[fix] Dimensions.get when called on the server

src/apis/Dimensions/__tests__/__snapshots__/index-test.js.snap

@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`apis/Dimensions get 1`] = `
+Object {
+  "fontScale": 1,
+  "height": 0,
+  "scale": 1,
+  "width": 0,
+}
+`;
+
+exports[`apis/Dimensions get 2`] = `
+Object {
+  "fontScale": 1,
+  "height": 768,
+  "scale": 1,
+  "width": 1024,
+}
+`;

src/apis/Dimensions/__tests__/index-test.js

@@ -3,6 +3,15 @@
 import Dimensions from '..';
 
 describe('apis/Dimensions', () => {
+  test('get', () => {
+    expect(Dimensions.get('screen')).toMatchSnapshot();
+    expect(Dimensions.get('window')).toMatchSnapshot();
+  });
+
+  test('set', () => {
+    expect(() => Dimensions.set({})).toThrow();
+  });
+
   test('addEventListener', () => {
     const handler = jest.fn();
     Dimensions.addEventListener('change', handler);

src/apis/Dimensions/index.js

@@ -78,7 +78,8 @@ export default class Dimensions {
   }
 }
 
+Dimensions._update();
+
 if (canUseDOM) {
-  Dimensions._update();
   window.addEventListener('resize', debounce(Dimensions._update, 16), false);
 }