Basic Structure

package/lib/comprehension_measurement.dart

@@ -1,7 +1,2 @@
-library comprehension_measurement;
-
-/// A Calculator.
-class Calculator {
-  /// Returns [value] plus 1.
-  int addOne(int value) => value + 1;
-}
+export 'src/main.dart' show measureComprehension;
+export 'src/types/single_choice.dart' show SingleChoiceWidget;

package/lib/src/main.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+void measureComprehension(BuildContext context) {
+  showBottomSheet(
+    context: context,
+    backgroundColor: Colors.transparent,
+    builder: (BuildContext context) {
+      return Container(
+        margin: const EdgeInsets.all(8),
+        width: double.infinity,
+        child: Card(
+          elevation: 4,
+          shape:
+              RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+          child: const Text("Text"),
+        ),
+      );
+    },
+  );
+}

package/lib/src/types/single_choice.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/material.dart';
+
+class SingleChoiceWidget extends StatefulWidget {
+  const SingleChoiceWidget({Key? key}) : super(key: key);
+
+  @override
+  State<SingleChoiceWidget> createState() => _SingleChoiceWidgetState();
+}
+
+class _SingleChoiceWidgetState extends State<SingleChoiceWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return Container();
+  }
+}

package/test/comprehension_measurement_test.dart

@@ -3,10 +3,5 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:comprehension_measurement/comprehension_measurement.dart';
 
 void main() {
-  test('adds one to input values', () {
-    final calculator = Calculator();
-    expect(calculator.addOne(2), 3);
-    expect(calculator.addOne(-7), -6);
-    expect(calculator.addOne(0), 1);
-  });
+  // TODO: Add tests
 }