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Testing GraphEdge Component Implementation in javascript-algorithms

This test suite validates the GraphEdge implementation in JavaScript, focusing on edge creation, weight handling, and edge reversal functionality. The tests ensure proper graph edge construction and manipulation within the data structure library.

Test Coverage Overview

The test suite provides comprehensive coverage of GraphEdge functionality:

Default weight edge creation and key generation
Custom weight edge initialization
Edge reversal operations
Vertex relationship validation

Integration points include GraphVertex interaction and edge property verification.

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for structured test organization. Each test case isolates specific edge functionality, using GraphVertex instances as test fixtures. The implementation leverages Jest’s expect assertions for property validation and object comparison.

Technical Details

Testing tools and configuration:

Jest testing framework
ES6 import/export syntax
Object equality assertions
Modular test structure
Isolated test cases

Best Practices Demonstrated

The test suite exemplifies quality testing practices through clear test case isolation and comprehensive edge case coverage. Notable practices include:

Descriptive test naming
Single responsibility per test
Complete property verification
Proper test setup and initialization

trekhleb/javascript-algorithms

src/data-structures/graph/__test__/GraphEdge.test.js

            
import GraphEdge from '../GraphEdge';
import GraphVertex from '../GraphVertex';

describe('GraphEdge', () => {
  it('should create graph edge with default weight', () => {
    const startVertex = new GraphVertex('A');
    const endVertex = new GraphVertex('B');
    const edge = new GraphEdge(startVertex, endVertex);

    expect(edge.getKey()).toBe('A_B');
    expect(edge.toString()).toBe('A_B');
    expect(edge.startVertex).toEqual(startVertex);
    expect(edge.endVertex).toEqual(endVertex);
    expect(edge.weight).toEqual(0);
  });

  it('should create graph edge with predefined weight', () => {
    const startVertex = new GraphVertex('A');
    const endVertex = new GraphVertex('B');
    const edge = new GraphEdge(startVertex, endVertex, 10);

    expect(edge.startVertex).toEqual(startVertex);
    expect(edge.endVertex).toEqual(endVertex);
    expect(edge.weight).toEqual(10);
  });

  it('should be possible to do edge reverse', () => {
    const vertexA = new GraphVertex('A');
    const vertexB = new GraphVertex('B');
    const edge = new GraphEdge(vertexA, vertexB, 10);

    expect(edge.startVertex).toEqual(vertexA);
    expect(edge.endVertex).toEqual(vertexB);
    expect(edge.weight).toEqual(10);

    edge.reverse();

    expect(edge.startVertex).toEqual(vertexB);
    expect(edge.endVertex).toEqual(vertexA);
    expect(edge.weight).toEqual(10);
  });
});