wip: code formatting nits continued

test/once.spec.js

@@ -0,0 +1,35 @@
+import { _ } from './utils';
+
+describe('once', () => {
+    it('should invoke `func` once', () => {
+        let count = 0;
+        const once = _.once(() => ++count);
+
+        once();
+        expect(once()).toBe(1);
+        expect(count).toBe(1);
+    });
+
+    it('should ignore recursive calls', () => {
+        let count = 0;
+
+        var once = _.once(() => {
+            once();
+            return ++count;
+        });
+
+        expect(once()).toBe(1);
+        expect(count).toBe(1);
+    });
+
+    it('should not throw more than once', () => {
+        const once = _.once(() => {
+            throw new Error();
+        });
+
+        assert.throws(once);
+
+        once();
+        expect(true);
+    });
+});