diff --git a/test/specs/unit/util.unit.js b/test/specs/unit/util.unit.js
index bdfd511..68a4903 100755
--- a/test/specs/unit/util.unit.js
+++ b/test/specs/unit/util.unit.js
@@ -3,6 +3,28 @@ const { expect } = require('chai');
 const util = require('../../../lib/util');
 
 describe('util.js', () => {
-  context('isSortedHiToLow()', () => {});
-  context('isSortedLowToHi()', () => {});
+  context('isSortedHiToLow()', () => {
+    it('returns false when list is ascending', () => {
+      const list = [123, 456];
+      const result = util.isSortedHiToLow(list);
+      expect(result).to.equal(false);
+    });
+    it('returns true when list is descending', () => {
+      const list = [456, 123];
+      const result = util.isSortedHiToLow(list);
+      expect(result).to.equal(true);
+    });
+  });
+  context('isSortedLowToHi()', () => {
+    it('returns true when list is ascending', () => {
+      const list = [123, 456];
+      const result = util.isSortedLowToHi(list);
+      expect(result).to.equal(true);
+    });
+    it('returns false when list is descending', () => {
+      const list = [456, 123];
+      const result = util.isSortedLowToHi(list);
+      expect(result).to.equal(false);
+    });
+  });
 });