In this fix start destination args are now processed and stored into bundle. However, missing required arguments in startDestination is not caught during runtime when:

startRoute == startDestination.route here. We assume placeholders will fallback to default value but we don't verify if default values are present.
matchingArgs == null here. We proceed to navigate with the resulting bundle not containing required args.

Repro test:

    @UiThreadTest
    @Test
    fun testStartDestinationWithArg() {
        val navController = createNavController()
        navController.graph = navController.createGraph(
            route = "graph", startDestination = "start_test/{arg}"
        ) {
            test("start_test/{arg}") {
                argument("arg") {
                    type = NavType.IntType
                }
            }
        }
        assertThat(navController.currentDestination?.route).isEqualTo("start_test/{arg}")
    }

Test should throw due to missing Int arg but it completes successfully.

Issue 362594265

Links (4)

Issue metadata