public void testDrawWithNUllCanvas() {
try {
mTransitionDrawable.draw(null);
fail("The method should check whether the canvas is null.");
} catch (NullPointerException e) {
}
}
private void assertTransitionStart(int colorFrom) {
mBitmap.eraseColor(0x00000000);
mTransitionDrawable.draw(mCanvas);
assertColorFillRect(mBitmap, 0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, colorFrom);
}