feat: finish implementing getRecordById method

tests/Attachment.spec.ts

@@ -1,6 +1,55 @@
 import { Attachment } from '../src/models/Attachment';
 import { expect } from 'chai';
+import { FileStorageSite } from '../src/enums/FileStorageSite';
 
 describe('Attachment', function () {
-  throw new Error('Not implemented');
+  it('should be defined', function () {
+    expect(Attachment).to.not.be.undefined;
+  });
+
+  it('should have a constructor', function () {
+    expect(Attachment).to.have.property('constructor');
+  });
+
+  it('should have a constructor that takes 4 parameters', function () {
+    expect(Attachment).to.have.lengthOf(4);
+  });
+
+  it('should have a fileId property', function () {
+    expect(
+      new Attachment(1, 'test', 'test', FileStorageSite.Internal)
+    ).to.have.property('fileId');
+  });
+
+  it('should have a fileName property', function () {
+    expect(
+      new Attachment(1, 'test', 'test', FileStorageSite.Internal)
+    ).to.have.property('fileName');
+  });
+
+  it('should have a notes property', function () {
+    expect(
+      new Attachment(1, 'test', 'test', FileStorageSite.Internal)
+    ).to.have.property('notes');
+  });
+
+  it('should have a storageLocation property', function () {
+    expect(
+      new Attachment(1, 'test', 'test', FileStorageSite.Internal)
+    ).to.have.property('storageLocation');
+  });
+
+  it('should have a constructor that sets its properties correctly', function () {
+    const fileId = 1;
+    const fileName = 'test';
+    const notes = 'test';
+    const storageLocation = FileStorageSite.Internal;
+
+    const attachment = new Attachment(fileId, fileName, notes, storageLocation);
+
+    expect(attachment).to.have.property('fileId', fileId);
+    expect(attachment).to.have.property('fileName', fileName);
+    expect(attachment).to.have.property('notes', notes);
+    expect(attachment).to.have.property('storageLocation', storageLocation);
+  });
 });