Adding upstream version 1.2.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/debounce.js

@@ -0,0 +1,71 @@
+import { debounce } from '..';
+import { expect } from 'chai';
+
+/*global describe,it*/
+
+describe('debounce()', () => {
+	it('should debounce when used as a simple decorator', next => {
+		let c = {
+			calls: 0,
+			args: null,
+
+			@debounce
+			foo(...args) {
+				c.calls++;
+				c.args = args;
+				c.context = this;
+			}
+		};
+
+		expect(c).to.have.property('calls', 0);
+		c.foo(1);
+		expect(c).to.have.property('calls', 0);
+		c.foo(2);
+		c.foo(3);
+		setTimeout( () => {
+			expect(c).to.have.property('calls', 1);
+			expect(c.args).to.deep.equal([3]);
+			expect(c.context).to.equal(c);
+
+			next();
+		}, 20);
+	});
+
+	it('should debounce when used as a function', next => {
+		let c = debounce( (...args) => {
+				m.calls++;
+				m.args = args;
+			}),
+			m = { calls:0, args:null };
+
+		expect(m).to.have.property('calls', 0);
+		c(1);
+		expect(m).to.have.property('calls', 0);
+		c(2);
+		c(3);
+		setTimeout( () => {
+			expect(m).to.have.property('calls', 1);
+			expect(m.args).to.deep.equal([3]);
+
+			next();
+		}, 20);
+	});
+
+	it('should support passing a delay', next => {
+		let c = debounce(5, (...args) => {
+				m.calls.push(args);
+			}),
+			m = { calls:[] };
+
+		c(1);
+		setTimeout(()=> c(2), 1);
+		setTimeout(()=> c(3), 10);
+		setTimeout(()=> c(4), 14);
+		setTimeout(()=> c(5), 22);
+		expect(m.calls).to.have.length(0);
+		setTimeout( () => {
+			expect(m.calls).to.deep.equal([ [2], [4], [5] ]);
+			next();
+		}, 30);
+	});
+});