From 5db8376f95285357aa2808aa64d0f04f6c133621 Mon Sep 17 00:00:00 2001
From: lana-k <skochetova89@gmail.com>
Date: Mon, 12 Apr 2021 18:23:48 +0200
Subject: [PATCH] add tests for readAsArrayBuffer method #27

---
 src/fileUtils.js             |  3 ++-
 tests/unit/fileUtils.spec.js | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/fileUtils.js b/src/fileUtils.js
index 8068d0e..6907a4c 100644
--- a/src/fileUtils.js
+++ b/src/fileUtils.js
@@ -36,10 +36,11 @@ export default {
   },
 
   importFile () {
+    const reader = new FileReader()
+
     return this.getFileFromUser('.json')
       .then(file => {
         return new Promise((resolve, reject) => {
-          const reader = new FileReader()
           reader.onload = e => {
             resolve(e.target.result)
           }
diff --git a/tests/unit/fileUtils.spec.js b/tests/unit/fileUtils.spec.js
index 06c4f28..617ce60 100644
--- a/tests/unit/fileUtils.spec.js
+++ b/tests/unit/fileUtils.spec.js
@@ -87,4 +87,24 @@ describe('fileUtils.js', () => {
     fu.readFile('./foo.bar')
     expect(window.fetch.calledOnceWith('./foo.bar')).to.equal(true)
   })
+
+  it('readAsArrayBuffer resolves', async () => {
+    const blob = new Blob(['foo'])
+    const buffer = await fu.readAsArrayBuffer(blob)
+
+    const uint8Array = new Uint8Array(buffer)
+    const text = new TextDecoder().decode(uint8Array)    
+    expect(text).to.equal('foo')
+  })
+
+  it('readAsArrayBuffer rejects', async () => {
+    const r = new FileReader()
+    r.readAsArrayBuffer = () => {
+      r.dispatchEvent(new Event('error'), )
+    }
+    sinon.stub(window, 'FileReader').returns(r)
+  
+    const blob = new Blob(['foo'])
+    await expect(fu.readAsArrayBuffer(blob)).to.be.rejectedWith('Problem parsing input file.')
+  })
 })