diff --git a/src/logic/sort.js b/src/logic/sort.js
index 73ed026..c5ee979 100644
--- a/src/logic/sort.js
+++ b/src/logic/sort.js
@@ -1,14 +1,14 @@
 import { getIn } from '../utils/immutabilityHelpers.js'
+import naturalSort from 'javascript-natural-sort'
 
 /**
  * Sort the items of an array
- * @param {Array} array       The array to be sorted
- * @param {Path} path         Nested path to the property on which to sort the contents
- * @param {1 | -1} direction  Pass 1 to sort ascending, -1 to sort descending
+ * @param {Array} array           The array to be sorted
+ * @param {Path} [path=[]]        Nested path to the property on which to sort the contents
+ * @param {1 | -1} [direction=1]  Pass 1 to sort ascending, -1 to sort descending
  * @return {Array} Returns a sorted shallow copy of the array
  */
-// TODO: write unit tests for sortArray
-export function sortArray (array, path, direction) {
+export function sortArray (array, path = [], direction = 1) {
   function comparator (a, b) {
     const valueA = getIn(a, path)
     const valueB = getIn(b, path)
@@ -41,12 +41,11 @@ export function sortArray (array, path, direction) {
 
 /**
  * Sort the keys of an object
- * @param {Object} object     The object to be sorted
- * @param {1 | -1} direction  Pass 1 to sort ascending, -1 to sort descending
+ * @param {Object} object         The object to be sorted
+ * @param {1 | -1} [direction=1]  Pass 1 to sort ascending, -1 to sort descending
  * @return {Object} Returns a sorted shallow copy of the object
  */
-// TODO: write unit tests for sortObjectKeys
-export function sortObjectKeys (object, direction) {
+export function sortObjectKeys (object, direction = 1) {
   const keys = Object.keys(object)
   keys.sort((keyA, keyB) => {
     return direction * naturalSort(keyA, keyB)
diff --git a/src/logic/sort.test.js b/src/logic/sort.test.js
new file mode 100644
index 0000000..36e1ee7
--- /dev/null
+++ b/src/logic/sort.test.js
@@ -0,0 +1,34 @@
+import assert from 'assert'
+import { sortArray, sortObjectKeys } from './sort.js'
+
+describe('sort', () => {
+  
+  it('should sort array', () => {
+    assert.deepStrictEqual(sortArray([ 2, 3, 1 ]), [1, 2, 3])
+    assert.deepStrictEqual(sortArray([ 2, 3, 1 ], undefined, -1), [3, 2, 1])
+  })
+  
+  it('should sort array using natural sort', () => {
+    assert.deepStrictEqual(sortArray([ '10', '2', '1' ]), ['1', '2', '10'])
+  })
+
+  it('should sort array by nested properties', () => {
+    const a = {data: { value: 1 }}
+    const b = {data: { value: 2 }}
+    const c = {data: { value: 3 }}
+
+    assert.deepStrictEqual(sortArray([ b, c, a ], ['data', 'value']), [a, b, c])
+    assert.deepStrictEqual(sortArray([ b, a, c ], ['data', 'value']), [a, b, c])
+    assert.deepStrictEqual(sortArray([ b, a, c ], ['data', 'value'], 1), [a, b, c])
+    assert.deepStrictEqual(sortArray([ b, a, c ], ['data', 'value'], -1), [c, b, a])
+  })
+  
+  it('should sort object keys', () => {
+    const object = { b: 1, c: 1, a: 1 }
+
+    assert.deepStrictEqual(Object.keys(sortObjectKeys(object)), ['a', 'b', 'c'])
+    assert.deepStrictEqual(Object.keys(sortObjectKeys(object, 1)), ['a', 'b', 'c'])
+    assert.deepStrictEqual(Object.keys(sortObjectKeys(object, -1)), ['c', 'b', 'a'])
+  })
+
+})