diff --git a/tests/jsPsych.utils/utils.test.js b/tests/jsPsych.utils/utils.test.js
new file mode 100644
index 00000000..506fe536
--- /dev/null
+++ b/tests/jsPsych.utils/utils.test.js
@@ -0,0 +1,32 @@
+const root = '../../';
+
+require(root + 'jspsych.js');
+
+describe('unique', function(){
+  test('generates unique array when there are duplicates', function(){
+    var arr = [1,1,2,2,3,3];
+    var out = jsPsych.utils.unique(arr);
+    expect(out).toEqual([1,2,3]);
+    expect(out).not.toEqual(arr);
+  });
+
+  test('generates same array when there are no duplicates', function(){
+    var arr = [1,2,3];
+    var out = jsPsych.utils.unique(arr);
+    expect(out).toEqual(arr);
+  })
+});
+
+describe('flatten', function(){
+  test('generates flat array from flat input', function(){
+    var arr = [1,1,2,2,3,3];
+    var out = jsPsych.utils.flatten(arr);
+    expect(out).toEqual(arr);
+  });
+
+  test('generates flat array from nested input', function(){
+    var arr = [1,[1,2,2],[3],3];
+    var out = jsPsych.utils.flatten(arr);
+    expect(out).toEqual([1,1,2,2,3,3]);
+  });
+});