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diff --git a/auto_tests/tests/custom_asserts.js b/auto_tests/tests/custom_asserts.js
new file mode 100644
index 0000000..06e2444
--- /dev/null
+++ b/auto_tests/tests/custom_asserts.js
@@ -0,0 +1,11 @@
+/**
+ * @fileoverview Assertions that chai doesn't provide out of the box.
+ */
+
+var assertDeepCloseTo = function(actualArray, expectedArray, epsilon) {
+  assert.isArray(actualArray);
+  assert.isArray(expectedArray);
+  for (var i = 0; i < actualArray.length; i++) {
+    assert.closeTo(actualArray[i], expectedArray[i], epsilon);
+  }
+};