allwpilib/shared/cppDesktopTestTask.gradle

model {
    tasks {
        def ts = $.testSuites
        project.tasks.register('testDesktopCpp') { testTask->
            def systemArch = getCurrentArch()
            def found = false
            ts.each {
                if (it in GoogleTestTestSuiteSpec && it.name == "${nativeName}Test") {
                    it.binaries.each {
                        if (found) return
                        def arch = it.targetPlatform.name
                        if (arch == systemArch && it.buildType.name == 'debug') {
                            testTask.dependsOn it.tasks.run
                            found = true
                        }
                    }
                }
            }
        }
    }
}