test: add unit test for normalizeConfig "root"

Author: csvn

src/config_test.ts

@@ -1,5 +1,5 @@
 import { expect } from "@std/expect";
-import { parseRootPath } from "./config.ts";
+import { normalizeConfig, parseRootPath } from "./config.ts";
 
 Deno.test("parseRootPath", () => {
   const cwd = Deno.cwd().replaceAll("\\", "/");
@@ -22,3 +22,16 @@ Deno.test("parseRootPath", () => {
   expect(parseRootPath("/foo/bar.jsx", cwd)).toEqual("/foo");
   expect(parseRootPath("/foo/bar.mjs", cwd)).toEqual("/foo");
 });
+
+Deno.test("normalizeConfig - root", () => {
+  const cwd = Deno.cwd().replaceAll("\\", "/");
+  const configRoot = (root?: string) => normalizeConfig({ root }).root;
+
+  expect(configRoot()).toEqual(cwd);
+  expect(configRoot("/foo/bar")).toEqual("/foo/bar");
+  expect(configRoot("/foo/bar.ts")).toEqual("/foo");
+  expect(configRoot("file:///foo/bar")).toEqual("/foo/bar");
+  expect(configRoot("file:///C:/foo/bar")).toEqual("C:/foo/bar");
+  expect(configRoot("./foo/bar")).toEqual(`${cwd}/foo/bar`);
+  expect(configRoot("./foo/bar.ts")).toEqual(`${cwd}/foo`);
+});