Tosca for API Testing: A Step-by-Step Tutorial

Tricentis Tosca is a powerful and user-friendly test automation tool that supports a wide range of testing types — including API testing. With Tosca, you can easily design, automate, and execute API tests without writing any code. It supports REST, SOAP, and other service types, making it a great choice for end-to-end API validation.

🧰 What is Tosca API Testing?

Tosca’s API testing allows testers to:

Send requests (GET, POST, PUT, DELETE, etc.)

Validate responses (status codes, body, headers)

Chain requests and share data between them

Perform security, load, and functional tests on APIs

✅ Step-by-Step Guide: Tosca API Testing

🔹 Step 1: Open Tosca and Create a Workspace

Launch Tosca Commander

Create a new workspace (or open an existing one)

Choose the workspace type as Multi-user or Single-user based on your setup

🔹 Step 2: Add a New API Test Case

Navigate to the Modules section.

Right-click and choose Scan > API Scan.

The API Scan window opens. You can now scan an API by:

Importing a WSDL (for SOAP)

Importing an OpenAPI/Swagger spec (for REST)

Manually entering the URL and method type (GET, POST, etc.)

🔹 Step 3: Configure Your API Request

Enter the endpoint URL.

Choose the HTTP method (GET, POST, etc.).

Add necessary headers, query parameters, and request body.

Click Send to test and view the response.

🔹 Step 4: Generate Modules from API Scan

Once the API request is working, click "Generate Modules".

Tosca creates reusable Module templates for your API calls.

🔹 Step 5: Create a Test Case Using API Modules

Go to the TestCases section.

Right-click > Add a new TestCase.

Drag the API module from the Modules section into your TestCase.

Fill in values for:

URL

Headers

Payload (for POST, PUT)

Expected results (status code, specific field values)

🔹 Step 6: Add Validations

In the TestCase, use Verification columns to assert:

HTTP status codes (e.g., 200 OK)

Specific JSON/XML fields in the response

Response time or header values

Example:

json

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Expected Status Code = 200  

Expected Response Body field "user.name" = "John"

🔹 Step 7: Execute the API Test

Use Tosca's ExecutionList feature:

Create an ExecutionList

Add your TestCase

Right-click and select Run

View results and logs in the Execution section

🔹 Step 8: Chain Requests Using Tosca Buffer or TestData

Capture values from one API response (e.g., auth token) and reuse in another:

Use Buffer to store the value

Reference that value in the next TestCase step

Example:

plaintext

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{B[auth_token]}  ← referenced in headers or body

🧪 Example Use Case: User Registration and Login

POST /register → Create a user

POST /login → Get token using credentials

GET /profile → Fetch profile using token

Each request can pass data to the next using Tosca buffers.

🛠️ Tips for Effective API Testing in Tosca

Use TestCase Templates for data-driven testing

Validate both positive and negative test scenarios

Integrate Tosca with Jenkins, Azure DevOps, or Git for CI/CD

Use Tosca XScan for quick scanning of APIs

Organize tests in folders for better maintainability

🧠 Conclusion

Tosca makes API testing intuitive, powerful, and code-free. With its built-in API Scan, dynamic test data handling, and integration features, Tosca is an excellent tool for testers of all levels. Following this step-by-step approach, you can start validating APIs with confidence and efficiency.

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