From 2b681bfa7f86ecb03e175f1002cabd87e9500d13 Mon Sep 17 00:00:00 2001
From: Matei Adriel <rafaeladriel11@gmail.com>
Date: Mon, 23 Dec 2019 16:11:20 +0200
Subject: [PATCH] typescript(option): test: added tests for exists
Signed-off-by: prescientmoon <git@moonythm.dev>
---
typescript/option/src/helpers/exists.test.ts | 33 ++++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 typescript/option/src/helpers/exists.test.ts
diff --git a/typescript/option/src/helpers/exists.test.ts b/typescript/option/src/helpers/exists.test.ts
new file mode 100644
index 0000000..32f8494
--- /dev/null
+++ b/typescript/option/src/helpers/exists.test.ts
@@ -0,0 +1,33 @@
+import { expect } from 'chai'
+import { exists } from './exists'
+import { constantly } from '@thi.ng/compose'
+import { None, Some } from '../types'
+import { x } from '../../test/constants'
+
+describe('The exists helper', () => {
+ it('should return false when given None', () => {
+ // act
+ const result = exists(constantly(true), None)
+
+ // assert
+ expect(result).to.equal(false)
+ })
+
+ describe('When given Some', () => {
+ it('should return true if the callback returns true', () => {
+ // act
+ const result = exists(constantly(true), Some(x))
+
+ // assert
+ expect(result).to.equal(true)
+ })
+
+ it('should return false if the callback returns false', () => {
+ // act
+ const result = exists(constantly(false), Some(x))
+
+ // assert
+ expect(result).to.equal(false)
+ })
+ })
+})