expand shim coverage, additional fs shims, add light stream shim

packages/shim/src/fs/sync-mutations.test.js

@@ -0,0 +1,128 @@
+import { describe, it, expect, vi } from "vitest";
+import { createFsSync } from "./sync.js";
+import { resolvePath } from "./transforms.js";
+
+function makeDeps() {
+  const store = new Map();
+
+  const metadataCache = {
+    has: (p) => store.has(p),
+    get: (p) => (store.has(p) ? store.get(p) : null),
+    set: (p, m) => store.set(p, m),
+    delete: (p) => store.delete(p),
+    rename: (a, b) => {
+      if (store.has(a)) {
+        store.set(b, store.get(a));
+        store.delete(a);
+      }
+    },
+    toStat: (p) =>
+      store.has(p)
+        ? {
+            type: store.get(p).type,
+            isDirectory: () => store.get(p).type === "directory",
+            isFile: () => store.get(p).type === "file",
+          }
+        : null,
+    readdir: () => [],
+  };
+
+  const contentCache = {
+    get: () => null,
+    set: vi.fn(),
+    delete: vi.fn(),
+    invalidate: vi.fn(),
+  };
+
+  const transport = {
+    mkdir: vi.fn(async () => {}),
+    rmdir: vi.fn(async () => {}),
+    rm: vi.fn(async () => {}),
+    rename: vi.fn(async () => {}),
+    copyFile: vi.fn(async () => {}),
+    appendFile: vi.fn(async () => {}),
+    utimes: vi.fn(async () => {}),
+    stat: vi.fn(async () => ({ type: "file", size: 1 })),
+  };
+
+  return { metadataCache, contentCache, transport, store };
+}
+
+describe("sync fs mutations", () => {
+  it("lstatSync mirrors statSync", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+    deps.store.set(resolvePath("dir"), { type: "directory" });
+
+    expect(fs.lstatSync("dir").isDirectory()).toBe(true);
+  });
+
+  it("mkdirSync updates the cache and fires the transport", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+
+    fs.mkdirSync("newdir", { recursive: true });
+
+    expect(deps.store.get("newdir")).toEqual({ type: "directory" });
+    expect(deps.transport.mkdir).toHaveBeenCalledWith("newdir", true);
+  });
+
+  it("rmSync deletes from the cache and fires the transport", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+    const key = resolvePath("gone.md");
+    deps.store.set(key, { type: "file" });
+
+    fs.rmSync("gone.md", { recursive: true });
+
+    expect(deps.store.has(key)).toBe(false);
+    expect(deps.transport.rm).toHaveBeenCalled();
+  });
+
+  it("renameSync moves cache metadata and fires the transport", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+    const from = resolvePath("a.md");
+    const to = resolvePath("b.md");
+    deps.store.set(from, { type: "file", size: 2 });
+
+    fs.renameSync("a.md", "b.md");
+
+    expect(deps.store.has(from)).toBe(false);
+    expect(deps.store.get(to)).toEqual({ type: "file", size: 2 });
+    expect(deps.transport.rename).toHaveBeenCalled();
+  });
+
+  it("copyFileSync optimistically mirrors source metadata and fires the transport", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+    const srcKey = resolvePath("src.md");
+    const destKey = resolvePath("dest.md");
+    deps.store.set(srcKey, { type: "file", size: 9 });
+
+    fs.copyFileSync("src.md", "dest.md");
+
+    expect(deps.store.get(destKey)).toEqual({ type: "file", size: 9 });
+    expect(deps.transport.copyFile).toHaveBeenCalled();
+  });
+
+  it("utimesSync sets mtime and fires the transport", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+    const key = resolvePath("note.md");
+    deps.store.set(key, { type: "file", mtime: 0 });
+
+    fs.utimesSync("note.md", 111, 222);
+
+    expect(deps.store.get(key).mtime).toBe(222);
+    expect(deps.transport.utimes).toHaveBeenCalled();
+  });
+
+  it("chmodSync is a no-op that does not throw", () => {
+    const deps = makeDeps();
+    const fs = createFsSync(deps.metadataCache, deps.contentCache, deps.transport);
+
+    expect(() => fs.chmodSync("note.md", 0o644)).not.toThrow();
+    expect(fs.chmodSync("note.md", 0o644)).toBeUndefined();
+  });
+});