add setting validator

test/shared/validators/setting.test.js

@@ -0,0 +1,25 @@
+import { expect } from "chai";
+import { validate } from '../../../src/shared/validators/setting';
+
+describe("setting validator", () => {
+  describe("unknown top keys", () => {
+    it('throws an error for unknown settings', () => {
+      let settings = { keymaps: {}, poison: 123 };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'poison');
+    })
+  });
+
+  describe("keymaps settings", () => {
+    it('throws an error for unknown operation', () => {
+      let settings = {
+        keymaps: {
+          a: { 'type': 'scroll.home' },
+          b: { 'type': 'poison.dressing' },
+        }
+      };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'poison.dressing');
+    });
+  });
+});