feat: launch local-first Sudoku workbench

tests/state/session.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from "vitest";
+import {
+  createSession,
+  enterSelection,
+  eraseSelection,
+  maskValues,
+  valueForKey,
+} from "../../src/state/session";
+
+describe("play session", () => {
+  it("protects givens and toggles values and notes", () => {
+    const givens = [5, 0, 0, 0];
+    let state = createSession(givens);
+    state = enterSelection(state, new Set([0, 1]), "value", 3, givens);
+    expect(state.values).toEqual([5, 3, 0, 0]);
+    state = enterSelection(state, new Set([2]), "center", 2, givens);
+    state = enterSelection(state, new Set([2]), "center", 4, givens);
+    expect(maskValues(state.centerMarks[2]!, 4)).toEqual([2, 4]);
+    state = eraseSelection(state, new Set([0, 1]), "value", givens);
+    expect(state.values).toEqual([5, 0, 0, 0]);
+  });
+
+  it("maps keyboard symbols through hexadecimal-sized grids", () => {
+    expect(valueForKey("9", 9)).toBe(9);
+    expect(valueForKey("A", 16)).toBe(10);
+    expect(valueForKey("G", 16)).toBe(16);
+    expect(valueForKey("H", 16)).toBeNull();
+  });
+});