Started on the game logic

src/game/Game.test.ts

@@ -0,0 +1,48 @@
+import "jest"
+import {Game, SelectionMode} from "./Game"
+
+describe("GameState", () => {
+    const threeByThreeMatrix = [
+        "00", "10", "20",
+        "01", "11", "21",
+        "02", "12", "22",
+    ]
+
+    test("getting size works", () => {
+        expect((new Game([])).size).toEqual(0)
+        expect((new Game(["00"])).size).toEqual(1)
+        expect((new Game([
+                            "00", "01",
+                            "10", "11",
+                         ])).size).toEqual(2)
+    });
+
+    test("getting cell works", () => {
+        const game = new Game(threeByThreeMatrix);
+        expect(game.getCell(0, 2)).toEqual("02")
+    });
+    
+    describe("picking", () => {
+        test("starts with free pick", () => {
+            const game = new Game([]);
+            expect(game.state).toEqual({selectionMode: SelectionMode.FreePick})
+        });
+    
+        test("picking cells works", () => {
+            const game = new Game(threeByThreeMatrix);
+            game.pick(0, 0);
+            expect(game.state).toEqual({selectionMode: SelectionMode.RowPick, column: 0});
+            expect(() => game.pick(0, 2)).toThrow();
+            game.pick(2, 0);
+            expect(game.state).toEqual({selectionMode: SelectionMode.ColumnPick, row: 2});
+        });
+
+        test("picking outside of range fails", () => {
+            const game = new Game(threeByThreeMatrix);
+            expect(() => game.pick(-1, 0)).toThrow();
+            expect(() => game.pick(0, -1)).toThrow();
+            expect(() => game.pick(3, 0)).toThrow();
+            expect(() => game.pick(0, 3)).toThrow();
+        });
+    });
+});