1 files changed, 99 insertions, 0 deletions
diff --git a/src/world/lattice.test.js b/src/world/lattice.test.js
new file mode 100644
index 0000000..7c71d04
--- /dev/null
+++ b/src/world/lattice.test.js
@@ -0,0 +1,99 @@
+'use strict';
+
+import { lattice_update, lattice_valid, lattice_apply } from './lattice.js';
+
+
+test("growth update rule", () => {
+  const lattice = [[ 
+    { type: 'empty', flags: {} }, 
+    { type: 'empty', flags: {} }, 
+    { type: 'plant', flags: {} },
+  ]];
+  const update_rules = {
+    plant: () => {},
+    empty: (lattice, x, y) => {
+      if (lattice[y][x+1].type === 'plant') {
+        return { world_updates: [{ x, y, from: 'empty', to: 'plant' }] };
+      }
+    },
+  };
+
+  expect(lattice_update(lattice, update_rules)).toEqual([
+    { world_updates: [{ x: 1, y: 0, from: 'empty', to: 'plant' }] },
+  ]);
+
+  lattice[0][1] = { type: 'plant' };
+
+  expect(lattice_update(lattice, update_rules)).toEqual([
+    { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'plant' }] },
+  ]);
+
+  lattice[0][0] = { type: 'plant' };
+
+  expect(lattice_update(lattice, update_rules)).toEqual([]);
+});
+
+
+test("growth update rule applied", () => {
+  const lattice = [[ 
+    { type: 'empty', flags: {} }, 
+    { type: 'empty', flags: {} }, 
+    { type: 'plant', flags: {} },
+  ]];
+  expect(lattice_apply(lattice, [{ world_updates:[{ x: 1, y: 0, from: 'empty', to: 'plant' }]}])).toEqual([[
+    { type: 'empty', flags: {} }, 
+    { type: 'plant', flags: {} }, 
+    { type: 'plant', flags: {} },
+  ]]);
+
+  expect(lattice_apply(lattice, [
+    { 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', flags: {} }, 
+    { type: 'plant', flags: {} }, 
+    { type: 'empty', flags: {} },
+  ]]);
+});
+
+
+test("check proposals agains lattice for validity", () => {
+  const lattice = [[ { type: 'empty' }, { type: 'empty' }, { type: 'plant' } ]];
+  expect(lattice_valid(lattice, { world_updates: [{ x: -1, y: 0, from: 'blah', to: 'blah' }] })).toBe(false);
+  expect(lattice_valid(lattice, { world_updates: [{ x: 0, y: 0, from: 'blah', to: 'blah' }] })).toBe(false);
+  expect(lattice_valid(lattice, { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'blah' }] })).toBe(true);
+  expect(lattice_valid(lattice, { world_updates: [{ x: 2, y: 0, from: 'empty', to: 'blah' }] })).toBe(false);
+  expect(lattice_valid(lattice, { world_updates: [{ x: 2, y: 1, from: 'empty', to: 'blah' }] })).toBe(false);
+});
+
+
+test("proposals update cell flags appropriately", () => {
+  const lattice = [
+    [ 
+      { type: 'empty', flags: { step: 1} }, 
+      { type: 'empty', flags: {} }, 
+      { type: 'plant', flags: { foo: 'bar' } },
+    ]
+  ];
+
+  // flags are reset each time step
+  expect(lattice_apply(lattice, [{ world_updates:[{ x: 1, y: 0, from: 'empty', to: 'plant' }]}])).toEqual([[
+    { type: 'empty', flags: {} }, 
+    { type: 'plant', flags: {} }, 
+    { type: 'plant', flags: {} },
+  ]]);
+
+  // flags are combined when updating
+  expect(lattice_apply(lattice, [
+    { world_updates: [{ x: 1, y: 0, flags: { foo: 'bar' } } ]},
+    { world_updates: [{ x: 1, y: 0, from: 'empty', to: 'plant', flags: { baz: 'baz' } } ]},
+    { world_updates: [{ x: 0, y: 0, from: 'empty', to: 'plant', flags: { foo: 'foo' } } ]},
+    { world_updates: [{ x: 0, y: 0, flags: { beep: 'boop' } } ]},
+  ])).toEqual([[
+    { type: 'plant', flags: { foo: 'foo', beep: 'boop' } }, 
+    { type: 'plant', flags: { foo: 'bar', baz: 'baz' } }, 
+    { type: 'plant', flags: {} },
+  ]]);
+
+});