Organize our polyfills and standardize on core-js

1 files changed, 36 insertions, 0 deletions

diff --git a/spec/javascripts/polyfills/element_spec.js b/spec/javascripts/polyfills/element_spec.js
new file mode 100644
index 00000000000..ecaaf1907ea
--- /dev/null
+++ b/spec/javascripts/polyfills/element_spec.js
@@ -0,0 +1,36 @@
+import '~/commons/polyfills/element';
+
+describe('Element polyfills', function () {
+  beforeEach(() => {
+    this.element = document.createElement('ul');
+  });
+
+  describe('matches', () => {
+    it('returns true if element matches the selector', () => {
+      expect(this.element.matches('ul')).toBeTruthy();
+    });
+
+    it("returns false if element doesn't match the selector", () => {
+      expect(this.element.matches('.not-an-element')).toBeFalsy();
+    });
+  });
+
+  describe('closest', () => {
+    beforeEach(() => {
+      this.childElement = document.createElement('li');
+      this.element.appendChild(this.childElement);
+    });
+
+    it('returns the closest parent that matches the selector', () => {
+      expect(this.childElement.closest('ul').toString()).toBe(this.element.toString());
+    });
+
+    it('returns itself if it matches the selector', () => {
+      expect(this.childElement.closest('li').toString()).toBe(this.childElement.toString());
+    });
+
+    it('returns undefined if nothing matches the selector', () => {
+      expect(this.childElement.closest('.no-an-element')).toBeFalsy();
+    });
+  });
+});