Add missing tests on CallType and make it internal.

features/call/api/src/main/kotlin/io/element/android/features/call/api/CallType.kt

@@ -31,10 +31,3 @@ sealed interface CallType : NodeInputs, Parcelable {
         }
     }
 }
-
-fun CallType.getSessionId(): SessionId? {
-    return when (this) {
-        is CallType.ExternalUrl -> null
-        is CallType.RoomCall -> sessionId
-    }
-}

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallTypeExtension.kt

@@ -0,0 +1,18 @@
+/*
+ * 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.features.call.impl.ui
+
+import io.element.android.features.call.api.CallType
+import io.element.android.libraries.matrix.api.core.SessionId
+
+fun CallType.getSessionId(): SessionId? {
+    return when (this) {
+        is CallType.ExternalUrl -> null
+        is CallType.RoomCall -> sessionId
+    }
+}

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/ElementCallActivity.kt

@@ -36,7 +36,6 @@ import dev.zacsweers.metro.Inject
 import io.element.android.compound.colors.SemanticColorsLightDark
 import io.element.android.features.call.api.CallType
 import io.element.android.features.call.api.CallType.ExternalUrl
-import io.element.android.features.call.api.getSessionId
 import io.element.android.features.call.impl.DefaultElementCallEntryPoint
 import io.element.android.features.call.impl.di.CallBindings
 import io.element.android.features.call.impl.pip.PictureInPictureEvents

features/call/impl/src/test/kotlin/io/element/android/features/call/ui/CallTypeTest.kt

@@ -0,0 +1,43 @@
+/*
+ * 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.features.call.ui
+
+import com.google.common.truth.Truth.assertThat
+import io.element.android.features.call.api.CallType
+import io.element.android.features.call.impl.ui.getSessionId
+import io.element.android.libraries.matrix.test.A_ROOM_ID
+import io.element.android.libraries.matrix.test.A_SESSION_ID
+import org.junit.Test
+
+class CallTypeTest {
+    @Test
+    fun `getSessionId returns null for ExternalUrl`() {
+        assertThat(CallType.ExternalUrl("aURL").getSessionId()).isNull()
+    }
+
+    @Test
+    fun `getSessionId returns the sessionId for RoomCall`() {
+        assertThat(
+            CallType.RoomCall(
+                sessionId = A_SESSION_ID,
+                roomId = A_ROOM_ID,
+            ).getSessionId()
+        ).isEqualTo(A_SESSION_ID)
+    }
+
+    @Test
+    fun `ExternalUrl stringification does not contain the URL`() {
+        assertThat(CallType.ExternalUrl("aURL").toString()).isEqualTo("ExternalUrl")
+    }
+
+    @Test
+    fun `RoomCall stringification does not contain the URL`() {
+        assertThat(CallType.RoomCall(A_SESSION_ID, A_ROOM_ID).toString())
+            .isEqualTo("RoomCall(sessionId=$A_SESSION_ID, roomId=$A_ROOM_ID)")
+    }
+}