feat(timepicker2): worked on more rich time range support

public/test/specs/core/utils/datemath_specs.ts

@@ -70,7 +70,7 @@ describe("DateMath", () => {
     });
   });
 
-  describe.only('rounding', () => {
+  describe('rounding', () => {
     var now;
     var anchored;
 

public/test/specs/core/utils/rangeutil_specs.ts

@@ -0,0 +1,34 @@
+import {describe, beforeEach, it, sinon, expect} from 'test/lib/common'
+
+import rangeUtil = require('app/core/utils/rangeutil')
+import _  = require('lodash')
+import moment  = require('moment')
+
+describe("rangeUtil", () => {
+
+  describe("Can get range explained", () => {
+
+    it('should handle simple old expression with only amount and unit', () => {
+      var info = rangeUtil.describeTextRange('5m');
+      expect(info.display).to.be('Last 5 minutes')
+    });
+
+    it('should have singular when amount is 1', () => {
+      var info = rangeUtil.describeTextRange('1h');
+      expect(info.display).to.be('Last 1 hour')
+    });
+
+    it('should handle now/d', () => {
+      var info = rangeUtil.describeTextRange('now/d');
+      expect(info.display).to.be('The day so far');
+    });
+
+    it('should handle now/w', () => {
+      var info = rangeUtil.describeTextRange('now/w');
+      expect(info.display).to.be('Week to date');
+    });
+
+
+  });
+
+});