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Tosca — API testing and simulation

Simulate and test your APIs without downtime

Don’t let unavailable microservices, third-party APIs, or downstream systems stall your sprint. Tricentis API Simulation spins up realistic virtual services in minutes, allowing your team to test continuously long before dependencies are ready.

Demo erhalten

Kostenlos testen

Dependencies break pipelines. Simulation keeps them moving.

Modern applications rely on dozens of third-party services and microservices your team can’t control. When just one dependency goes dark, becomes too costly to call, or isn’t built yet; your entire delivery pipeline grinds to a halt. This compounding delay forces QA to shift risk to the end of the release cycle where bugs cost up to 10X more to fix.

50–70%

of manual tester time spent finding and creating test data from scratch

Source: World Quality Report

Earlier

defect detection when testing starts at the API layer before UI is available

API Testing and Simulation

Accelerate delivery. Don't wait on dependencies.

API Simulation creates intelligent virtual services that substitute for microservices, third-party APIs, and backend systems outside your control. Testing begins the moment requirements are locked, eliminating the wait for upstream or downstream dependencies.
Developers and QA teams share identical simulation artifacts, removing handoff overhead and keeping engineering aligned from day one.

Unblock testing pipelines

Test when you're ready, not when dependencies are.

Build and deploy stateful virtual services for APIs that are unavailable, too costly to call, or not yet built, so your team tests on its own schedule. Virtual services behave like the real thing: stateful, configurable, and available on demand without the infrastructure overhead of standing up full integration environments.

Shift testing left by simulating realistic API behavior the moment requirements are written so QA can validate code long before dependent services exist.
Reduce IT infrastructure costs by replacing costly third-party API calls and unstable integration environments with on-demand virtual services.
Enable on-demand, anytime testing without waiting for environment windows or shared-environment scheduling conflicts.

Catch API failures before they reach consumers

Find the break before your consumers do.

API contracts fail silently until they don’t. Contract testing validates APIs from the consumer’s perspective at every change, so a schema drift or a breaking response format is caught in the pipeline, not in production. Teams can verify integrations continuously without waiting for end-to-end environments.

Validate APIs from the consumer’s perspective to detect breaking changes as they are introduced, not after they have propagated downstream.
Enforce API contracts continuously by integrating contract tests into your CI pipeline so every merge is checked automatically.
Prevent integration failures before they cascade across services and reach end users.

Performance testing without the full environment

Simulate load before the environment can handle it.

Performance issues surface late because teams wait for a complete environment before load testing. API Simulation replicates realistic response times and high-traffic patterns from mobile apps, web portals, and overloaded APIs so performance characteristics can be validated earlier, without provisioning a full performance testing environment for every run.

Simulate realistic response times and traffic volumes to surface performance issues at the API layer before end-to-end environments are needed.
Run large-scale load tests without a full performance environment by simulating the load profile of live systems from virtual services.
Reduce the cost of performance testing by removing the dependency on dedicated infrastructure for every performance validation cycle.

One environment, two teams

Build once. Use it across the whole team.

Developers create early-stage mocks in code. QA engineers need the same artifacts as model-based objects in Tosca.

With API Simulation, the same virtual service works for both, regardless of coding experience. Changes to a simulation propagate instantly across all dependent tests and team members, with no manual synchronization.

Create virtual services as code or codeless, so developers and QA engineers work from the same artifact without duplicating effort.
Propagate simulation changes instantly across all affected tests with Tosca’s model-based approach, so a single update applies everywhere.
Reduce maintenance overhead by managing virtual services as reusable Tosca model-based objects rather than brittle hand-coded stubs.

Vorteile

Simulate anytime, test anywhere

Eliminate testing delays

Start testing immediately by simulating dependent components that are unavailable, not yet built, or still evolving.

Kontinuierliche Tests ermöglichen

Keep developers and testers moving by stabilizing access to dependent systems through always-available virtual services.

Build scenarios rapidly

Create complete simulation scenarios and functional API test cases with easy-to-use workflows that require no deep API expertise.

Reduce infrastructure cost

Replace costly API services and complex integration environments with virtual services that provision on demand.

Catch issues earlier

Identify API failures and contract violations at the source so they never compound into production incidents.

Unify dev and QA workflows

Let developers mock in code and QA teams use the same artifacts as model-based Tosca objects, with shared maintenance.

Funktionen

So funktioniert’s

Simulation und Virtualisierung

Build powerful mock APIs and virtualized environments to start testing before dependent services are available, while lowering IT infrastructure costs.