diff --git a/__test__/Line/line.test.ts b/__test__/Line/line.test.ts
index ecef8142d..d6041f4c0 100644
--- a/__test__/Line/line.test.ts
+++ b/__test__/Line/line.test.ts
@@ -189,7 +189,7 @@ test('直线合并', () =>
     //L2                     ----         
     l2.StartPoint = new Vector3(15);
     l2.EndPoint = new Vector3(12);
-    expect(l1.Join(l2)).toBeFalsy();
+    expect(l1.Join(l2)).toBeTruthy();
 
     //L1        -----------         
     //L2   ---------------------         
@@ -199,6 +199,14 @@ test('直线合并', () =>
 
 });
 
+test('直线合并容差', () =>
+{
+    let l1 = new Line(new Vector3(0), new Vector3(10));
+    let l2 = new Line(new Vector3(10 + 1e-6), new Vector3(15));
+    expect(l1.Join(l2)).toBeTruthy();
+    l2 = new Line(new Vector3(-10), new Vector3(0 - 1e-5));
+    expect(l1.Join(l2)).toBeTruthy();
+});
 
 test('直线合并不平行', () =>
 {