Added tests.

Author: kelp404

.circleci/config.yml

@@ -0,0 +1,25 @@
+version: 2.0
+workflows:
+  version: 2
+  build:
+    jobs:
+      - node10
+      - node12
+jobs:
+  node10:
+    working_directory: ~/react-hooks-shared-state
+    docker:
+      - image: node:10.15.3
+    steps:
+      - checkout
+      - run: npm install
+      - run: npm test
+
+  node12:
+    working_directory: ~/react-hooks-shared-state
+    docker:
+      - image: node:12.1.0
+    steps:
+      - checkout
+      - run: npm install
+      - run: npm test

__tests__/lib/__snapshots__/shared-state.js.snap

@@ -0,0 +1,7 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`setState() is assign state and call setters. 1`] = `
+Object {
+  "test": true,
+}
+`;

__tests__/lib/shared-state.js

@@ -0,0 +1,18 @@
+const SharedState = require('../../lib/shared-state');
+
+test('setState() is assign state and call setters.', () => {
+  const shareState = new SharedState();
+  shareState.setters = [
+    {
+      path: 'test',
+      set: jest.fn()
+    },
+    {
+      set: jest.fn()
+    }
+  ];
+  shareState.setState({test: true});
+  expect(shareState.state).toMatchSnapshot();
+  expect(shareState.setters[0].set).toBeCalledWith(true);
+  expect(shareState.setters[1].set).toBeCalledWith({test: true});
+});

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "start": "./node_modules/webpack-dev-server/bin/webpack-dev-server.js",
     "build": "./node_modules/webpack/bin/webpack.js --env.mode=production",
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "./node_modules/jest/bin/jest.js --coverage",
     "ncu": "./node_modules/npm-check-updates/bin/ncu"
   },
   "repository": {