断言ImageView加载了特定的可绘制资源ID

Question

我正在写一个Robolectric单元测试，我需要断言一个ImageView让setImageResource(int)用一定的资源ID调用它。我正在使用fest-android进行断言但它似乎没有包含这个断言。

我也尝试从ImageView获取来自Robolectric的ShadowImageView，因为我知道它曾经让你访问它，但它现在已经消失了。

最后，我尝试在我的代码中调用setImageDrawable而不是setImageResource，然后在我的测试断言中这样：

assertThat(imageView).hasDrawable(resources.getDrawable(R.drawable.some_drawable));

但这也失败了，即使失败消息清楚地表明它是相同的Drawable被加载。

Answer 1

为背景

ImageView imageView = (ImageView) activity.findViewById(R.id.imageview);
assertEquals(R.drawable.expected, Robolectric.shadowOf(imageView.getBackground()).getCreatedFromResId());

对于Drawable

ImageView imageView = (ImageView) activity.findViewById(R.id.imageview);
assertEquals(R.drawable.expected, Robolectric.shadowOf(imageView.getDrawable()).getCreatedFromResId());

Answer 2

来自Robolectric 3.0+

这是你可以做的：

int drawableResId = Shadows.shadowOf(errorImageView.getDrawable()).getCreatedFromResId();
assertThat("error image drawable", R.drawable.ic_sentiment_dissatisfied_white_144dp, is(equalTo(drawableResId)));

Answer 3

我最终扩展了fest-android来解决这个问题：

public class CustomImageViewAssert extends ImageViewAssert {

    protected CustomImageViewAssert(ImageView actual) {
        super(actual);
    }

    public CustomImageViewAssert hasDrawableWithId(int resId) {
        boolean hasDrawable = hasDrawableResourceId(actual.getDrawable(), resId);
        String errorMessage = String.format("Expected ImageView to have drawable with id <%d>", resId);
        Assertions.assertThat(hasDrawable).overridingErrorMessage(errorMessage).isTrue();
        return this;
    }

    private static boolean hasDrawableResourceId(Drawable drawable, int expectedResId) {
        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
        Bitmap bitmap = bitmapDrawable.getBitmap();
        ShadowBitmap shadowBitmap = (ShadowBitmap) shadowOf(bitmap);
        int loadedFromResourceId = shadowBitmap.getCreatedFromResId();
        return expectedResId == loadedFromResourceId;
    }
}

神奇的酱油是：

ShadowBitmap shadowBitmap = (ShadowBitmap) shadowOf(bitmap);
int loadedFromResourceId = shadowBitmap.getCreatedFromResId();

这是Robolectric特有的，所以我无法向fest-android提交拉取请求。