Fixed & tested exposure pairs list builder

lib/data/models/exposure_pair.dart

@@ -8,4 +8,16 @@ class ExposurePair {
 
   @override
   String toString() => '$aperture - $shutterSpeed';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    if (other.runtimeType != runtimeType) return false;
+    return other is ExposurePair &&
+        other.aperture == aperture &&
+        other.shutterSpeed == shutterSpeed;
+  }
+
+  @override
+  int get hashCode => Object.hash(aperture, shutterSpeed, runtimeType);
 }

lib/data/models/film.dart

@@ -13,6 +13,8 @@ double log10polynomian(
 ) =>
     a * pow(log10(x), 2) + b * log10(x) + c;
 
+typedef ReciprocityFailureBuilder = ShutterSpeedValue Function(ShutterSpeedValue shutterSpeed);
+
 /// Only Ilford films have reciprocity formulas provided by the manufacturer:
 /// https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf
 ///

lib/screens/metering/screen_metering.dart

@@ -30,7 +30,7 @@ class MeteringScreen extends StatelessWidget {
           children: [
             Expanded(
               child: BlocBuilder<MeteringBloc, MeteringState>(
-                builder: (_, state) => _MeteringContainerBuidler(
+                builder: (_, state) => MeteringContainerBuidler(
                   ev: state is MeteringDataState ? state.ev : null,
                   film: state.film,
                   iso: state.iso,
@@ -76,13 +76,6 @@ class _InheritedListeners extends StatelessWidget {
       onDidChangeDependencies: (value) {
         context.read<MeteringBloc>().add(EquipmentProfileChangedEvent(value));
       },
-      child: InheritedModelAspectListener<MeteringScreenLayoutFeature, bool>(
-        aspect: MeteringScreenLayoutFeature.equipmentProfiles,
-        onDidChangeDependencies: (value) {
-          if (!value) {
-            EquipmentProfileProvider.of(context).setProfile(context.get<EquipmentProfiles>().first);
-          }
-        },
       child: InheritedModelAspectListener<MeteringScreenLayoutFeature, bool>(
         aspect: MeteringScreenLayoutFeature.filmPicker,
         onDidChangeDependencies: (value) {
@@ -90,6 +83,14 @@ class _InheritedListeners extends StatelessWidget {
             context.read<MeteringBloc>().add(const FilmChangedEvent(Film.other()));
           }
         },
+        child: InheritedModelAspectListener<MeteringScreenLayoutFeature, bool>(
+          aspect: MeteringScreenLayoutFeature.equipmentProfiles,
+          onDidChangeDependencies: (value) {
+            if (!value) {
+              EquipmentProfileProvider.of(context)
+                  .setProfile(context.get<EquipmentProfiles>().first);
+            }
+          },
           child: child,
         ),
       ),
@@ -97,7 +98,7 @@ class _InheritedListeners extends StatelessWidget {
   }
 }
 
-class _MeteringContainerBuidler extends StatelessWidget {
+class MeteringContainerBuidler extends StatelessWidget {
   final double? ev;
   final Film film;
   final IsoValue iso;
@@ -106,7 +107,7 @@ class _MeteringContainerBuidler extends StatelessWidget {
   final ValueChanged<IsoValue> onIsoChanged;
   final ValueChanged<NdValue> onNdChanged;
 
-  const _MeteringContainerBuidler({
+  const MeteringContainerBuidler({
     required this.ev,
     required this.film,
     required this.iso,
@@ -118,7 +119,14 @@ class _MeteringContainerBuidler extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final exposurePairs = ev != null ? buildExposureValues(context, ev!, film) : <ExposurePair>[];
+    final exposurePairs = ev != null
+        ? buildExposureValues(
+            ev!,
+            context.listen<StopType>(),
+            context.listen<EquipmentProfile>(),
+            film,
+          )
+        : <ExposurePair>[];
     final fastest = exposurePairs.isNotEmpty ? exposurePairs.first : null;
     final slowest = exposurePairs.isNotEmpty ? exposurePairs.last : null;
     return context.listen<EvSourceType>() == EvSourceType.camera
@@ -146,28 +154,30 @@ class _MeteringContainerBuidler extends StatelessWidget {
           );
   }
 
-  List<ExposurePair> buildExposureValues(BuildContext context, double ev, Film film) {
+  @visibleForTesting
+  static List<ExposurePair> buildExposureValues(
+    double ev,
+    StopType stopType,
+    EquipmentProfile equipmentProfile,
+    Film film,
+  ) {
     if (ev.isNaN || ev.isInfinite) {
       return List.empty();
     }
 
     /// Depending on the `stopType` the exposure pairs list length is multiplied by 1,2 or 3
-    final StopType stopType = context.listen<StopType>();
     final int evSteps = (ev * (stopType.index + 1)).round();
 
-    final EquipmentProfile equipmentProfile = context.listen<EquipmentProfile>();
+    final apertureValues = ApertureValue.whereStopType(stopType);
-    final List<ApertureValue> apertureValues =
+    final shutterSpeedValues = ShutterSpeedValue.whereStopType(stopType);
-        equipmentProfile.apertureValues.whereStopType(stopType);
-    final List<ShutterSpeedValue> shutterSpeedValues =
-        equipmentProfile.shutterSpeedValues.whereStopType(stopType);
 
     /// Basically we use 1" shutter speed as an anchor point for building the exposure pairs list.
     /// But user can exclude this value from the list using custom equipment profile.
     /// So we have to restore the index of the anchor value.
-    const ShutterSpeedValue anchorShutterSpeed = ShutterSpeedValue(1, false, StopType.full);
+    const anchorShutterSpeed = ShutterSpeedValue(1, false, StopType.full);
     int anchorIndex = shutterSpeedValues.indexOf(anchorShutterSpeed);
     if (anchorIndex < 0) {
-      final filteredFullList = ShutterSpeedValue.values.whereStopType(stopType);
+      final filteredFullList = ShutterSpeedValue.whereStopType(stopType);
       final customListStartIndex = filteredFullList.indexOf(shutterSpeedValues.first);
       final fullListAnchor = filteredFullList.indexOf(anchorShutterSpeed);
       if (customListStartIndex < fullListAnchor) {
@@ -200,7 +210,8 @@ class _MeteringContainerBuidler extends StatelessWidget {
     if (itemsCount < 0) {
       return List.empty();
     }
-    return List.generate(
+
+    final exposurePairs = List.generate(
       itemsCount,
       (index) => ExposurePair(
         apertureValues[index + apertureOffset],
@@ -208,5 +219,30 @@ class _MeteringContainerBuidler extends StatelessWidget {
       ),
       growable: false,
     );
+
+    /// Full equipment profile, nothing to cut
+    if (equipmentProfile.id == "") {
+      return exposurePairs;
+    }
+
+    final equipmentApertureValues = equipmentProfile.apertureValues.whereStopType(stopType);
+    final equipmentShutterSpeedValues = equipmentProfile.shutterSpeedValues.whereStopType(stopType);
+
+    final startCutEV = max(
+      exposurePairs.first.aperture.difference(equipmentApertureValues.first),
+      exposurePairs.first.shutterSpeed.difference(equipmentShutterSpeedValues.first),
+    );
+    final endCutEV = max(
+      equipmentApertureValues.last.difference(exposurePairs.last.aperture),
+      equipmentShutterSpeedValues.last.difference(exposurePairs.last.shutterSpeed),
+    );
+
+    final startCut = (startCutEV * (stopType.index + 1)).round().clamp(0, itemsCount);
+    final endCut = (endCutEV * (stopType.index + 1)).round().clamp(0, itemsCount);
+
+    if (startCut > itemsCount - endCut) {
+      return const [];
+    }
+    return exposurePairs.sublist(startCut, itemsCount - endCut);
   }
 }

test/screens/metering/screen_metering_test.dart

@@ -0,0 +1,646 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:lightmeter/data/models/exposure_pair.dart';
+import 'package:lightmeter/data/models/film.dart';
+import 'package:lightmeter/screens/metering/screen_metering.dart';
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
+void main() {
+  const defaultEquipmentProfile = EquipmentProfileData(
+    id: "",
+    name: 'Default',
+    apertureValues: ApertureValue.values,
+    ndValues: NdValue.values,
+    shutterSpeedValues: ShutterSpeedValue.values,
+    isoValues: IsoValue.values,
+  );
+
+  group('Empty list', () {
+    List<ExposurePair> exposurePairsFull(double ev) => MeteringContainerBuidler.buildExposureValues(
+          ev,
+          StopType.full,
+          defaultEquipmentProfile,
+          const Film.other(),
+        );
+
+    test('isNan', () {
+      expect(exposurePairsFull(double.nan), const []);
+    });
+
+    test('isInifinity', () {
+      expect(exposurePairsFull(double.infinity), const []);
+    });
+  });
+
+  group('Default equipment profile', () {
+    group("StopType.full", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.full,
+            defaultEquipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(4, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(8, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(4, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(8, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(4, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(8, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+    });
+
+    group("StopType.half", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.half,
+            defaultEquipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(3, true, StopType.half),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(6.7, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(3, true, StopType.half),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(6.7, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(3, true, StopType.half),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(6.7, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(4, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(8, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+    });
+
+    group("StopType.third", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.third,
+            defaultEquipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(2.5, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(6.3, StopType.third),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(3, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(7.1, StopType.third),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(3, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(7.1, StopType.third),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1, StopType.full),
+            ShutterSpeedValue(4, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(8, StopType.full),
+            ShutterSpeedValue(16, false, StopType.full),
+          ),
+        );
+      });
+    });
+  });
+
+  group('Reduced equipment profile', () {
+    final equipmentProfile = EquipmentProfileData(
+      id: "1",
+      name: 'Test1',
+      apertureValues: ApertureValue.values.sublist(4),
+      ndValues: NdValue.values,
+      shutterSpeedValues: ShutterSpeedValue.values.sublist(0, ShutterSpeedValue.values.length - 4),
+      isoValues: IsoValue.values,
+    );
+
+    group("StopType.full", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.full,
+            equipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1, false, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1, false, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+    });
+
+    group("StopType.half", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.half,
+            equipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1, false, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4.0, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.5, true, StopType.half),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4.8, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.5, true, StopType.half),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4.8, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.5, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4.8, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+    });
+
+    group("StopType.third", () {
+      List<ExposurePair> exposurePairsFull(double ev) =>
+          MeteringContainerBuidler.buildExposureValues(
+            ev,
+            StopType.third,
+            equipmentProfile,
+            const Film.other(),
+          );
+
+      test('EV 1', () {
+        final exposurePairs = exposurePairsFull(1);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1, false, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.3', () {
+        final exposurePairs = exposurePairsFull(1.3);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.3, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(4.5, StopType.third),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.5', () {
+        final exposurePairs = exposurePairsFull(1.5);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.6, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.0, StopType.third),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 1.7', () {
+        final exposurePairs = exposurePairsFull(1.7);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(1.6, true, StopType.third),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.0, StopType.third),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+
+      test('EV 2', () {
+        final exposurePairs = exposurePairsFull(2);
+        expect(
+          exposurePairs.first,
+          const ExposurePair(
+            ApertureValue(1.4, StopType.full),
+            ShutterSpeedValue(2, true, StopType.full),
+          ),
+        );
+        expect(
+          exposurePairs.last,
+          const ExposurePair(
+            ApertureValue(5.6, StopType.full),
+            ShutterSpeedValue(8, false, StopType.full),
+          ),
+        );
+      });
+    });
+  });
+}