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Validating Heap Class Abstraction in javascript-algorithms

This test suite validates the core functionality of the Heap data structure implementation, specifically focusing on instance creation restrictions. It ensures proper abstraction and prevention of direct Heap instantiation, which is crucial for maintaining the integrity of the abstract base class pattern.

Test Coverage Overview

The test coverage focuses on the fundamental instantiation behavior of the Heap class.

Tests direct instantiation prevention
Verifies error throwing mechanism
Ensures abstract class behavior
Validates constructor restrictions

Implementation Analysis

The testing approach employs Jest’s exception testing patterns to verify proper class abstraction.

The implementation uses Jest’s expect().toThrow() assertion to validate that direct instantiation attempts are properly prevented. The test utilizes closure-based setup through an instantiation function to properly capture the throwing behavior.

Technical Details

Testing Framework: Jest
Test Structure: Describe/It blocks
Assertion Methods: expect(), toThrow()
Setup: Direct class instantiation attempt
Error Handling: Exception catching and validation

Best Practices Demonstrated

The test demonstrates several key testing best practices for abstract class validation.

Proper isolation of test cases
Clear test description naming
Single responsibility principle in test design
Effective error case handling
Clean setup and teardown approach

trekhleb/javascript-algorithms

src/data-structures/heap/__test__/Heap.test.js

            
import Heap from '../Heap';

describe('Heap', () => {
  it('should not allow to create instance of the Heap directly', () => {
    const instantiateHeap = () => {
      const heap = new Heap();
      heap.add(5);
    };

    expect(instantiateHeap).toThrow();
  });
});