feature: SERVERUS_ROOT environment variable

tests/01_get_static_file.test.ts

@@ -25,6 +25,7 @@ Deno.test({
 
 			asserts.assert(response.ok);
 			asserts.assert(body);
+			asserts.assertEquals(body, 'this is a test\n');
 		} finally {
 			Deno.chdir(cwd);
 			if (test_server_info) {

tests/06_test_overriding_root.test.ts

@@ -0,0 +1,35 @@
+import * as asserts from '@std/assert';
+import { EPHEMERAL_SERVER, get_ephemeral_listen_server } from './helpers.ts';
+
+Deno.test({
+	name: 'override the default root',
+	permissions: {
+		env: true,
+		read: true,
+		write: true,
+		net: true
+	},
+	fn: async () => {
+		let test_server_info: EPHEMERAL_SERVER | null = null;
+
+		try {
+			Deno.env.set('SERVERUS_ROOT', './tests/www');
+			test_server_info = await get_ephemeral_listen_server();
+
+			const response = await fetch(`http://${test_server_info.hostname}:${test_server_info.port}/test.txt`, {
+				method: 'GET'
+			});
+
+			const body = await response.text();
+
+			asserts.assert(response.ok);
+			asserts.assert(body);
+			asserts.assertEquals(body, 'this is a test\n');
+		} finally {
+			Deno.env.delete('SERVERUS_ROOT');
+			if (test_server_info) {
+				await test_server_info?.server?.stop();
+			}
+		}
+	}
+});