Test new helpers to set a flag in the game

src/helpers/set-flag.test.ts

@@ -0,0 +1,66 @@
+import { CellState, Field } from "@helpers/field";
+import { setFlag } from "@helpers/set-flag";
+
+const { empty: e, hidden: h, bomb: b, mark: m, weakMark: w } = CellState;
+
+describe("Set flag action", () => {
+  describe("Set flag to the cell check", () => {
+    it("Set flag to the non hidden cell should be ignored", () => {
+      const gameField: Field = [
+        [1, 1, e],
+        [b, 1, e],
+        [1, 1, e],
+      ];
+      const playerField: Field = [
+        [1, h, h],
+        [h, h, h],
+        [h, h, h],
+      ];
+
+      const newPlayerField = setFlag([0, 0], playerField, gameField);
+
+      expect(newPlayerField).toStrictEqual([
+        [1, h, h],
+        [h, h, h],
+        [h, h, h],
+      ]);
+    });
+    it("Set Flag action, simple 3*3 case", () => {
+      const gameField: Field = [
+        [1, 1, e],
+        [b, 1, e],
+        [1, 1, e],
+      ];
+
+      const playerField: Field = [
+        [h, h, h],
+        [h, h, h],
+        [h, h, h],
+      ];
+
+      const playerFieldAfterFirstClick = setFlag([0, 0], playerField, gameField);
+
+      expect(playerFieldAfterFirstClick).toStrictEqual([
+        [m, h, h],
+        [h, h, h],
+        [h, h, h],
+      ]);
+
+      const playerFieldAfterSecondClick = setFlag([0, 0], playerField, gameField);
+
+      expect(playerFieldAfterSecondClick).toStrictEqual([
+        [w, h, h],
+        [h, h, h],
+        [h, h, h],
+      ]);
+
+      const playerFieldAfterThirdClick = setFlag([0, 0], playerField, gameField);
+
+      expect(playerFieldAfterThirdClick).toStrictEqual([
+        [h, h, h],
+        [h, h, h],
+        [h, h, h],
+      ]);
+    });
+  });
+});