]', () {
  test('[2]', () {
    expect(2 * 2, 4);
  });
});

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

AMath tests

BMultiplication test

CAddition test

DMath group

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated group or test names.

Omitting the group or test description.

The group name is 'Math tests' and the test description is 'Multiplication test' as required.

5fill in blank

hard

Fill all three blanks to write a test that checks if a function 'add' returns 7 when adding 3 and 4.

Flutter

int [1](int a, int b) {
  return a + b;
}

test('[2]', () {
  expect([3](3, 4), 7);
});

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

Aadd

Badd function test

Dsum

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching function names in definition and call.

Using incorrect test description.

The function name is 'add', the test description is 'add function test', and the function call is 'add(3, 4)'.