IntelliJ IDEA内置功能咨询：列出无测试类及测试相关操作

Hey there! Let's break down your questions about IntelliJ IDEA's test tools, since you're currently using Gradle's Jacoco task and curious about built-in IDE features:

1. How to list all classes without corresponding test classes? #

IntelliJ IDEA has two simple built-in ways to track these down:

• Use Inspections: Open Settings/Preferences > Editor > Inspections, navigate to Java > Testing frameworks > Missing test, and enable this inspection. Right-click your project or module, select Inspect Code, and once the scan finishes, you'll get a clear list of all source files that don't have matching test classes in the results panel.
• Project View Filter: Click the funnel icon at the top of the Project window, select Customize Filters, then check the Missing Tests option. This will filter your project view to only show classes lacking corresponding test classes (or highlight them, depending on your setup).

2. Does IDEA support jumping between test classes and source files, and creating tests for classes? #

Absolutely—this is one of IDEA's core time-saving test workflow features:

• Jump between source and test: Press Ctrl+Shift+T (Windows/Linux) or Cmd+Shift+T (Mac) while in a source file to instantly jump to its test class, and vice versa. You can also click the small test icon next to the class name in the editor's left gutter to make the jump with a single click.
• Create a test class: Use the same Ctrl+Shift+T/Cmd+Shift+T shortcut when in a source file with no existing test. A popup will let you pick your test framework (JUnit 4/5, TestNG, etc.), select which methods to generate test stubs for, and set the save directory (it'll automatically align with your project's source/test structure like src/main/java → src/test/java).

3. IDEA built-in features vs. Gradle Jacoco task #

Jacoco is focused on generating code coverage reports, and IDEA offers both its own native coverage tool and full integration with Jacoco:

• IDEA's native Code Coverage: When running tests, select "Run with Coverage" from the run button dropdown. After tests finish, you'll see real-time coverage highlights in the editor (green = covered, red = uncovered, yellow = partially covered) plus a detailed report with class/method/line coverage stats. No extra setup needed for basic coverage tracking.
• Jacoco Integration: If you prefer sticking with Gradle's Jacoco task, IDEA plays nicely with it. You can run the jacocoTestReport task from the Gradle tool window, and IDEA will let you open the generated HTML report directly. You can also configure IDEA to use Jacoco's coverage data for editor highlights by going to Settings/Preferences > Build, Execution, Deployment > Coverage and pointing it to your Jacoco output files.

内容的提问来源于stack exchange，提问作者WesternGun