From dad6c5c326f0f23dee307b0e00a154bd58e410c8 Mon Sep 17 00:00:00 2001
From: Ruben Sousa <ruben@rubensousa.com>
Date: Thu, 26 Sep 2024 00:43:03 +0200
Subject: [PATCH] Add new test for smooth scrolling changes of lookup

---
 .../tests/alignment/AlignmentLookupTest.kt    | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/alignment/AlignmentLookupTest.kt b/dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/alignment/AlignmentLookupTest.kt
index 9bf33d7f..e99910d0 100644
--- a/dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/alignment/AlignmentLookupTest.kt
+++ b/dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/alignment/AlignmentLookupTest.kt
@@ -186,4 +186,49 @@ class AlignmentLookupTest : DpadRecyclerViewTest() {
         assertThat(viewBounds.bottom).isEqualTo(recyclerViewBounds.bottom)
     }
 
+    @Test
+    fun testAlignmentLookupSmoothScrolling() = report {
+        Given("Launch Fragment with top alignment") {
+            launchFragment()
+        }
+
+        var scrolled = false
+        When("Set AlignmentLookup for 50% of screen height") {
+            onRecyclerView("Set alignment") { recyclerView ->
+                recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
+                    override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
+                        super.onScrollStateChanged(recyclerView, newState)
+                        if (newState != RecyclerView.SCROLL_STATE_IDLE) {
+                            scrolled = true
+                        }
+                    }
+                })
+                recyclerView.setAlignmentLookup(
+                    object : AlignmentLookup {
+                        override fun getParentAlignment(
+                            viewHolder: RecyclerView.ViewHolder,
+                        ): ParentAlignment {
+                            return ParentAlignment(fraction = 0.5f)
+                        }
+
+                        override fun getChildAlignment(
+                            viewHolder: RecyclerView.ViewHolder,
+                        ): ChildAlignment {
+                            return ChildAlignment(fraction = 0.5f)
+                        }
+                    },
+                    smooth = true
+                )
+            }
+        }
+
+        Then("RecyclerView scrolled to new position") {
+            waitForIdleScrollState()
+            val recyclerViewBounds = getRecyclerViewBounds()
+            val viewBounds = getItemViewBounds(position = 0)
+            assertThat(scrolled).isTrue()
+            assertThat(viewBounds.centerY()).isEqualTo(recyclerViewBounds.height() / 2)
+        }
+    }
+
 }