diff --git a/tests/ama/ama.spec.ts b/tests/ama/ama.spec.ts
index b63568e..7325c99 100644
--- a/tests/ama/ama.spec.ts
+++ b/tests/ama/ama.spec.ts
@@ -3,14 +3,14 @@ import { data } from './data';
 
 describe('Adaptive Moving Average', () => {
     const ama = new AMA(15, 2, 30);
-    const EPSILON = 0.01;
+    const EPSILON = 0.001;
 
     it('Excel validate', () => {
         data.forEach((tick, idx) => {
             const amaValue = ama.nextValue(tick.c);
             const expected = Number(tick.ama);
 
-            if (amaValue) {
+            if (amaValue && expected) {
                 expect(Math.abs(amaValue - expected)).toBeLessThan(EPSILON);
             }