Remove class duplication.

libraries/matrixui/src/test/kotlin/io/element/android/libraries/matrix/ui/room/PowerLevelBaseRoomMemberComparatorTest.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ * Copyright 2024, 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.ui.room
+
+import io.element.android.libraries.matrix.api.core.UserId
+import io.element.android.libraries.matrix.test.A_USER_ID
+import io.element.android.libraries.matrix.test.A_USER_ID_2
+import io.element.android.libraries.matrix.test.A_USER_ID_3
+import io.element.android.libraries.matrix.test.A_USER_ID_4
+import io.element.android.libraries.matrix.test.A_USER_ID_5
+import io.element.android.libraries.matrix.test.room.aRoomMember
+import org.junit.Test
+
+class PowerLevelBaseRoomMemberComparatorTest {
+    @Test
+    fun `order is Admin, then Moderator, then User`() {
+        val memberList = listOf(
+            aRoomMember(userId = UserId("@admin:example.com"), powerLevel = 100),
+            aRoomMember(userId = UserId("@moderator:example.com"), powerLevel = 50),
+            aRoomMember(userId = UserId("@user:example.com"), powerLevel = 0),
+        ).shuffled()
+
+        val ordered = memberList.sortedWith(PowerLevelRoomMemberComparator())
+        assert(ordered[0].userId == UserId("@admin:example.com"))
+        assert(ordered[1].userId == UserId("@moderator:example.com"))
+        assert(ordered[2].userId == UserId("@user:example.com"))
+    }
+
+    @Test
+    fun `with the same power level, alphabetical ascending order for name is used`() {
+        val memberList = listOf(
+            aRoomMember(userId = A_USER_ID, displayName = "First - admin", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_2, displayName = "Second - admin", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_3, displayName = "Third - admin", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_4, displayName = "First - user", powerLevel = 0),
+            aRoomMember(userId = A_USER_ID_5, displayName = "Second - user", powerLevel = 0),
+        ).shuffled()
+
+        val ordered = memberList.sortedWith(PowerLevelRoomMemberComparator())
+        assert(ordered[0].userId == A_USER_ID)
+        assert(ordered[1].userId == A_USER_ID_2)
+        assert(ordered[2].userId == A_USER_ID_3)
+        assert(ordered[3].userId == A_USER_ID_4)
+        assert(ordered[4].userId == A_USER_ID_5)
+    }
+
+    @Test
+    fun `when no names are provided, alphabetical order uses user id`() {
+        val memberList = listOf(
+            aRoomMember(userId = A_USER_ID, displayName = "Z - LAST!", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_2, powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_3, powerLevel = 100),
+        ).shuffled()
+
+        val ordered = memberList.sortedWith(PowerLevelRoomMemberComparator())
+        assert(ordered[0].userId == A_USER_ID_2)
+        assert(ordered[1].userId == A_USER_ID_3)
+        assert(ordered[2].userId == A_USER_ID)
+    }
+
+    @Test
+    fun `unicode characters are simplified and compared, order ignores case`() {
+        val memberList = listOf(
+            aRoomMember(userId = A_USER_ID, displayName = "First", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_2, displayName = "Șecond", powerLevel = 100),
+            aRoomMember(userId = A_USER_ID_3, displayName = "third", powerLevel = 100),
+        ).shuffled()
+
+        val ordered = memberList.sortedWith(PowerLevelRoomMemberComparator())
+        assert(ordered[0].userId == A_USER_ID)
+        assert(ordered[1].userId == A_USER_ID_2)
+        assert(ordered[2].userId == A_USER_ID_3)
+    }
+}