pytest-html for HTML reports - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this pytest-html report generation command?

You run the following command to generate an HTML report after your pytest tests:

pytest --html=report.html --self-contained-html

What will be the result?

A No report file is created because --self-contained-html is not a valid option.

B An HTML file named report.html is created but requires external CSS and JS files to display properly.

C An HTML file named report.html is created with embedded CSS and JavaScript for a standalone report.

D The command runs tests but outputs results only in the console, no HTML file is generated.

💡 Hint

Think about what --self-contained-html means for the report file.

The --html option creates an HTML report file. The --self-contained-html option embeds all CSS and JS inside the HTML file, making it standalone and portable.

❓ assertion

intermediate

Which assertion correctly verifies the presence of the HTML report file after pytest run?

After running pytest with pytest-html, you want to check in your test script that the report file was created.
Which assertion is correct?

PyTest

import os

def test_report_exists():
    # Assume pytest run already happened
    # Which assertion below is correct?
    pass

A assert os.path.exists('report.html') == False

B assert os.path.isfile('report.html')

C assert os.path.isdir('report.html')

D assert 'report.html' in os.listdir() == False

💡 Hint

Check if the file exists and is a file, not a directory.

os.path.isfile returns True if the path exists and is a file. This is the correct way to assert the report file was created.

🔧 Debug

advanced

Why does the pytest-html report not include screenshots on failure?

You configured pytest-html to generate reports and added code to capture screenshots on test failure.
However, the screenshots do not appear in the HTML report.
What is the most likely reason?

A The screenshots were saved but not attached to the pytest-html report using the extra argument.

B pytest-html does not support embedding images in reports.

C Screenshots must be saved as .txt files to appear in the report.

D The report file was generated before the screenshots were taken.

💡 Hint

Think about how pytest-html expects extra content to be added.

pytest-html requires screenshots to be attached using the pytest_html.extras.image() function passed as an extra argument to the report. Simply saving screenshots is not enough.

❓ framework

advanced

How to customize the pytest-html report title?

You want to change the default title of the pytest-html report to "My Test Report".
Which method correctly achieves this?

A Use pytest --html=report.html and add a pytest_html_report_title hook in conftest.py to set the title.

B Add a pytest hook in conftest.py to set config._metadata['Title'] = 'My Test Report'

C Rename the generated report.html file to My Test Report.html after pytest finishes.

D Run pytest with --html=report.html --self-contained-html --title="My Test Report"

💡 Hint

Look for a pytest hook specifically for report title customization.

pytest-html supports customizing the report title by implementing the pytest_html_report_title hook in conftest.py, where you set report.title to the desired string.

🧠 Conceptual

expert

What is the main advantage of using --self-contained-html with pytest-html reports?

Consider the following options about the --self-contained-html flag when generating pytest-html reports.
Which statement best describes its main advantage?

A It enables live updating of the report while tests are running.

B It compresses the report file to reduce disk space usage significantly.

C It automatically uploads the report to a remote server for sharing.

D It embeds all CSS and JavaScript inside the HTML file, making the report portable without external dependencies.

💡 Hint

Think about what 'self-contained' means for a file.

The --self-contained-html option embeds all required CSS and JS inside the HTML file, so the report can be opened anywhere without needing extra files.