Unit testing services in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mock the service dependency in a unit test.

Microservices

mock_service = [1]('UserService')

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ASpy

BStub

CFake

DMock

Attempts:

3 left

💡 Hint

Common Mistakes

Using Stub instead of Mock, which is less flexible for verifying interactions.

We use Mock to create a mock object for the service dependency in unit tests.

2fill in blank

medium

Complete the code to assert the service method was called once.

Microservices

mock_service.[1].assert_called_once()

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Asome_method

Bprocess

Cexecute

Dfetch_data

Attempts:

3 left

💡 Hint

Common Mistakes

Using generic names like 'execute' or 'process' that do not match the actual method.

You must specify the exact method name you expect to be called. Here, some_method is the service method being tested.

3fill in blank

hard

Fix the error in the test setup to correctly patch the service.

Microservices

with patch('[1].UserService') as mock_service:

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Aservice_layer

Bservice

Cservices

DserviceLayer

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect module names that cause patch to fail.

The patch target must match the exact import path. Here, services is the correct module name containing UserService.

4fill in blank

hard

Fill both blanks to create a test that mocks a service method and sets its return value.

Microservices

mock_service.[1].return_value = [2]

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Aget_user

B{'id': 1, 'name': 'Alice'}

Cfetch_data

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Setting return_value to None or wrong method names.

We mock the get_user method and set its return value to a sample user dictionary.

5fill in blank

hard

Fill all three blanks to write a unit test that mocks a service, calls the method, and asserts the result.

Microservices

def test_[1]():
    with patch('services.UserService') as mock_service:
        mock_service.[2].return_value = [3]
        result = mock_service.[2]()
        assert result == [3]

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

Aget_user

C{'id': 42, 'name': 'Bob'}

Dfetch_data

Attempts:

3 left

💡 Hint

Common Mistakes

Using different method names in mock and call, or mismatched return values.

The test is named test_get_user. It mocks the get_user method, sets a return value, calls it, and asserts the result matches the mocked data.