[Carousel] Added tests for hero and multibrowse strategies when the c…

…arousel container is very small. PiperOrigin-RevId: 568855070
material-components · Oct 2, 2023 · 8312162 · 8312162
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diff --git a/lib/javatests/com/google/android/material/carousel/HeroCarouselStrategyTest.java b/lib/javatests/com/google/android/material/carousel/HeroCarouselStrategyTest.java
@@ -78,6 +78,23 @@ public void testItemSmallerThanContainer_showsOneLargeOneSmall() {
     assertThat(keylineState.getKeylines().get(2).maskedItemSize).isEqualTo(minSmallItemSize);
   }
 
+  @Test
+  public void testSmallContainer_shouldShowOneLargeItem() {
+    View view = createViewWithSize(ApplicationProvider.getApplicationContext(), 100, 400);
+    float minSmallItemSize =
+        view.getResources().getDimension(R.dimen.m3_carousel_small_item_size_min);
+    // Create a carousel that will not fit a large and small item where the large item is at least
+    // as big as the min small item.
+    int carouselWidth = (int) (minSmallItemSize * 1.5f);
+    Carousel carousel = createCarouselWithWidth(carouselWidth);
+
+    HeroCarouselStrategy config = new HeroCarouselStrategy();
+    KeylineState keylineState = config.onFirstChildMeasuredWithMargins(carousel, view);
+
+    assertThat(keylineState.getKeylines()).hasSize(3);
+    assertThat(keylineState.getKeylines().get(1).maskedItemSize).isEqualTo((float) carouselWidth);
+  }
+
   @Test
   public void testKnownArrangement_correctlyCalculatesKeylineLocations() {
     View view = createViewWithSize(ApplicationProvider.getApplicationContext(), 400, 200);

diff --git a/lib/javatests/com/google/android/material/carousel/MultiBrowseCarouselStrategyTest.java b/lib/javatests/com/google/android/material/carousel/MultiBrowseCarouselStrategyTest.java
@@ -76,6 +76,24 @@ public void testItemLargerThanContainerSize_defaultsToOneLargeOneSmall() {
     assertThat(keylineState.getKeylines().get(2).maskedItemSize).isEqualTo(minSmallItemSize);
   }
 
+
+  @Test
+  public void testSmallContainer_shouldShowOneLargeItem() {
+    View view = createViewWithSize(ApplicationProvider.getApplicationContext(), 100, 400);
+    float minSmallItemSize =
+        view.getResources().getDimension(R.dimen.m3_carousel_small_item_size_min);
+    // Create a carousel that will not fit a large and small item where the large item is at least
+    // as big as the min small item.
+    int carouselWidth = (int) (minSmallItemSize * 1.5f);
+    Carousel carousel = createCarouselWithWidth(carouselWidth);
+
+    MultiBrowseCarouselStrategy config = new MultiBrowseCarouselStrategy();
+    KeylineState keylineState = config.onFirstChildMeasuredWithMargins(carousel, view);
+
+    assertThat(keylineState.getKeylines()).hasSize(3);
+    assertThat(keylineState.getKeylines().get(1).maskedItemSize).isEqualTo((float) carouselWidth);
+  }
+
   @Test
   public void testKnownArrangementWithMediumItem_correctlyCalculatesKeylineLocations() {
     float[] locOffsets = new float[] {-.5F, 100F, 300F, 464F, 556F, 584.5F};