diff --git a/libraries/matrixui/src/test/kotlin/io/element/android/libraries/matrix/ui/model/MatrixUserExtensionsTest.kt b/libraries/matrixui/src/test/kotlin/io/element/android/libraries/matrix/ui/model/MatrixUserExtensionsTest.kt
new file mode 100644
index 0000000000..fb02be96e7
--- /dev/null
+++ b/libraries/matrixui/src/test/kotlin/io/element/android/libraries/matrix/ui/model/MatrixUserExtensionsTest.kt
@@ -0,0 +1,78 @@
+/*
+ * Copyright 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.model
+
+import com.google.common.truth.Truth.assertThat
+import io.element.android.libraries.designsystem.components.avatar.AvatarData
+import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.matrix.test.A_USER_ID
+import org.junit.Test
+
+class MatrixUserExtensionsTest {
+    @Test
+    fun `getAvatarData should return the expected value`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = "displayName",
+            avatarUrl = "avatarUrl",
+        )
+        val expected = AvatarData(
+            id = A_USER_ID.value,
+            name = "displayName",
+            url = "avatarUrl",
+            size = AvatarSize.UserHeader,
+        )
+        assertThat(matrixUser.getAvatarData(AvatarSize.UserHeader)).isEqualTo(expected)
+    }
+
+    @Test
+    fun `getBestName should return the display name is available`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = "displayName",
+        )
+        assertThat(matrixUser.getBestName()).isEqualTo("displayName")
+    }
+
+    @Test
+    fun `getBestName should return the id when name is not available`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = null,
+        )
+        assertThat(matrixUser.getBestName()).isEqualTo(A_USER_ID.value)
+    }
+
+    @Test
+    fun `getBestName should return the id when name is empty`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = "",
+        )
+        assertThat(matrixUser.getBestName()).isEqualTo(A_USER_ID.value)
+    }
+
+    @Test
+    fun `getFullName should return the display name is available and the userId`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = "displayName",
+        )
+        assertThat(matrixUser.getFullName()).isEqualTo("displayName (@alice:server.org)")
+    }
+
+    @Test
+    fun `getBestName should return only the id when name is not available`() {
+        val matrixUser = MatrixUser(
+            userId = A_USER_ID,
+            displayName = null,
+        )
+        assertThat(matrixUser.getFullName()).isEqualTo(A_USER_ID.value)
+    }
+}