From 0e6427f2bc69aae2000ba924df9fdbd8837281e4 Mon Sep 17 00:00:00 2001
From: Zheeeng <hi@zheeeng.me>
Date: Tue, 4 Aug 2020 21:11:39 +0800
Subject: [PATCH] fix: testcase (#41)

---
 questions/18-easy-tuple-length/README.md     | 8 ++++----
 questions/18-easy-tuple-length/test-cases.ts | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/questions/18-easy-tuple-length/README.md b/questions/18-easy-tuple-length/README.md
index 9c632b95..96b3451f 100644
--- a/questions/18-easy-tuple-length/README.md
+++ b/questions/18-easy-tuple-length/README.md
@@ -5,11 +5,11 @@ For given a tuple, you need create a generic `Length`, pick the length of the tu
 For example
 
 ```ts
-type tesla = ['tesla', 'model 3', 'model X', 'model Y']
-type spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT']
+type tesla = ['tesla', 'model 3', 'model X', 'model Y'] as const
+type spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT'] as const
 
-type teslaLength = Length<tesla>  // expected 4
-type spaceXLength = Length<spaceX> // expected 5
+type teslaLength = Length<typeof tesla>  // expected 4
+type spaceXLength = Length<typeof spaceX> // expected 5
 ```
 
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diff --git a/questions/18-easy-tuple-length/test-cases.ts b/questions/18-easy-tuple-length/test-cases.ts
index c84684e3..4ef158b1 100644
--- a/questions/18-easy-tuple-length/test-cases.ts
+++ b/questions/18-easy-tuple-length/test-cases.ts
@@ -1,9 +1,9 @@
 import { Equal, Expect } from '@type-challenges/utils'
 
-const tesla = ['tesla', 'model 3', 'model X', 'model Y']
-const spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT']
+const tesla = ['tesla', 'model 3', 'model X', 'model Y'] as const
+const spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT'] as const
 
 type cases = [
-  Expect<Equal<Length<tesla>, 4>>,
-  Expect<Equal<Length<spaceX>, 5>>,
+  Expect<Equal<Length<typeof tesla>, 4>>,
+  Expect<Equal<Length<typeof spaceX>, 5>>,
 ]