Merge "Add tests for null views in animateReorder" into main

import org.junit.runner.RunWith;

import org.mockito.Mock;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import java.util.function.IntSupplier;

        verify(mFloatingContentCoordinator, times(1)).onContentRemoved(any());

    }

    @Test

    public void testAnimateReorder_swappedWithNullView_doesNotCrash() {

        // This test verifies that animateReorder does not crash when the provided list of views

        // contains null elements and a reorder occurs.

        List<View> reorderedViews = new ArrayList<>();

        reorderedViews.add(mViews.get(mViews.size() - 1)); // Move the last view to the front.

        reorderedViews.add(null);                          // Add a null entry.

        // The test will fail if animateReorder() throws an exception.

        mStackController.animateReorder(reorderedViews, mock(Runnable.class));

    }

    /**

     * Checks every child view to make sure it's stacked at the given coordinates, off to the left

     * or right side depending on offset multiplier.