import pytest
from ea_chatbot.utils.vfs import VFSHelper

def test_vfs_read_write():
    """Verify that we can write and read from the VFS."""
    vfs = {}
    helper = VFSHelper(vfs)
    
    helper.write("test.txt", "Hello World", metadata={"type": "text"})
    assert "test.txt" in vfs
    assert vfs["test.txt"]["content"] == "Hello World"
    assert vfs["test.txt"]["metadata"]["type"] == "text"
    
    content, metadata = helper.read("test.txt")
    assert content == "Hello World"
    assert metadata["type"] == "text"

def test_vfs_list():
    """Verify that we can list files in the VFS."""
    vfs = {}
    helper = VFSHelper(vfs)
    
    helper.write("a.txt", "content a")
    helper.write("b.txt", "content b")
    
    files = helper.list()
    assert "a.txt" in files
    assert "b.txt" in files
    assert len(files) == 2

def test_vfs_delete():
    """Verify that we can delete files from the VFS."""
    vfs = {}
    helper = VFSHelper(vfs)
    
    helper.write("test.txt", "Hello")
    helper.delete("test.txt")
    
    assert "test.txt" not in vfs
    assert len(helper.list()) == 0

def test_vfs_not_found():
    """Verify that reading a non-existent file returns None."""
    vfs = {}
    helper = VFSHelper(vfs)
    
    content, metadata = helper.read("missing.txt")
    assert content is None
    assert metadata is None