diff --git a/lib/game/components/ball.dart b/lib/game/components/ball.dart
index daf5be63..42842f17 100644
--- a/lib/game/components/ball.dart
+++ b/lib/game/components/ball.dart
@@ -65,6 +65,10 @@ class Ball extends PositionBodyComponent<PinballGame, SpriteComponent> {
     }
   }
 
+  /// Modifies maskBits of [Ball] for collisions.
+  ///
+  /// Changes the [Filter] data for category and maskBits of the [Ball] to
+  /// collide with other objects of same bits and ignore others.
   void setMaskBits(int maskBits) {
     body.fixtures.first
       ..filterData.categoryBits = maskBits
diff --git a/lib/game/components/crossing_ramp.dart b/lib/game/components/crossing_ramp.dart
index 83af9b1a..25bed457 100644
--- a/lib/game/components/crossing_ramp.dart
+++ b/lib/game/components/crossing_ramp.dart
@@ -53,6 +53,7 @@ extension RampTypeX on RampType {
 /// Collisions with [RampArea] are listened by [RampAreaCallback].
 /// {@endtemplate}
 abstract class RampArea extends BodyComponent {
+  /// {@macro ramp_area}
   RampArea({
     required Vector2 position,
     required int categoryBits,
@@ -65,8 +66,13 @@ abstract class RampArea extends BodyComponent {
   final Vector2 _position;
   final int _categoryBits;
 
+  /// Mask of category bits for collision with [RampArea]
   int get categoryBits => _categoryBits;
+
+  /// The [Shape] of the [RampArea]
   Shape get shape;
+
+  /// Orientation of the [RampArea] entrance/exit
   RampOrientation get orientation;
 
   @override
diff --git a/lib/game/components/jetpack_ramp.dart b/lib/game/components/jetpack_ramp.dart
index 78102f8e..c53dc4d2 100644
--- a/lib/game/components/jetpack_ramp.dart
+++ b/lib/game/components/jetpack_ramp.dart
@@ -11,6 +11,7 @@ import 'package:pinball/game/game.dart';
 /// a ball gets into/out of the ramp.
 /// {@endtemplate}
 class JetpackRamp extends PositionComponent with HasGameRef<PinballGame> {
+  /// {@macro jetpack_ramp}
   JetpackRamp({
     required Vector2 position,
   })  : _position = position,
@@ -64,6 +65,7 @@ class JetpackRamp extends PositionComponent with HasGameRef<PinballGame> {
 /// inside [JetpackRamp].
 /// {@endtemplate}
 class JetpackRampArea extends RampArea {
+  /// {@macro jetpack_ramp_area}
   JetpackRampArea({
     required Vector2 position,
     double rotation = 0,
diff --git a/lib/game/components/sparky_ramp.dart b/lib/game/components/sparky_ramp.dart
index dfac15fd..19690371 100644
--- a/lib/game/components/sparky_ramp.dart
+++ b/lib/game/components/sparky_ramp.dart
@@ -1,4 +1,3 @@
-import 'dart:math' as math;
 import 'package:flame/components.dart';
 import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
@@ -12,6 +11,7 @@ import 'package:pinball/game/game.dart';
 /// a ball gets into/out of the ramp.
 /// {@endtemplate}
 class SparkyRamp extends PositionComponent with HasGameRef<PinballGame> {
+  /// {@macro sparky_ramp}
   SparkyRamp({
     required Vector2 position,
   })  : _position = position,
@@ -59,6 +59,7 @@ class SparkyRamp extends PositionComponent with HasGameRef<PinballGame> {
 /// inside [SparkyRamp].
 /// {@endtemplate}
 class SparkyRampArea extends RampArea {
+  /// {@macro sparky_ramp_area}
   SparkyRampArea({
     required Vector2 position,
     double rotation = 0,
@@ -99,6 +100,7 @@ class SparkyRampArea extends RampArea {
 /// gets into a [SparkyRampArea].
 /// {@endtemplate}
 class SparkyRampAreaCallback extends RampAreaCallback<SparkyRampArea> {
+  /// {@macro sparky_ramp_area_callback}
   SparkyRampAreaCallback() : super();
 
   /// Collection of balls inside [SparkyRamp].
diff --git a/tool/coverage.sh b/tool/coverage.sh
new file mode 100755
index 00000000..e34b0124
--- /dev/null
+++ b/tool/coverage.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# This script can be used to run flutter test for a given directory (defaults to the current directory)
+# It will exclude generated code and translations (mimicking the ci) and open the coverage report in a
+# new window once it has run successfully.
+#
+# To run in main project:
+# ./tool/coverage.sh
+#
+# To run in other directory:
+# ./tool/coverage.sh ./path/to/other/project
+
+set -e
+
+PROJECT_PATH="${1:-.}"
+PROJECT_COVERAGE=./coverage/lcov.info
+
+cd ${PROJECT_PATH}
+
+rm -rf coverage
+if grep -q "flutter:" pubspec.yaml; then
+    flutter --version
+    flutter test --no-pub --test-randomize-ordering-seed random --coverage -j 28
+else
+    dart --version
+    dart test --coverage=coverage && dart run coverage:format_coverage --lcov --in=coverage --out=coverage/lcov.info --packages=.packages --report-on=lib
+fi
+lcov --remove ${PROJECT_COVERAGE} -o ${PROJECT_COVERAGE} \
+    '**/*.g.dart' \
+    '**/l10n/*.dart' \
+    '**/l10n/**/*.dart' \
+    '**/main/bootstrap.dart' \
+    '**/*.gen.dart'
+genhtml ${PROJECT_COVERAGE} -o coverage | tee ./coverage/output.txt
+
+COV_LINE=$(tail -2 ./coverage/output.txt | head -1)
+SUB='100.0%'
+
+if [[ "$COV_LINE" == *"$SUB"* ]]; then
+    echo "The coverage is 100%"
+else
+    echo "Coverage is below 100%! Check the report to see which lines are not covered."
+    echo $COV_LINE
+    open ./coverage/index.html
+fi