RangeUtils: migrate logic from kbn to grafana/data (#27347)

packages/grafana-data/src/datetime/rangeutil.test.ts

@@ -0,0 +1,43 @@
+import { rangeUtil } from './index';
+
+describe('Range Utils', () => {
+  describe('relative time', () => {
+    it('should identify absolute vs relative', () => {
+      expect(
+        rangeUtil.isRelativeTimeRange({
+          from: '1234',
+          to: '4567',
+        })
+      ).toBe(false);
+      expect(
+        rangeUtil.isRelativeTimeRange({
+          from: 'now-5',
+          to: 'now',
+        })
+      ).toBe(true);
+    });
+  });
+
+  describe('describe_interval', () => {
+    it('falls back to seconds if input is a number', () => {
+      expect(rangeUtil.describeInterval('123')).toEqual({
+        sec: 1,
+        type: 's',
+        count: 123,
+      });
+    });
+
+    it('parses a valid time unt string correctly', () => {
+      expect(rangeUtil.describeInterval('123h')).toEqual({
+        sec: 3600,
+        type: 'h',
+        count: 123,
+      });
+    });
+
+    it('fails if input is invalid', () => {
+      expect(() => rangeUtil.describeInterval('123xyz')).toThrow();
+      expect(() => rangeUtil.describeInterval('xyz')).toThrow();
+    });
+  });
+});