file-manager: Add new module with basic API for filesystem

Author: microbit-carlos

src/__tests__/file-manager.spec.ts

@@ -0,0 +1,64 @@
+import * as fs from 'fs';
+
+import { FileSystem } from '../file-manager';
+
+describe('Test', () => {
+  const uPyHexFile = fs.readFileSync('./src/__tests__/upy-v1.0.1.hex', 'utf8');
+
+  it('Write and Read files', () => {
+    const content1 = "from microbit import display\r\ndisplay.show('x')";
+    const content2 = "from microbit import display\r\ndisplay.show('y')";
+
+    const microbitFs = new FileSystem(uPyHexFile);
+    microbitFs.write('test.py', content1);
+    microbitFs.write('test2.py', content2);
+    const file1 = microbitFs.read('test.py');
+    const file2 = microbitFs.read('test2.py');
+
+    const files = microbitFs.ls();
+    expect(files).toContain('test.py');
+    expect(files).toContain('test2.py');
+    expect(file1).toEqual(content1);
+    expect(file2).toEqual(content2);
+  });
+
+  it('Write and Read files bytes', () => {
+    const content1 = new Uint8Array([1, 2, 3]);
+    const content2 = new Uint8Array([4, 5, 6]);
+
+    const microbitFs = new FileSystem(uPyHexFile);
+    microbitFs.write('test.py', content1);
+    microbitFs.write('test2.py', content2);
+    const file1 = microbitFs.readBytes('test.py');
+    const file2 = microbitFs.readBytes('test2.py');
+
+    const files = microbitFs.ls();
+    expect(files).toContain('test.py');
+    expect(files).toContain('test2.py');
+    expect(file1).toEqual(content1);
+    expect(file2).toEqual(content2);
+  });
+
+  it('Delete files', () => {
+    const content = "from microbit import display\r\ndisplay.show('x')";
+
+    const microbitFs = new FileSystem(uPyHexFile);
+    microbitFs.write('test.py', content);
+    microbitFs.write('test2.py', content);
+    const lsBefore = microbitFs.ls();
+    microbitFs.remove('test.py');
+    const lsAfter = microbitFs.ls();
+
+    expect(lsBefore).toContain('test.py');
+    expect(lsAfter).not.toContain('test.py');
+  });
+
+  it('Get Intel Hex', () => {
+    // This test is a bit useless at the moment, need to replace as soon
+    // as this method is properly implemented
+    const microbitFs = new FileSystem(uPyHexFile);
+    const returnedIntelHex = microbitFs.getIntelHex();
+
+    expect(returnedIntelHex).toEqual(uPyHexFile);
+  });
+});