fix Darwin canonical test fixtures

backend/test/routes-workspaces.test.ts

@@ -2,7 +2,7 @@ import { execFile } from "node:child_process";
 import { createHash } from "node:crypto";
 import { once } from "node:events";
 import { Buffer } from "node:buffer";
-import { mkdtempSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { mkdtempSync, mkdirSync, readFileSync, realpathSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { promisify } from "node:util";
@@ -486,7 +486,7 @@ async function realGit(cwd: string, args: string[]): Promise<string> {
 async function createRealRouteFixture(
   initialWorkspace: CanonicalWorkspace = filesystemEvidenceWorkspace,
 ): Promise<RealRouteFixture> {
-  const root = mkdtempSync(join(tmpdir(), "thoth-real-workspace-route-"));
+  const root = realpathSync(mkdtempSync(join(tmpdir(), "thoth-real-workspace-route-")));
   realRouteRoots.push(root);
   const remote = join(root, "remote.git");
   const author = join(root, "author");