Definition
In Salesforce development, the process of testing how custom code and configurations interact with external systems, APIs, and other Salesforce components to verify that data flows correctly across integration points.
Real-World Example
At their company, an architect at Skyline Consulting leverages Integration Testing to extend their Salesforce implementation to meet growing business demands. Integration Testing provides the additional capability they need without requiring a separate third-party system, keeping everything within the trusted Salesforce ecosystem and reducing integration complexity.
Why Integration Testing Matters
In Salesforce development, Integration Testing is the process of testing how custom code and configurations interact with external systems, APIs, and other Salesforce components to verify that data flows correctly across integration points. Unlike unit testing (which verifies individual pieces in isolation), integration testing exercises the seams between systems where most real-world bugs hide: format mismatches, authentication failures, partial failures, and unexpected response shapes from external services.
Integration testing is harder than unit testing because it requires actual or mocked external systems to test against, more setup, and more time per test run. But it catches a class of bugs that unit testing misses entirely. Mature Salesforce projects use a combination of approaches: unit tests for Apex code logic (with mocks for external dependencies), integration tests against sandbox versions of external systems, and end-to-end tests for the most critical user flows. Sandboxes are typically the staging environment for integration testing, with Full and Partial Copy sandboxes providing realistic data.
How Organizations Use Integration Testing
- •Quantum Labs — Maintains a dedicated integration test suite that runs against sandbox versions of their external systems, catching format mismatches before production deployment.
- •TerraForm Tech — Uses contract tests between their Salesforce integrations and external services to verify both sides agree on the expected request and response formats.
- •CodeBridge — Treats integration testing as a separate category from unit testing in their CI pipeline, with different cadences and tooling.