stricter checks

tests/herdr.test.ts

@@ -45,9 +45,9 @@ async function fixture() {
     let childWorkspaceIDOverride: string | undefined;
     let childPathOverride: string | undefined;
     let repoOverride: string | undefined;
-    const run = async (args: string[], cwd: string, signal: AbortSignal) => {
+    const run = async (args: string[], cwd: string, abort: AbortSignal) => {
         calls.push(args);
-        if (args[0] !== "herdr") return command(args, cwd, signal);
+        if (args[0] !== "herdr") return command(args, cwd, abort);
         if (args[1] === "workspace")
             return JSON.stringify({
                 result: {
@@ -57,7 +57,7 @@ async function fixture() {
                 },
             });
         if (args[2] === "list") {
-            const id = args[4]!;
+            const id = args[4] ?? "";
             const path = id === "w2" ? destination : root;
             const sourceWorkspaceID = sourceWorkspaceIDOverride ?? (id === "w2" ? "w1" : id);
             const sourcePath = sourcePathOverride ?? root;
@@ -93,10 +93,10 @@ async function fixture() {
         expect(args[2]).toBe("create");
         expect(args.slice(3, 5)).toEqual(["--cwd", root]);
         expect(args.at(-1)).toBe("--no-focus");
-        branch = args[args.indexOf("--branch") + 1]!;
+        branch = args[args.indexOf("--branch") + 1] ?? "";
         const labelIndex = args.indexOf("--label");
         label = labelIndex === -1 ? undefined : args[labelIndex + 1];
-        const base = args[args.indexOf("--base") + 1]!;
+        const base = args[args.indexOf("--base") + 1] ?? "";
         // Real Git worktree behavior, but only in an isolated temporary repository.
         await command(["git", "worktree", "add", "-b", branch, destination, base], root, signal);
         return JSON.stringify({
@@ -144,14 +144,15 @@ test("create verifies a linked workspace whose inventory source remains the pare
     const f = await fixture();
     const root = await f.herdr.root(f.root, f.signal);
     expect(root?.workspaceID).toBe("w1");
-    const destination = await f.herdr.create(root!, "other", "multi-work/fixture", f.signal);
+    if (!root) throw new Error("Missing Herdr root");
+    const destination = await f.herdr.create(root, "other", "multi-work/fixture", f.signal);
     expect(destination.directory).toBe(f.destination);
     expect(destination.branch).toStartWith("multi-work/");
     expect(await command(["git", "branch", "--show-current"], f.root, f.signal)).toBe("main");
     await f.herdr.verify(
         destination.directory,
         destination.workspaceID,
-        root!,
+        root,
         destination.branch,
         f.signal,
     );