Add Server Health Check (#1307)

* Add Server Health Check

* documentation

Author: dplewis

src/Parse.js

@@ -80,6 +80,16 @@ const Parse = {
     CoreManager.setLocalDatastoreController(controller);
   },
 
+  /**
+   * Returns information regarding the current server's health
+   *
+   * @returns {Promise}
+   * @static
+   */
+  getServerHealth() {
+    return CoreManager.getRESTController().request('GET', 'health');
+  },
+
   /**
    * @member {string} Parse.applicationId
    * @static

src/__tests__/Parse-test.js

@@ -161,6 +161,18 @@ describe('Parse module', () => {
     CoreManager.set('REQUEST_BATCH_SIZE', 20);
   });
 
+  it('getServerHealth', () => {
+    const controller = {
+      request: jest.fn(),
+      ajax: jest.fn(),
+    };
+    CoreManager.setRESTController(controller);
+    Parse.getServerHealth();
+    const [method, path] = controller.request.mock.calls[0];
+    expect(method).toBe('GET');
+    expect(path).toBe('health');
+  });
+
   it('_request', () => {
     const controller = {
       request: jest.fn(),