Add unit test on RustLinkDesktopHandler

Add unit test on RustLinkMobileHandler
Add unit test on DefaultLinkNewDeviceEntryPoint

features/linknewdevice/impl/src/test/kotlin/io/element/android/features/linknewdevice/impl/DefaultLinkNewDeviceEntryPointTest.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2025 Element Creations 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.linknewdevice.impl
+
+import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import com.bumble.appyx.core.modality.BuildContext
+import com.bumble.appyx.testing.junit4.util.MainDispatcherRule
+import com.google.common.truth.Truth.assertThat
+import io.element.android.features.linknewdevice.api.LinkNewDeviceEntryPoint
+import io.element.android.libraries.matrix.test.FakeMatrixClient
+import io.element.android.tests.testutils.lambda.lambdaError
+import io.element.android.tests.testutils.node.TestParentNode
+import kotlinx.coroutines.test.runTest
+import org.junit.Rule
+import org.junit.Test
+
+class DefaultLinkNewDeviceEntryPointTest {
+    @get:Rule
+    val instantTaskExecutorRule = InstantTaskExecutorRule()
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    @Test
+    fun `test node creation`() = runTest {
+        val entryPoint = DefaultLinkNewDeviceEntryPoint()
+        val client = FakeMatrixClient()
+        val parentNode = TestParentNode.create { buildContext, plugins ->
+            LinkNewDeviceFlowNode(
+                buildContext = buildContext,
+                plugins = plugins,
+                sessionCoroutineScope = backgroundScope,
+                linkNewMobileHandler = LinkNewMobileHandler(client),
+                linkNewDesktopHandler = LinkNewDesktopHandler(client),
+            )
+        }
+        val callback: LinkNewDeviceEntryPoint.Callback = object : LinkNewDeviceEntryPoint.Callback {
+            override fun onDone() = lambdaError()
+        }
+        val result = entryPoint.createNode(parentNode, BuildContext.root(null), callback)
+        assertThat(result).isInstanceOf(LinkNewDeviceFlowNode::class.java)
+    }
+}