Add unit test for GridItemDecoration

Signed-off-by: Stefan Niedermann <info@niedermann.it>

1 files changed, 3 insertions, 0 deletions

diff --git a/app/src/main/java/it/niedermann/owncloud/notes/main/items/grid/GridItemDecoration.java b/app/src/main/java/it/niedermann/owncloud/notes/main/items/grid/GridItemDecoration.java
index 2cfcee88..01743638 100644
--- a/app/src/main/java/it/niedermann/owncloud/notes/main/items/grid/GridItemDecoration.java
+++ b/app/src/main/java/it/niedermann/owncloud/notes/main/items/grid/GridItemDecoration.java
@@ -20,6 +20,9 @@ public class GridItemDecoration extends SectionItemDecoration {
 
     public GridItemDecoration(@NonNull ItemAdapter adapter, int spanCount, @Px int sectionLeft, @Px int sectionTop, @Px int sectionRight, @Px int sectionBottom, @Px int gutter) {
         super(adapter, sectionLeft, sectionTop, sectionRight, sectionBottom);
+        if(spanCount < 1) {
+            throw new IllegalArgumentException("Requires at least one span");
+        }
         this.spanCount = spanCount;
         this.adapter = adapter;
         this.gutter = gutter;