Problems/Coding/Jest/Hard

Hard Jest

Coding problems · 100 total

Implement custom test runner

Create test scheduler

Implement parallel execution

Create worker pool

Implement test isolation

Create sandbox environment

Implement module mocking system

Create import interception

Implement ESM mocking

Create dynamic imports mock

Implement hoisting logic

Create mock factory

Implement auto-mocking

Create manual mock resolution

Implement virtual modules

Create in-memory filesystem

Implement module cache

Create require cache

Implement module resolution

Create custom resolver

Implement path mapping

Create alias resolution

Implement monorepo testing

Create workspace testing

Implement cross-package tests

Create shared test utilities

Implement test orchestration

Create master/worker

Implement load balancing

Create test distribution

Implement fault tolerance

Create test retry

Implement flaky test detection

Create quarantine system

Implement test analytics

Create performance tracking

Implement regression detection

Create CI integration

Implement test splitting

Create intelligent ordering

Implement affected tests

Create dependency graph

Implement change detection

Create minimal test set

Implement incremental testing

Create cache validation

Implement distributed cache

Create remote cache

Implement cache synchronization

Create artifact storage

Implement result caching

Create snapshot management

Implement snapshot diffing

Create snapshot serialization

Implement custom serializers

Create pretty format

Implement diff algorithm

Create unified diff

Implement colored output

Create reporter system

Implement custom reporter

Create JSON reporter

Implement JUnit XML

Create HTML reporter

Implement coverage reporter

Create lcov format

Implement cobertura

Create clover format

Implement text summary

Create detailed report

Implement coverage maps

Create source maps

Implement line coverage

Create branch coverage

Implement function coverage

Create statement coverage

Implement condition coverage

Create path coverage

Implement MC/DC coverage

Create data flow coverage

Implement code instrumentation

Create AST transformation

Implement coverage injection

Create runtime tracking

Implement hit counters

Create branch tracking

Implement condition evaluation

Create execution paths

Implement symbolic execution

Create constraint solver

Implement test generation

Create concolic testing

Implement fuzzing

Create mutation fuzzing

Implement grammar-based fuzzing

Create structure-aware fuzzing

Implement coverage-guided fuzzing

Create test case minimization

Implement delta debugging

Create test suite reduction