test(Utilities): test isMouseEvent

terminus-ui/utilities/src/type-coercion/is-mouse-event.spec.ts

@@ -0,0 +1,30 @@
+import { createMouseEvent } from '@terminus/ngx-tools/testing';
+
+import { isMouseEvent } from './is-mouse-event';
+
+
+describe(`isMouseEvent`, function() {
+
+  test(`should return true for mouse events`, function() {
+    const fakeMouseEvent = createMouseEvent('click');
+    expect(isMouseEvent(fakeMouseEvent)).toEqual(true);
+  });
+
+
+  test(`should return false for anything that is not a mouse event`, function() {
+    const badValues = [
+      null,
+      void 0,
+      1,
+      0,
+      'foo',
+      {},
+      '',
+    ];
+
+    for (const value of badValues) {
+      expect(isMouseEvent(value as any)).toEqual(false);
+    }
+  });
+
+});

terminus-ui/utilities/src/type-coercion/is-mouse-event.ts

@@ -9,5 +9,5 @@ import { isSet } from '@terminus/ngx-tools';
  */
 // tslint:disable-next-line no-any
 export function isMouseEvent(x: any): x is MouseEvent {
-  return isSet(x.relatedTarget);
+  return !!x && isSet(x.relatedTarget);
 }