测试焦点导航

自动执行焦点导航测试可确保您的应用在硬件键盘、D-pad 和无障碍工具中提供一致且可预测的用户体验。Compose 提供了内置的测试 API，可用于模拟按键输入和验证焦点状态。

设置焦点测试

如需编写焦点测试，请使用 Compose 测试库中的 createComposeRule()：

@RunWith(AndroidJUnit4::class)
class FocusNavigationTest {
    @get:Rule
    val composeTestRule = createComposeRule()

验证焦点目标

您可以通过执行点击或请求焦点操作来验证界面元素是否可以接收焦点，然后使用 assertIsFocused() 和 assertIsNotFocused() 断言其状态。

@Test
fun interactiveElement_isFocusTarget() {
    composeTestRule.setContent {
        AppTheme {
            CardListScreen()
        }
    }

    val firstCard = composeTestRule.onNodeWithTag("card_1")
    val secondCard = composeTestRule.onNodeWithTag("card_2")

    // Focus the first element
    firstCard.performClick()
    firstCard.assertIsFocused()
    secondCard.assertIsNotFocused()
}

测试一维焦点遍历

使用 performKeyInput 模拟按 Tab 和 Shift+Tab 键，以验证焦点是否按显示顺序在界面中前进。作为最佳实践，请验证正向导航 (Key.Tab) 和反向导航（按住 Key.ShiftLeft 的同时按 Key.Tab），以确保双向遍历的完整性：

@Test
fun tabKey_navigatesInAppearanceOrder() {
    composeTestRule.setContent {
        AppTheme {
            CardListScreen()
        }
    }

    val firstCard = composeTestRule.onNodeWithTag("card_1")
    val secondCard = composeTestRule.onNodeWithTag("card_2")
    val thirdCard = composeTestRule.onNodeWithTag("card_3")

    firstCard.performClick()
    firstCard.assertIsFocused()

    // Press Tab -> Moves to second card
    firstCard.performKeyInput {
        pressKey(Key.Tab)
    }
    secondCard.assertIsFocused()
    firstCard.assertIsNotFocused()

    // Press Tab -> Moves to third card
    secondCard.performKeyInput {
        pressKey(Key.Tab)
    }
    thirdCard.assertIsFocused()

    // Press Shift + Tab -> Moves backward to second card
    thirdCard.performKeyInput {
        withKeyDown(Key.ShiftLeft) {
            pressKey(Key.Tab)
        }
    }
    secondCard.assertIsFocused()
}

测试二维方向性遍历

使用 Key.DirectionDown、Key.DirectionUp、Key.DirectionRight 和 Key.DirectionLeft 模拟方向键或 D-pad 方向键。

@Test
fun arrowKeys_moveFocusTwoDimensionallyWithoutWrap() {
    composeTestRule.setContent {
        AppTheme {
            GridLayoutScreen()
        }
    }

    val topLeftButton = composeTestRule.onNodeWithTag("btn_top_left")
    val bottomLeftButton = composeTestRule.onNodeWithTag("btn_bottom_left")

    topLeftButton.performClick()
    topLeftButton.assertIsFocused()

    // Down arrow moves focus downward to bottom-left button
    topLeftButton.performKeyInput {
        pressKey(Key.DirectionDown)
    }
    bottomLeftButton.assertIsFocused()

    // Directional keys do not wrap around: pressing Down on bottom element stays focused
    bottomLeftButton.performKeyInput {
        pressKey(Key.DirectionDown)
    }
    bottomLeftButton.assertIsFocused()
}

测试文本字段聚焦行为

验证单行文本字段在按下 Tab 键时会前进焦点，而多行文本字段会保留焦点：

@Test
fun textField_handlesTabAccordingToLineLimits() {
    composeTestRule.setContent {
        AppTheme {
            FormScreen()
        }
    }

    val singleLineNode = composeTestRule.onNodeWithTag("single_line_field")
    val multiLineNode = composeTestRule.onNodeWithTag("multi_line_field")
    val submitButtonNode = composeTestRule.onNodeWithTag("submit_button")

    // Single-line field advances focus on Tab
    singleLineNode.performClick()
    singleLineNode.assertIsFocused()
    singleLineNode.performKeyInput { pressKey(Key.Tab) }
    multiLineNode.assertIsFocused()

    // Multi-line field keeps focus and inserts '\t'
    multiLineNode.performKeyInput { pressKey(Key.Tab) }
    multiLineNode.assertIsFocused()
    submitButtonNode.assertIsNotFocused()

    // Shift + Tab escapes multi-line field to previous target
    multiLineNode.performKeyInput {
        withKeyDown(Key.ShiftLeft) { pressKey(Key.Tab) }
    }
    singleLineNode.assertIsFocused()
}

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