TestCanvasExists.kt

    @get:Rule
    val composeTestRule = createComposeRule()

    @Test
    fun checkCanvasExistence() {
        val list = mutableStateOf(listOf(1, 2, 3, 4, 5, 6, 7, 8))
        composeTestRule.setContent {
            BarChartCanvas(list = list.value, barSelected = {  })
        }
        composeTestRule.onNodeWithTag(testTag = "BarChart").assertExists()
    }