Add test for file not found

test/fromFile.test.js

@@ -1,40 +1,57 @@
-const { strictEqual, throws } = require('assert')
+const { strictEqual } = require('assert')
+const assert = require('assert/strict')
 const { resolve } = require('path')
+const { promisify } = require('util')
 const { isReadable } = require('isstream')
 const { describe, it } = require('mocha')
 const rdf = require('rdf-ext')
+const { finished } = require('readable-stream')
 const fromFile = require('../fromFile')
 const example = require('./support/example')
 
 describe('fromFile', () => {
   it('should create a quad stream', async () => {
     const stream = fromFile(resolve(__dirname, 'support/example.nt'))
-
     stream.resume()
-
     strictEqual(isReadable(stream), true)
   })
 
   it('should forward options to parser', async () => {
     const stream = fromFile(resolve(__dirname, 'support/example.ttl'), { baseIRI: 'http://example.org/' })
     const dataset = await rdf.dataset().import(stream)
-
     strictEqual(dataset.toCanonical(), example().toCanonical())
   })
 
   it('should throw an error if the file extension is unknown', () => {
-    throws(() => {
+    assert.throws(() => {
       fromFile('test.jpg')
+    }, {
+      name: 'Error',
+      message: 'Unknown file extension: jpg'
     })
   })
 
   it('should throw an error if the media type is unknown', () => {
-    throws(() => {
+    assert.throws(() => {
       fromFile('test.jpg', {
         extensions: {
           jpg: 'image/jpeg'
         }
       })
+    }, {
+      name: 'Error',
+      message: 'No parser available for media type: image/jpeg'
+    })
+  })
+
+  it('should throw an error if the file does not exist', async () => {
+    await assert.rejects(async () => {
+      const stream = fromFile('void.ttl')
+      stream.resume()
+      await promisify(finished)(stream)
+    }, {
+      name: 'Error',
+      message: "ENOENT: no such file or directory, open 'void.ttl'"
     })
   })
 })