How to output assertEquals difference in terminal?

I would like to be able to see/parse the assertEquals difference from a failed test in the terminal. However, it does not seem to render, also not in the generated report.

What can I do?

Currently, I have no special config in build.gradle.kts about tests.

dependencies {
    testImplementation(libs.junit)
    testImplementation(libs.opentest4j)
...
}