add some tests

.github/workflows/deploy.yml

@@ -37,9 +37,8 @@ jobs:
       - name: Install requirements
         run: npm install
 
-        # todo uncomment once tests are added
-      # - name: Run tests
-      #   run: npm test
+      - name: Run tests
+        run: npm test
 
       - name: Setup git config
         run: |

src/logic/centerIndexes.test.js

@@ -0,0 +1,52 @@
+import {centerIndexes} from "./centerIndexes";
+
+test("Given indexes in a grid, returns the indexes of the centered input indexes", () => {
+  const indexes = [11,15,17,20,21]
+
+  const centeredIndexes = centerIndexes(indexes, 5);
+
+  const expectedIndexes = [7,11,13,16,17]
+
+  expect(centeredIndexes).toEqual(expectedIndexes);
+});
+
+
+test("If the indexes can't be perfectly centered, errs towards the top left", () => {
+  const expectedIndexes = [8,13,14,15,20]
+
+  const indexesBottomLeft = [19,24,25,26,31]
+
+  expect(centerIndexes(indexesBottomLeft, 6)).toEqual(expectedIndexes);
+
+  const indexesBottomRight = [22,27,28,29,34]
+
+  expect(centerIndexes(indexesBottomRight, 6)).toEqual(expectedIndexes);
+
+  const indexesTopLeft = [1,6,7,8,13]
+
+  expect(centerIndexes(indexesTopLeft, 6)).toEqual(expectedIndexes);
+
+  const indexesTopRight = [4,9,10,11,16]
+
+  expect(centerIndexes(indexesTopRight, 6)).toEqual(expectedIndexes);
+});
+
+test("If the indexes are already centered up/down, will still center right/left", () => {
+  const indexes = [6,10,12,15,16]
+
+  const centeredIndexes = centerIndexes(indexes, 5);
+
+  const expectedIndexes = [7,11,13,16,17]
+
+  expect(centeredIndexes).toEqual(expectedIndexes);
+});
+
+test("If the indexes are already centered right/left, will still center up/down", () => {
+  const indexes = [12,16,18,21,22]
+
+  const centeredIndexes = centerIndexes(indexes, 5);
+
+  const expectedIndexes = [7,11,13,16,17]
+
+  expect(centeredIndexes).toEqual(expectedIndexes);
+});