TestNG Parallel Execution

Master TestNG parallel test execution including thread pool configuration, suite-level parallelism, method-level parallelism, and thread safety patterns. This skill covers techniques for maximizing test throughput while maintaining test reliability.

Overview

TestNG supports parallel execution at multiple levels: suite, test, class, and method. Proper parallel configuration can significantly reduce test execution time, but requires careful consideration of thread safety and resource management.

Parallel Execution Modes

Suite-Level Parallelism

Run multiple <test> tags in parallel:

<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="Parallel Suite" parallel="tests" thread-count="3">