Tests Analyzer is a free, open-source IntelliJ IDEA plugin for visualizing test execution as a Gantt chart. It was inspired by a conversation at Spring I/O 2026 in Barcelona and built as a hands-on introduction to IntelliJ plugin development. The plugin supports both Gradle and Maven build systems, making it compatible with the majority of Java and Kotlin projects. It works with popular test frameworks including JUnit 5, Kotest, Spock 2.x, and TestNG. Test results are collected in real time using IntelliJ's `SMTestRunnerEventsListener` extension point. A timeline chart shows which tests ran in parallel and which were sequential bottlenecks, making it easy to identify performance issues. A sortable and filterable…
