add cell.js

1 files changed, 56 insertions, 0 deletions

diff --git a/src/world/cell.test.js b/src/world/cell.test.js
new file mode 100644
index 0000000..a3749e5
--- /dev/null
+++ b/src/world/cell.test.js
@@ -0,0 +1,56 @@
+'use strict';
+
+import { cells_update, cells_valid, cells_apply } from './cell.js';
+
+
+test("growth update rule", () => {
+  const cells = [[ { type: 'empty' }, { type: 'empty' }, { type: 'plant' } ]];
+  const update_rules = {
+    plant: () => {},
+    empty: (cells, x, y) => {
+      if (cells[y][x+1].type === 'plant') {
+        return { world_updates: [{ x, y, from: 'empty', to: 'plant' }] };
+      }
+    },
+  };
+
+  expect(cells_update(cells, update_rules)).toEqual([
+    { world_updates: [{ x: 1, y: 0, from: 'empty', to: 'plant' }] },
+  ]);
+
+  cells[0][1] = { type: 'plant' };
+
+  expect(cells_update(cells, update_rules)).toEqual([
+    { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'plant' }] },
+  ]);
+
+  cells[0][0] = { type: 'plant' };
+
+  expect(cells_update(cells, update_rules)).toEqual([]);
+});
+
+
+test("growth update rule applied", () => {
+  const cells = [[ { type: 'empty' }, { type: 'empty' }, { type: 'plant' } ]];
+  expect(cells_apply(cells, [{ world_updates:[{ x: 1, y: 0, from: 'empty', to: 'plant' }]}])).toEqual([
+    [ { type: 'empty' }, { type: 'plant' }, { type: 'plant' } ],
+  ]);
+
+  expect(cells_apply(cells, [
+    { world_updates: [{ x: 2, y: 0, from: 'plant', to: 'empty' } ]},
+    { world_updates: [{ x: 1, y: 0, from: 'empty', to: 'plant' } ]},
+    { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'plant' } ]},
+  ])).toEqual([
+    [ { type: 'plant' }, { type: 'plant' }, { type: 'empty' } ],
+  ]);
+});
+
+
+test("check proposals agains cells for validity", () => {
+  const cells = [[ { type: 'empty' }, { type: 'empty' }, { type: 'plant' } ]];
+  expect(cells_valid(cells, { world_updates: [{ x: -1, y: 0, from: 'blah', to: 'blah' }] })).toBe(false);
+  expect(cells_valid(cells, { world_updates: [{ x: 0, y: 0, from: 'blah', to: 'blah' }] })).toBe(false);
+  expect(cells_valid(cells, { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'blah' }] })).toBe(true);
+  expect(cells_valid(cells, { world_updates: [{ x: 2, y: 0, from: 'empty', to: 'blah' }] })).toBe(false);
+  expect(cells_valid(cells, { world_updates: [{ x: 2, y: 1, from: 'empty', to: 'blah' }] })).toBe(false);
+});