get rid of global notify (#5355)

* [toasts] get rid of notify globals, refactor messageToasts for use by entire app

* [remove notify] use arrow func in ajax call

* fix lint + tests

* actually fix tests from messageToast refactor

* add 'test:one' npm script

* debugger

* [toasts] convert bootstrap flash messages to toasts in explore + sqllab

* [toasts][tests] import from right file

superset/assets/spec/javascripts/messageToasts/reducers/messageToasts_spec.js

@@ -0,0 +1,29 @@
+import { describe, it } from 'mocha';
+import { expect } from 'chai';
+
+import { ADD_TOAST, REMOVE_TOAST } from '../../../../src/messageToasts/actions';
+import messageToastsReducer from '../../../../src/messageToasts/reducers';
+
+describe('messageToasts reducer', () => {
+  it('should return initial state', () => {
+    expect(messageToastsReducer(undefined, {})).to.deep.equal([]);
+  });
+
+  it('should add a toast', () => {
+    expect(
+      messageToastsReducer([], {
+        type: ADD_TOAST,
+        payload: { text: 'test', id: 'id', type: 'test_type' },
+      }),
+    ).to.deep.equal([{ text: 'test', id: 'id', type: 'test_type' }]);
+  });
+
+  it('should add a toast', () => {
+    expect(
+      messageToastsReducer([{ id: 'id' }, { id: 'id2' }], {
+        type: REMOVE_TOAST,
+        payload: { id: 'id' },
+      }),
+    ).to.deep.equal([{ id: 'id2' }]);
+  });
+});