Behavior-Based Test Techniques

In the ISTQB Advanced Level Test Analyst syllabus (v4.0), behavior-based test techniques are black-box techniques that derive test cases from how the test object behaves over time or in response to events, rather than from input data partitions or business rules alone. They model sequences, states, operations and interactions, so the Test Analyst can check that the system responds correctly to a series of actions. The syllabus covers three main techniques. 1. CRUD testing: This technique focuses on the life cycle of data entities and the Create, Read, Update and Delete operations performed on them. The analyst builds a CRUD matrix that maps system functions or users to the operations they perform on each entity. Tests then check that every operation is performed correctly and that entity life cycles (for example create, then update, then read, then delete) behave consistently. The matrix can also expose gaps, such as an entity that is created but never deleted, and access-rights issues. 2. State transition testing: The test object is modeled as states, events, guard conditions, actions and transitions, shown as a state diagram or state table. Coverage criteria include all states coverage, valid transitions coverage (0-switch), all transitions coverage (which also tests invalid transitions), and N-switch coverage for sequences of transitions. This technique suits embedded systems, workflows, protocols and user interface navigation. 3. Scenario-based testing: Tests are derived from scenarios such as use cases, user stories or business processes. They cover the main (basic) flow, alternative flows and exception flows, including interactions between actors and the system. Coverage is measured as the percentage of identified scenarios or paths that have been exercised. The Test Analyst chooses among these techniques based on risk, the available test basis and the nature of the system. They also identify relevant coverage items and measure coverage. Behavior-based techniques are often combined with data-based techniques (such as domain testing) and rule-based techniques (such as decision tables) to achieve thorough, efficient and risk-focused test design. In the ISTQB Advanced Level Test Analyst syllabus (v4.0), behavior-based test techniques are black-box techniques that derive test cases from how the test object behaves over time or in response to events, rather than from input data partitions or business rules alone. They model sequences, states,…