class Subcommand : CliktCommand() {

    private val environment: Environment by requireObject()
    
    override fun run() {
        echo(environment.value)
    }
}

class SubcommandTest : CliktCommand() {
    
    lateinit var subcommand: Subcommand
    
    lateinit var testConsole: StringBufferConsole
    
    @BeforeEach
    fun beforeEach() {
        testConsole = StringBufferConsole()
        subcommand = Subcommand()
            .context {
                console = testConsole
                obj = Environment(value = "test")
                // but there is no `obj` available in Context.Builder
            }
    }
    
    @Test
    fun `It should echo environment value`() {
        subcommand.parse(emptyArray())
        
        assertThat(testConsole.output).contains("test")
    }
}

subcommand.currentContext.obj

beforeEach()

class SubcommandTest(forceEnvironment: Environment? = null) : CliktCommand() {
    private val environment: Environment by requireObject()
    
    override fun run() {
        val useEnvironment = forceEnvironment ?: environment
        echo(useEnvironment.value)
    }
}

obj

obj