withTestApplication

watchPaths

embeddedServer

watchPaths

Application.*

fun Application.configuration() {
	(environment.config as? MapApplicationConfig)?.apply {
		if (propertyOrNull("ktor.deployment.watch") === null) {
			put(
				"ktor.deployment.watch",
				"silence 'No ktor.deployment.watch patterns specified' in ApplicationEngineEnvironmentReloading"
			)
		}
	}

ApplicationEngineEnvironmentReloading

private fun endpointTest(test: TestApplicationEngine.() -> Unit) {
	withApplication(
		environment = createTestEnvironment {
			(config as? MapApplicationConfig)?.apply {
				if (propertyOrNull("ktor.deployment.watch") === null) {
					put(
						"ktor.deployment.watch",
						listOf("silence 'No ktor.deployment.watch patterns specified' in ApplicationEngineEnvironmentReloading")
					)
				}
			}
		}
	) {
		/* I apply my `fun Application.module()` setup here */
		test()
	}
}

No ktor.deployment.watch patterns match classpath entries, automatic reload is not active

ktor.test

withApplication(
	environment = createTestEnvironment {
		val originalLog = log
		log = object : Logger by originalLog {
			override fun info(msg: String?) {
				when (msg) {
					"No ktor.deployment.watch patterns specified, automatic reload is not active" -> Unit
					else -> <http://originalLog.info|originalLog.info>(msg)
				}
			}
		}
	}
)