Add some simple JS testing snippets

vim/snippets/javascript.snippets

@@ -0,0 +1,30 @@
+snippet des "Describe (js)"
+	describe('${1:description}', () => {
+		$0
+	});
+
+snippet it "it (js)"
+	it('${1:description}', () => {
+		$0
+	});
+
+snippet bef "before each (js)"
+	beforeEach(() => {
+		$0
+	});
+
+snippet aft "after each (js)"
+	afterEach(() => {
+		$0
+	});
+
+snippet befa "before all (js)"
+	beforeAll(() => {
+		$0
+	});
+
+snippet afta "after all (js)"
+	afterAll(() => {
+		$0
+	});
+