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Testing Builder Pattern Building Construction in python-patterns

This test suite validates the Builder pattern implementation for creating different types of buildings (House, Flat, ComplexHouse) in Python. It verifies both simple and complex construction scenarios through dedicated test classes.

Test Coverage Overview

The test suite provides comprehensive coverage of building object construction scenarios.

Key areas tested include:

Simple house construction with size and floor verification
Flat construction with appropriate property validation
Complex house building using the construct_building director

Edge cases focus on proper property initialization and builder pattern implementation validation.

Implementation Analysis

The testing approach uses unittest’s assertion framework to verify object properties after construction. The implementation follows classic Builder pattern testing practices with separate test classes for simple and complex scenarios.

Technical patterns include:

Individual test methods for each building type
Property assertion verification
Director pattern testing with construct_building

Technical Details

Testing tools and configuration:

Python unittest framework
TestCase class inheritance
assertEqual assertion method
Modular test organization with TestSimple and TestComplex classes

Best Practices Demonstrated

The test suite demonstrates solid testing practices through clear separation of concerns and focused test methods.

Notable practices include:

Logical test class organization
Descriptive test method names
Focused assertions for specific properties
Clean separation between simple and complex building scenarios

faif/python-patterns

tests/creational/test_builder.py

            
import unittest

from patterns.creational.builder import ComplexHouse, Flat, House, construct_building


class TestSimple(unittest.TestCase):
    def test_house(self):
        house = House()
        self.assertEqual(house.size, "Big")
        self.assertEqual(house.floor, "One")

    def test_flat(self):
        flat = Flat()
        self.assertEqual(flat.size, "Small")
        self.assertEqual(flat.floor, "More than One")


class TestComplex(unittest.TestCase):
    def test_house(self):
        house = construct_building(ComplexHouse)
        self.assertEqual(house.size, "Big and fancy")
        self.assertEqual(house.floor, "One")