Created a File Class (#97)

* Created a File Class
* Test the untested parts
* ignore any d.ts file

test.js

@@ -1,10 +1,11 @@
 import fs from 'fs';
-import test from 'ava';
-import {Response} from 'node-fetch';
 import {Readable} from 'stream';
 import buffer from 'buffer';
+import test from 'ava';
+import {Response} from 'node-fetch';
+import syncBlob, {blobFromSync, blobFrom, fileFromSync, fileFrom} from './from.js';
+import File from './file.js';
 import Blob from './index.js';
-import syncBlob, {blobFromSync, blobFrom} from './from.js';
 
 const license = fs.readFileSync('./LICENSE', 'utf-8');
 
@@ -164,7 +165,22 @@ test('Reading after modified should fail', async t => {
 	const now = new Date();
 	// Change modified time
 	fs.utimesSync('./LICENSE', now, now);
-	const error = await blob.text().catch(error => error);
+	const error = await t.throwsAsync(blob.text());
+	t.is(error.constructor.name, 'DOMException');
+	t.is(error instanceof Error, true);
+	t.is(error.name, 'NotReadableError');
+});
+
+test('Reading file after modified should fail', async t => {
+	const file = fileFromSync('./LICENSE');
+	await new Promise(resolve => {
+		setTimeout(resolve, 100);
+	});
+	const now = new Date();
+	// Change modified time
+	fs.utimesSync('./LICENSE', now, now);
+	const error = await t.throwsAsync(file.text());
+	t.is(error.constructor.name, 'DOMException');
 	t.is(error instanceof Error, true);
 	t.is(error.name, 'NotReadableError');
 });
@@ -239,6 +255,7 @@ test('Large chunks are divided into smaller chunks', async t => {
 });
 
 test('Can use named import - as well as default', async t => {
+	// eslint-disable-next-line node/no-unsupported-features/es-syntax
 	const {Blob, default: def} = await import('./index.js');
 	t.is(Blob, def);
 });
@@ -254,3 +271,54 @@ if (buffer.Blob) {
 		t.is(await blob2.text(), 'blob part');
 	});
 }
+
+test('File is a instance of blob', t => {
+	t.true(new File([], '') instanceof Blob);
+});
+
+test('fileFrom returns the name', async t => {
+	t.is((await fileFrom('./LICENSE')).name, 'LICENSE');
+});
+
+test('fileFromSync returns the name', t => {
+	t.is(fileFromSync('./LICENSE').name, 'LICENSE');
+});
+
+test('fileFromSync(path, type) sets the type', t => {
+	t.is(fileFromSync('./LICENSE', 'text/plain').type, 'text/plain');
+});
+
+test('blobFromSync(path, type) sets the type', t => {
+	t.is(blobFromSync('./LICENSE', 'text/plain').type, 'text/plain');
+});
+
+test('fileFrom(path, type) sets the type', async t => {
+	const file = await fileFrom('./LICENSE', 'text/plain');
+	t.is(file.type, 'text/plain');
+});
+
+test('fileFrom(path, type) read/sets the lastModified ', async t => {
+	const file = await fileFrom('./LICENSE', 'text/plain');
+	// Earlier test updates the last modified date to now
+	t.is(typeof file.lastModified, 'number');
+	// The lastModifiedDate is deprecated and removed from spec
+	t.false('lastModifiedDate' in file);
+	t.is(file.lastModified > Date.now() - 60000, true);
+});
+
+test('blobFrom(path, type) sets the type', async t => {
+	const blob = await blobFrom('./LICENSE', 'text/plain');
+	t.is(blob.type, 'text/plain');
+});
+
+test('blobFrom(path) sets empty type', async t => {
+	const blob = await blobFrom('./LICENSE');
+	t.is(blob.type, '');
+});
+
+test('new File() throws with too few args', t => {
+	t.throws(() => new File(), {
+		instanceOf: TypeError,
+		message: 'Failed to construct \'File\': 2 arguments required, but only 0 present.'
+	});
+});