Tosca API Testing: Step-by-Step Guide

As modern applications increasingly rely on APIs for data exchange and backend logic, API testing has become an essential part of the software testing lifecycle. Tosca by Tricentis is a powerful test automation tool that supports end-to-end testing—including robust API testing capabilities. Whether you’re testing REST, SOAP, or other service types, Tosca makes it possible to automate without scripting, using its intuitive model-based approach.

In this blog, we’ll walk through a step-by-step guide to performing API testing with Tosca, from setup to execution.


What is Tosca API Testing?

Tosca API Testing enables you to test web services and APIs without needing a GUI. You can verify requests and responses, validate response codes and content, and chain API calls as part of a complete end-to-end scenario. It's especially useful for testing microservices, integrations, and backend systems early in the development cycle.


Step 1: Create a Tosca Workspace

To get started, open Tosca Commander and create a new workspace:

  • Launch Tosca Commander.
  • Choose Create new workspace.
  • Name your workspace (e.g., "APITestingDemo") and select a location.
  • This workspace will hold your API test cases, modules, and data.


Step 2: Scan or Import the API

  • Tosca offers multiple ways to bring APIs into your project:
  • Scan using URL: For REST APIs, provide the base URL and endpoints.
  • Import WSDL/Swagger/OpenAPI definition: For SOAP or REST, use service definitions to auto-generate modules.

To import an OpenAPI/Swagger definition:

  • Right-click on Modules > Scan > API Scan.
  • Choose Import API Definition.
  • Paste the Swagger URL or upload a JSON/YAML file.
  • Tosca automatically generates the request and response structures.


Step 3: Create Test Cases

After scanning, Tosca will create reusable modules that represent API operations (like GET, POST, PUT, DELETE). You can now use them to build test cases.

Go to the TestCases section.

Right-click and select Create new folder (e.g., "UserAPITests").

Right-click the folder > Create TestCase.

Drag and drop the API modules into the TestCase.

Each module represents a step—such as sending a request or validating a response.


Step 4: Set Parameters and Headers

In the test step, you can define request parameters, headers, and body values:

Use TestStepValues to enter API keys, content-type, or dynamic variables.

You can also use Business Parameters to make your test reusable with different data sets.

Example:

json


{

  "username": "testuser",

  "email": "user@example.com"

}

Set this as the request body for a POST request in JSON format.


Step 5: Validate API Responses

You can verify:

HTTP status codes (e.g., 200 OK, 400 Bad Request)

Response body values (e.g., JSON fields)

Headers or response time

Tosca allows you to set verification points on expected output directly in the test step—no scripting required.

Example:

Expected Status: 200

Expected Field: message = "User created successfully"


Step 6: Run the Test

Right-click on the test case and choose Run in ScratchBook or ExecutionList for batch execution. Tosca will run the API call and validate the output against your assertions.

Results are logged with full details of requests, responses, and comparison results.


Conclusion

Tosca makes API testing accessible with its no-code, model-based approach. By following the steps above, you can efficiently test REST and SOAP APIs, validate complex scenarios, and integrate these tests into larger test suites. This empowers testers to detect defects early and maintain high-quality APIs across their software systems.

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Read More: Tosca Automation for Web Applications


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