Add getCell and setCell method to Simulation

lib/src/Simulation.dart

@@ -72,6 +72,10 @@ class Simulation {
     return math.Point<int>(cx.toInt(), cy.toInt());
   }
 
+  bool getCell(int x, int y) => map.get(x, y);
+
+  void setCell(int x, int y, bool value) => map.set(x, y, value);
+
   void toggleCellState(int x, int y) {
     map.set(x, y, !map.get(x, y));
   }

test/simulation_test.dart

@@ -7,6 +7,8 @@ import 'package:test/test.dart';
 
 class MockGrid extends Mock implements Grid<bool> {}
 
+// TODO: reinstate when decoupling rendering from Simulation @Tags(const ["nobrowser"])
+
 void main() {
   Simulation sut;
   setUp(() {
@@ -25,7 +27,7 @@ void main() {
       var oldMap = sut.map;
       sut.gridSize = Point(10, 10);
       expect(sut.map, isNot(same(oldMap)));
-    }, tags: "nobrowser");
+    });
   });
   group("resetMap", () {
     test("sets the internal map filled with 'false' ", () {
@@ -38,7 +40,7 @@ void main() {
       sut.clearMap();
       expect(sut.dirty, true);
     });
-  }, tags: "nobrowser");
+  });
   group("save&load", () {
     test(
         "saves a copy of the map which does not change when the actual map changes",
@@ -49,20 +51,38 @@ void main() {
 
       expect(sut.loadSnapshot(), isNot(equals(snapshot)));
     });
-  }, tags: "nobrowser");
+  });
+  group("getCellState", () {
+    test("throws RangeError if outside map bounds", () {
+      expect(() => sut.getCell(9, 10), throwsRangeError);
+    });
+    test("returns cell value", () {
+      sut.map.set(1, 1, true);
+      expect(sut.getCell(1, 1), true);
+    });
+  });
+  group("setCellState", () {
+    test("throws RangeError if outside map bounds", () {
+      expect(() => sut.setCell(9, 10, true), throwsRangeError);
+    });
+    test("sets cell value", () {
+      sut.setCell(1, 1, true);
+      expect(sut.getCell(1, 1), true);
+    });
+  });
   group("toggleCellState", () {
     test("throws RangeError if outside the map bounds", () {
       expect(() => sut.toggleCellState(10, 9), throwsRangeError);
-    }, tags: const ["nobrowser"]);
+    });
     test("sets the cell to false if currently true", () {
       sut.map.set(1, 1, true);
       sut.toggleCellState(1, 1);
       expect(sut.map.get(1, 1), false);
-    }, tags: const ["nobrowser"]);
+    });
     test("sets the cell to true if currently false", () {
       sut.map.set(1, 1, false);
       sut.toggleCellState(1, 1);
       expect(sut.map.get(1, 1), true);
-    }, tags: const ["nobrowser"]);
+    });
   });
 }