LightSensorService tests (wip)

test/data/light_sensor_service_test.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:lightmeter/data/light_sensor_service.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  late LightSensorService service;
+
+  const methodChannel = MethodChannel('system_feature');
+  // TODO: add event channel mock
+  //const eventChannel = EventChannel('light.eventChannel');
+
+  setUp(() {
+    service = const LightSensorService();
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(methodChannel, null);
+  });
+
+  group(
+    'hasSensor()',
+    () {
+      test('true', () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, null);
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, (methodCall) async {
+          switch (methodCall.method) {
+            case "sensor":
+              return true;
+            default:
+              return null;
+          }
+        });
+        expectLater(service.hasSensor(), completion(true));
+      });
+
+      test('false', () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, null);
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, (methodCall) async {
+          switch (methodCall.method) {
+            case "sensor":
+              return false;
+            default:
+              return null;
+          }
+        });
+        expectLater(service.hasSensor(), completion(false));
+      });
+      test('null', () async {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, null);
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(methodChannel, (methodCall) async {
+          switch (methodCall.method) {
+            case "sensor":
+              return null;
+            default:
+              return null;
+          }
+        });
+        expectLater(service.hasSensor(), completion(false));
+      });
+    },
+  );
+}