test(dart): add test cases for open issues

tests/indent/dart/class.dart

@@ -1,4 +1,8 @@
 void main() {
 }
+
 class Test {
+  List<String> get progress => [
+        '0',
+      ];
 }

tests/indent/dart/class_function_argument.dart

@@ -0,0 +1,13 @@
+class Something {
+  final int number;
+  final Function(int) write;
+
+  Something(this.number, this.write);
+}
+
+void test() {
+  Something(
+    1,
+    (int number) {
+  );
+}

tests/indent/dart/switch.dart

@@ -0,0 +1,9 @@
+void test() {
+  final a = 69;
+  switch (a) {
+    case 69:
+      break;
+    case 420:
+    default:
+  }
+}