Add test for file not found

test/fromFile.test.js

@@ -1,4 +1,5 @@
-const { strictEqual, throws } = require('assert')
+const { strictEqual } = require('assert')
+const assert = require('assert/strict')
 const { resolve } = require('path')
 const { isReadable } = require('isstream')
 const { describe, it } = require('mocha')
@@ -9,32 +10,54 @@ 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(() => {
-      fromFile('test.jpg')
-    })
+  it('should throw an error if the file extension is unknown', async () => {
+    await assert.rejects(
+      async () => {
+        fromFile('test.jpg')
+      },
+      {
+        name: 'Error',
+        message: 'Unknown file extension: jpg'
+      }
+    )
+  })
+
+  it('should throw an error if the media type is unknown', async () => {
+    await assert.rejects(
+      async () => {
+        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 media type is unknown', () => {
-    throws(() => {
-      fromFile('test.jpg', {
-        extensions: {
-          jpg: '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()
+      },
+      {
+        name: 'Error',
+        message: 'ENOENT: no such file or directory'
+      }
+    )
   })
-})
+})