sf-apex-testing

To write Apex unit tests that avoid governor limits, use Test.startTest and Test.stopTest to isolate asynchronous execution and bulk scenarios. Testing with large record counts validates that triggers respect Salesforce transaction limits.

A TestDataFactory pattern in Apex is a centralized class that generates consistent test records. You should use it with TestSetup annotations to ensure isolated transactions and maintainable test data across all unit tests.

Mock HTTP callouts in Apex test classes by implementing the HttpCalloutMock interface or using System.createStub patterns. These mocks inject deterministic responses, allowing tests to run without making live external network requests.

Yes, you can test Queueable and future methods in Salesforce deployments by wrapping the asynchronous call between Test.startTest and Test.stopTest. This ensures the async job executes synchronously within the test context.

The best way to increase Apex code coverage for CI pipelines is to enforce branch testing with assertions and Arrange-Act-Assert patterns. Using RunRelevantTests and centralized test factories ensures reliable coverage thresholds.

Apex deployment tests fail in production but pass in sandbox when test data lacks isolation or misses bulk scenarios. Using TestSetup and mocking callouts with HttpCalloutMock ensures deterministic tests independent of environment data.