add selectOnKeyCodes prop, add tests

tests/unit/Keydown.spec.js

@@ -0,0 +1,44 @@
+import { mountDefault } from '../helpers';
+
+describe('Custom Keydown Handlers', () => {
+
+  it('can use the map-keydown prop to trigger custom behaviour', () => {
+    const onKeyDown = jest.fn();
+    const Select = mountDefault({
+      mapKeydown: (defaults, vm) => ({...defaults, 32: onKeyDown}),
+    });
+
+    Select.find({ref: 'search'}).trigger('keydown.space');
+
+    expect(onKeyDown.mock.calls.length).toBe(1);
+  });
+
+  it('selectOnKeyCodes should trigger a selection for custom keycodes', () => {
+    const Select = mountDefault({
+      selectOnKeyCodes: [32],
+    });
+
+    const spy = jest.spyOn(Select.vm, 'typeAheadSelect');
+
+    Select.find({ref: 'search'}).trigger('keydown.space');
+
+    expect(spy).toHaveBeenCalledTimes(1);
+  });
+
+  it('even works when combining selectOnKeyCodes with map-keydown', () => {
+    const onKeyDown = jest.fn();
+    const Select = mountDefault({
+      mapKeydown: (defaults, vm) => ({...defaults, 32: onKeyDown}),
+      selectOnKeyCodes: [9],
+    });
+
+    const spy = jest.spyOn(Select.vm, 'typeAheadSelect');
+
+    Select.find({ref: 'search'}).trigger('keydown.space');
+    expect(onKeyDown.mock.calls.length).toBe(1);
+
+    Select.find({ref: 'search'}).trigger('keydown.tab');
+    expect(spy).toHaveBeenCalledTimes(1);
+  });
+
+});