feat: file system access, behind a path policy and an approval (#25)

src/__tests__/preferences.test.ts

@@ -296,3 +296,37 @@ describe("the model selection", () => {
     });
   });
 });
+
+describe("file access preferences", () => {
+  it("is off when nothing says otherwise", () => {
+    // The default matters more than the setting here: an assistant that can read files
+    // should be one the user switched on, because reading is the half that cannot ask
+    // first.
+    expect(resolvePreferences({}).fileEnabled).toBe(false);
+  });
+
+  it("is on only when the checkbox is ticked", () => {
+    expect(resolvePreferences({ fileAccess: true }).fileEnabled).toBe(true);
+    expect(resolvePreferences({ fileAccess: false }).fileEnabled).toBe(false);
+  });
+
+  it("carries extra roots, and reports the ones it could not use", () => {
+    const resolved = resolvePreferences({
+      readRoots: "/Volumes/Archive\nrelative/oops",
+      writeRoots: "/Volumes/Archive/scratch",
+    });
+
+    expect(resolved.extraReadRoots).toEqual(["/Volumes/Archive"]);
+    expect(resolved.rejectedReadRoots).toEqual(["relative/oops"]);
+    expect(resolved.extraWriteRoots).toEqual(["/Volumes/Archive/scratch"]);
+    expect(resolved.rejectedWriteRoots).toEqual([]);
+  });
+
+  it("has no extra roots when the fields are empty", () => {
+    const resolved = resolvePreferences({});
+    expect(resolved.extraReadRoots).toEqual([]);
+    expect(resolved.extraWriteRoots).toEqual([]);
+    expect(resolved.rejectedReadRoots).toEqual([]);
+    expect(resolved.rejectedWriteRoots).toEqual([]);
+  });
+});