Rigorously test fast-changing APIs within an iteration


The VIP Test Modeller makes complex API testing simple, using a visual approach to generate rigorous API tests and data from easy-to-use flowcharts.

Generate automated tests and data for every combination of API call:

Faster, simpler, and more rigorous.

Testing complex APIs with The VIP Test Modeller is:

  • As complex as your system, using a simple drag-and-drop approach to generate optimised tests for complex chains of APIs.
  • Reactive to change, using central models to update automated tests and data when your APIs change, with full version control to test against every possible request.
  • Structured and measurable, with expected results clearly and fully defined, and mathematical coverage measures to know exactly what is being tested.
  • Faster, automating complex tasks like API test creation, test data definition, and the formulation of complete expected results.
  • “Single pane of glass”, executing automated API tests across a range of proprietary and homegrown frameworks, as well as open source tools like REST Assured.
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Prepare complex APIs for every version of request


With The VIP Test Modeller, you can generate up-to-date tests and data from easy-to-maintain flowcharts. Full version control allows you to test against every previous version of request users could make.

Slow and Manual API TestingAPI Testing with The VIP Test Modeller

1. Testers Slowly and Manually Formulate Complex API Tests:

A single API can request a vast range of data. QA must identify every combination of call and data needed for rigorous API testing, but they are faced with incomplete documentation and highly technical specification files. Slow and complex test design misses out most of the possible tests.

1. Model Complex APIs as Easy-to-Use Flowcharts:

Clear and precise flowcharts are built automatically from API documentation and existing tests. The visual flowcharts map all possible routes that data can flow through an API. Missing logic is quickly spotted and added, and rigorous tests are generated automatically for every possible end point.

2. Expected Results Undermine Testing Confidence:

Testers must formulate the expected results needed to verify that each request gets the right response when used to call each data combination. These hard-to-define expected results are often missing from documentation, leaving QA teams guessing.

2. Define Full and Accurate Expected Results Easily:

Testers build asserts into the flowchart models, and generate expected results at the same time as the rigorous API tests. Mid-test asserts validate that an API functions correctly at every point in its logic, and testers know they got the right result, for the right reason.

3. Test Data Risks Non-Compliance and Undermines Testing Rigour:

Testers execute their requests against an incomplete database that only contains a fraction of the data types that might be requested in production. The majority of combinations go untested, leaving APIs exposed to costly bugs that will be highly time-consuming to fix post-release.

3. Specify “Just in Time” Test Data for Every Possible Test:

Dynamic test data is defined for each test step contained in the model, using a comprehensive range of over 500 easy-to-use data creation functions. The combinable functions resolve “just in time” during execution, ensuring that there is up-to-date test data to rigorously test every combination.

4. Resource-Intensive Testing leaves API Chains Vulnerable:

The number of possible tests grows exponentially as APIs are chained together, but QA teams lack the systematic or automatic means to reduce the vast number of tests. Resource-intensive API testing exercises only a minority of the call chains that could be executed post-release.

4. Generate the Smallest Set of API Tests Needed for Rigorous Testing:

QA teams drag-and-drop subflows from a shared repository to chain together APIs. The subflows contain all automation logic and data needed for testing, and coverage algorithms generate the smallest set of tests needed test complex API chains rigorously tested in-sprint.

5. Slow and Erroneously Data Comparisons:

Testers execute their tests, producing large quantities of complex responses. They must compare the resultant data slowly to poorly defined expected results, laboriously formulating run results.

5. Rapid "Single Pane of Glass" Test Execution:

API tests are executed across proprietary, homegrown, or open source frameworks. Responses are compared automatically to the expected results, with run results formulated automatically in a range of formats.

6. Manual Maintenance Quickly Falls Behind Changing APIs:

Updating the central model maintains all the API tests and data automatically. Full version control allows testers to quickly and simply roll-back to a previous version of their API tests, validating that the new API functions as it should when all version of API call are sent to it.

6. Rapidly Test Against Every Possible Version of Request:

Updating the central model maintains all the API tests and data automatically. Full version control allows testers to quickly and simply roll-back to a previous version of their API tests, validating that the new API functions as it should when all version of API call are sent to it.
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