add basic tests

src/shims/fs/metadata-cache.test.js

@@ -0,0 +1,60 @@
+import { describe, it, expect } from "vitest";
+import { MetadataCache } from "./metadata-cache.js";
+
+// -- Path normalization ----------------------------------------------
+
+describe("MetadataCache path normalization", () => {
+  it("converts backslashes to forward slashes", () => {
+    const cache = new MetadataCache();
+    cache.set("foo\\bar\\baz.md", { type: "file", size: 10 });
+    expect(cache.has("foo/bar/baz.md")).toBe(true);
+  });
+
+  it("strips leading and trailing slashes", () => {
+    const cache = new MetadataCache();
+    cache.set("/foo/bar/", { type: "file", size: 10 });
+    expect(cache.has("foo/bar")).toBe(true);
+  });
+
+  it("handles null and undefined as empty string", () => {
+    const cache = new MetadataCache();
+    cache.set(null, { type: "directory", size: 0 });
+    expect(cache.has("")).toBe(true);
+    expect(cache.has(undefined)).toBe(true);
+  });
+
+  it("normalizes //foo\\\\bar// to foo/bar", () => {
+    const cache = new MetadataCache();
+    cache.set("//foo\\bar//", { type: "file", size: 5 });
+    expect(cache.has("foo/bar")).toBe(true);
+  });
+});
+
+// -- Operations ------------------------------------------------------
+
+describe("MetadataCache populate and merge", () => {
+  it.todo("populate() clears existing entries");
+  it.todo("merge() preserves existing entries");
+  it.todo("populate then merge -- pre-existing entries survive merge");
+});
+
+describe("MetadataCache toStat", () => {
+  it.todo("returns correct shape with all expected fields and methods");
+  it.todo("returns null for missing paths");
+  it.todo("constructs dates from zero when mtime/ctime are missing");
+});
+
+describe("MetadataCache readdir", () => {
+  it.todo("root readdir returns top-level entries");
+  it.todo("nested dir returns only direct children, not grandchildren");
+  it.todo(
+    "readdir of foo does not include foobar entries (prefix false-match)",
+  );
+  it.todo("infers directory type for paths with no direct map entry");
+  it.todo("returns empty array for path with no children");
+  it.todo("returns empty array for nonexistent path");
+});
+
+describe("MetadataCache rename", () => {
+  it.todo("rename file: old path gone, new path present with same metadata");
+});