Data providers pattern in Selenium Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a simple data provider function that returns test data.

Selenium Python

def data_provider():
    return [1]

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

A[('user1', 'pass1'), ('user2', 'pass2')]

B{'user1': 'pass1', 'user2': 'pass2'}

C('user1', 'pass1', 'user2', 'pass2')

D['user1', 'pass1', 'user2', 'pass2']

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a dictionary instead of a list of tuples.

Returning a flat list instead of tuples.

The data provider should return a list of tuples, each tuple representing a set of test data.

2fill in blank

medium

Complete the test function to use the data provider with pytest's parametrize decorator.

Selenium Python

@pytest.mark.parametrize('username, password', [1])
def test_login(username, password):
    assert username != '' and password != ''

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

Adata_provider()

Bdata_provider

Cdata_provider[]

Ddata_provider{}

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the function with parentheses inside the decorator.

Using brackets or braces instead of parentheses.

The parametrize decorator expects the function name without parentheses to use it as a data provider.

3fill in blank

hard

Fix the error in the data provider function that causes a syntax error.

Selenium Python

def data_provider():
    return [
        ('user1', 'pass1'),
        ('user2', 'pass2')[1]
    ]

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

A,

B;

C.

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon or colon instead of comma.

Missing the separator entirely.

In Python lists, items are separated by commas. Missing a comma causes a syntax error.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps usernames to passwords from the data provider list.

Selenium Python

credentials = [1] for user, pwd in data_provider() if user [2] 'user1'

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

A{user: pwd}

B{pwd: user}

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping key and value in the dictionary.

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

The dictionary comprehension should map user to password, and filter where user equals 'user1'.

5fill in blank

hard

Fill all three blanks to create a test function that uses the data provider and asserts the password length is at least 5.

Selenium Python

@pytest.mark.parametrize('[1]', [2])
def test_password_length([3]):
    assert len(password) >= 5

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

A'username, password'

Bdata_provider()

Cusername, password

D'user, pass'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter names in the decorator string.

Not calling the data provider function.

Using quotes around function parameters.

The parametrize decorator needs the parameter names as a string, the data provider function call, and the test function parameters without quotes.

Practice

1. What is the main purpose of using the data providers pattern in Selenium Python tests?

easy

A. To generate test reports in different formats

B. To speed up the browser loading time

C. To create new test cases automatically

D. To run the same test multiple times with different input data

Solution

1. Step 1: Understand the data providers pattern

   The data providers pattern allows running one test repeatedly with different sets of data.

2. Step 2: Identify the main benefit

   This helps find more bugs by testing various inputs without writing separate tests.

3. Final Answer:

   To run the same test multiple times with different input data -> Option D

4. Quick Check:

   Data providers = run test many times with different data [OK]

Hint: Remember: data providers = repeat test with new data [OK]

Common Mistakes:

• Thinking data providers speed up browser loading
• Confusing data providers with automatic test creation
• Believing data providers generate reports

2. Which of the following is the correct syntax to use a data provider in pytest for Selenium Python?

easy

A. @pytest.mark.parametrize('input', ['data1', 'data2'])

B. @pytest.run_with_data(['data1', 'data2'])

C. @pytest.test_data(['data1', 'data2'])

D. @pytest.data_provider(['data1', 'data2'])

Solution

1. Step 1: Recall pytest data provider syntax

   Pytest uses @pytest.mark.parametrize to supply multiple data sets to a test function.

2. Step 2: Match the correct syntax

   @pytest.mark.parametrize('input', ['data1', 'data2']) correctly shows @pytest.mark.parametrize('input', ['data1', 'data2']).

3. Final Answer:

   @pytest.mark.parametrize('input', ['data1', 'data2']) -> Option A

4. Quick Check:

   Pytest data provider = @pytest.mark.parametrize [OK]

Hint: Look for @pytest.mark.parametrize for data providers [OK]

Common Mistakes:

• Using non-existent decorators like @pytest.data_provider
• Confusing parametrize with test_data or run_with_data
• Missing quotes around parameter names

3. What will be the output of the following pytest test using data providers?

import pytest

@pytest.mark.parametrize('num', [1, 2, 3])
def test_is_positive(num):
    assert num > 0

medium

A. All tests pass

B. All tests fail

C. Only the test with num=1 passes

D. Syntax error occurs

Solution

1. Step 1: Analyze the test logic

   The test asserts that the input number is greater than zero.

2. Step 2: Check each data value

   Values 1, 2, and 3 are all greater than zero, so all assertions pass.

3. Final Answer:

   All tests pass -> Option A

4. Quick Check:

   All nums > 0, so tests pass [OK]

Hint: Check if all inputs satisfy the assertion [OK]

Common Mistakes:

• Assuming some inputs fail without checking values
• Thinking syntax error due to parametrize
• Ignoring that all numbers are positive

4. Identify the error in this pytest data provider usage:

@pytest.mark.parametrize('input', [1, 2, 3])
def test_example():
    assert input > 0

medium

A. Wrong decorator name

B. Missing parameter in test function definition

C. List of inputs should be strings

D. Assertion syntax is incorrect

Solution

1. Step 1: Check test function parameters

   The test function must accept the parameter named in parametrize, here 'input'.

2. Step 2: Identify missing parameter

   The function test_example() has no parameters, so 'input' is undefined inside it.

3. Final Answer:

   Missing parameter in test function definition -> Option B

4. Quick Check:

   Parametrize param must match function argument [OK]

Hint: Function must accept all parametrize arguments [OK]

Common Mistakes:

• Forgetting to add parameter to test function
• Using wrong decorator name
• Thinking input list must be strings
• Misreading assertion syntax

5. You want to test a login form with multiple username and password pairs using data providers in pytest. Which approach correctly handles multiple parameters?

hard

A. @pytest.mark.parametrize('username', ['user1', 'user2'])
@pytest.mark.parametrize('password', ['pass1', 'pass2'])
def test_login(username, password):
assert username and password

B. @pytest.mark.parametrize('username_password', [('user1', 'pass1'), ('user2', 'pass2')])
def test_login(username_password):
assert username_password[0] and username_password[1]

C. @pytest.mark.parametrize(('username', 'password'), [('user1', 'pass1'), ('user2', 'pass2')])
def test_login(username, password):
assert username and password

D. @pytest.mark.parametrize('username', ['user1', 'user2'], 'password', ['pass1', 'pass2'])
def test_login(username, password):
assert username and password

Solution

1. Step 1: Understand multiple parameter usage in parametrize

   To pass multiple parameters together, use a tuple of parameter names and a list of tuples with values.

2. Step 2: Identify correct syntax

   @pytest.mark.parametrize(('username', 'password'), [('user1', 'pass1'), ('user2', 'pass2')]) def test_login(username, password): assert username and password uses @pytest.mark.parametrize(('username', 'password'), [('user1', 'pass1'), ('user2', 'pass2')]), which is correct.

3. Final Answer:

   Use tuple of parameter names and list of tuples for values -> Option C

4. Quick Check:

   Multiple params = tuple names + list of tuples [OK]

Hint: Use tuple of names and list of tuples for multiple params [OK]

Common Mistakes:

• Stacking multiple parametrize decorators incorrectly
• Passing multiple parameters in one string without tuple
• Wrong syntax with multiple lists in one decorator