feat: add custom errors

test/unit/util/errors/UnsupportedHttpError.test.ts

@@ -0,0 +1,17 @@
+import { UnsupportedHttpError } from '../../../../src/util/errors/UnsupportedHttpError';
+
+describe('An UnsupportedHttpError', (): void => {
+  it('has status code 400.', async (): Promise<void> => {
+    const error = new UnsupportedHttpError('test');
+
+    expect(error.statusCode).toEqual(400);
+    expect(error.message).toEqual('test');
+    expect(error.name).toEqual('UnsupportedHttpError');
+  });
+
+  it('has a default message if none was provided.', async (): Promise<void> => {
+    const error = new UnsupportedHttpError();
+
+    expect(error.message).toEqual('The given input is not supported by the server configuration.');
+  });
+});