home > research > flashcards > python-hypothesis-drill

Mastering Hypothesis: A Comprehensive Guide

Table of Contents

1. Hypothesis Drill

1. Hypothesis Drill

1.1. Strategies

1.1.1. What is a strategy in Hypothesis? drill python_hypothesis

1.1.1.1. Answer

A way to generate test data for a specific type of input.

1.1.2. How do I define a custom strategy in Hypothesis? drill python_hypothesis

1.1.2.1. Answer

Using the `@st.composite` decorator.

1.1.3. What is the `st.integers` strategy in Hypothesis? drill python_hypothesis

1.1.3.1. Answer

A strategy that generates random integers.

1.1.4. What is the `st.text` strategy in Hypothesis? drill python_hypothesis

1.1.4.1. Answer

A strategy that generates random text.

1.2. Properties

1.2.1. What is a property in Hypothesis? drill python_hypothesis

1.2.1.1. Answer

A statement that should hold true for all possible inputs.

1.2.2. How do I define a property in Hypothesis? drill python_hypothesis

1.2.2.1. Answer

Using the `@given` decorator.

1.2.3. How do I specify the strategy for a property in Hypothesis? drill python_hypothesis

1.2.3.1. Answer

By passing the strategy as an argument to the `@given` decorator.

1.3. Testing

1.3.1. How do I run a Hypothesis test? drill python_hypothesis

1.3.1.1. Answer

Using the `pytest` command with the `–hypothesis` flag.

1.3.2. What happens if a Hypothesis test fails? drill python_hypothesis

1.3.2.1. Answer

Hypothesis will attempt to find a minimal example that causes the test to fail.

1.4. Settings

1.4.1. How do I configure the number of examples Hypothesis generates? drill python_hypothesis

1.4.1.1. Answer

Using the `–hypothesis-max-examples` flag.

1.4.2. How do I configure the timeout for Hypothesis tests? drill python_hypothesis

1.4.2.1. Answer

Using the `–hypothesis-timeout` flag.

1.5. Statistics

1.5.1. How do I view statistics about Hypothesis tests? drill python_hypothesis

1.5.1.1. Answer

Using the `–hypothesis-show-statistics` flag.

1.6. Debugging

1.6.1. How do I debug a Hypothesis test? drill python_hypothesis

1.6.1.1. Answer

Using the `–hypothesis-verbosity` flag to increase verbosity.

1.7. Integration with Pytest

1.7.1. How do I use Hypothesis with Pytest? drill python_hypothesis

1.7.1.1. Answer

By installing the `pytest-hypothesis` plugin.

1.7.2. How do I mark a Pytest test as a Hypothesis test? drill python_hypothesis

1.7.2.1. Answer

Using the `@pytest.mark.hypothesis` decorator.