Start adding test

packages/camera/camera_android_camerax/android/src/test/java/io/flutter/plugins/camerax/CameraAndroidCameraxPluginTest.java

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+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.camerax;
+
+public class CameraAndroidCameraxPluginTest {
+
+    @Mock ActivityPluginBinding activityPluginBinding;
+    @Mock FlutterPluginBinding flutterPluginBinding;
+
+    @Test
+    public void onAttachedToActivity_setsLifecycleOwnerAsActivityIfLifecycleOwner() {
+        CameraAndroidCameraxPlugin plugin = new CameraAndroidCameraxPlugin();
+        Activity mockActivity = mock(Activity.class);
+
+        when(activityPluginBinding.getActivity()).thenReturn(mockActivity);
+
+        // Set plugin's pluginBinding.
+        plugin.onAttachedToEngine(flutterPluginBinding);
+
+        plugin.onAttachedToActivity(activityPluginBinding);
+    }
+
+    @Test
+    public void onAttachedToActivity_setsLifecycleOwnerAsProxyLifecycleProviderIfActivityNotLifecycleOwner() {
+
+    }
+}