WMRUSTORE-38: Fix tests

Author: enotniy

mindbox/test/mindbox_test.dart

@@ -64,7 +64,7 @@ void main() {
   test('When SDK was initialized, getToken() should return token', () async {
     final completer = Completer<String>();
 
-    Mindbox.instance.getTokens((deviceToken) => completer.complete(deviceToken));
+    Mindbox.instance.getToken((deviceToken) => completer.complete(deviceToken));
 
     final validConfig = Configuration(
         domain: 'domain',
@@ -77,6 +77,22 @@ void main() {
     expect(await completer.future, equals('dummy-token'));
   });
 
+  test('When SDK was initialized, getTokens() should return tokens', () async {
+    final completer = Completer<String>();
+
+    Mindbox.instance.getTokens((deviceToken) => completer.complete(deviceToken));
+
+    final validConfig = Configuration(
+        domain: 'domain',
+        endpointIos: 'endpointIos',
+        endpointAndroid: 'endpointAndroid',
+        subscribeCustomerIfCreated: true);
+
+    Mindbox.instance.init(configuration: validConfig);
+
+    expect(await completer.future, equals('dummy-tokens'));
+  });
+
   test('When SDK was not initialized, getToken() should not return token',
       () async {
     final completer = Completer<String>();

mindbox_platform_interface/lib/src/types/mindbox_mock_method_call_handler.dart

@@ -17,6 +17,10 @@ Future mindboxMockMethodCallHandler(MethodCall methodCall) async {
       return Future.value('dummy-device-uuid');
     case 'getToken':
       return Future.value('dummy-token');
+    case 'getTokens':
+      return Future.value('dummy-tokens');
+    case 'getSdkVersion':
+      return Future.value('dummy-sdk-version');
     case 'executeSyncOperation':
       final String operationSystemName = methodCall.arguments[0];
       if (operationSystemName == 'dummy-validation-error') {
@@ -62,6 +66,6 @@ Future mindboxMockMethodCallHandler(MethodCall methodCall) async {
       }
       return Future.value('dummy-response');
     default:
-      return 'dummy-sdk-version';
+      return 'dummy-not-mocked';
   }
 }