add conditional living logic

package.json

@@ -30,7 +30,6 @@
     "transform": {
       ".*": "<rootDir>/node_modules/babel-jest"
     },
-    "testDirectoryName": "src/test",
     "moduleFileExtensions": [
       "js"
     ]

src/components/Cell.js

@@ -1,10 +1,27 @@
 class Cell {
-  constructor() {
-    this.living = false;
+  constructor(living = false) {
+    this.living = living;
+    this.liveNeighbors = 0;
   }
   toggleLiving() {
     this.living = !this.living;
   }
+  addLiveNeighbor() {
+    this.liveNeighbors++;
+  }
+  setLiving() {
+    if (this.living && this.liveNeighbors !== 2 && this.liveNeighbors !== 3) {
+      return (this.living = false);
+    }
+    if (this.liveNeighbors === 3) {
+      return (this.living = true);
+    }
+  }
 }
 
+// as a stream -> cellStream = Stream(Cell, () => Cell(cellStream.isLiving()))
+// in this case GameField = { [x-y]: cellStream }
+// communicating with neighbors = filter for (Boolean(Cell.living)) -> Cell neighbors.addLivingNeighbor
+// controlling whether to call or not: filter for (Boolean(Cell.living) || Boolean(cell.liveNeighbors)) -> cellStream.next
+
 module.exports = Cell;

src/test/Cell.test.js

@@ -2,25 +2,45 @@ const Cell = require("../components/Cell");
 
 describe("Cell functionality", () => {
   test("dispatch toggleLiving state should mark living cell dead", () => {
+    const cell = new Cell(true);
+    cell.toggleLiving();
+    expect(cell.living).toEqual(false);
+  });
+  test("dispatch toggleLiving state should mark dead cell living", () => {
     const cell = new Cell();
     cell.toggleLiving();
     expect(cell.living).toEqual(true);
   });
-  test.todo("dispatch toggleLiving state should mark dead cell living");
-  test.todo(
-    "dispatch add Live Neighbor should increment live neighbors property"
-  );
-  test.todo(
-    "dispatch setLiving should determine life based on neighbors (for living cells)"
-  );
-  const livingFromLivingStates = new Array(8).map((_, i) =>
-    i === 2 || i === 3 ? true : false
-  );
-  test.todo(
-    "dispatch setLiving should determine life based on neighbors (for dead cells)"
-  );
-  const livingFromDeadStates = new Array(8).map((_, i) =>
-    i === 3 ? true : false
-  );
+  test("dispatch add Live Neighbor should increment live neighbors property", () => {
+    const cell = new Cell();
+    cell.addLiveNeighbor();
+    expect(cell.liveNeighbors).toEqual(1);
+  });
+
+  const livingFromLivingStates = new Array(8)
+    .fill()
+    .map((_, i) => (i === 2 || i === 3 ? true : false));
+
+  livingFromLivingStates.forEach((state, liveNeighbors) => {
+    test(`dispatch setLiving on live cell with ${liveNeighbors} neighbors should result in living = ${state}`, () => {
+      const cell = new Cell(true);
+      new Array(liveNeighbors).fill().forEach((_) => cell.addLiveNeighbor());
+      cell.setLiving();
+      expect(cell.living).toEqual(state);
+    });
+  });
+
+  const livingFromDeadStates = new Array(8)
+    .fill()
+    .map((_, i) => (i === 3 ? true : false));
+
+  livingFromDeadStates.forEach((state, liveNeighbors) => {
+    test(`dispatch setLiving on dead cell with ${liveNeighbors} neighbors should result in living = ${state}`, () => {
+      const cell = new Cell();
+      new Array(liveNeighbors).fill().forEach((_) => cell.addLiveNeighbor());
+      cell.setLiving();
+      expect(cell.living).toEqual(state);
+    });
+  });
   test.todo("dispatch setLiving should reset live neighbors");
 });