Struct InMemoryFileSystem

pub struct InMemoryFileSystem { /* private fields */ }

In-memory filesystem for use in unit tests.

This type mocks out the file system operations in the VM. It provides an in-memory system to which “files” can be added before the test runs. It is designed to help test primitives that interact with the filesystem.

Given a VM, the file system can be set as follows:

let mut vm = vm::VM::<State>::new(
    Default::default(),  // initial commands
);
let mock_file_system: InMemoryFileSystem = Default::default();
vm.file_system = Box::new(mock_file_system);

When using the test runners in this module or the test_suite macro, assign the file system ops using the TestOption::CustomVMInitializationDyn option:

let options = TestOption::CustomVMInitializationDyn(Box::new(|vm: &mut vm::VM<State>|{
    let mock_file_system: InMemoryFileSystem = Default::default();
    vm.file_system = Box::new(mock_file_system);
}));

Implementations

impl InMemoryFileSystem

pub fn add_file(&mut self, path: PathBuf, content: &str)

Add a file to the in-memory file system.

Trait Implementations

impl Default for InMemoryFileSystem

fn default() -> InMemoryFileSystem

Returns the “default value” for a type.

impl FileSystem for InMemoryFileSystem

fn read_to_string(&self, path: &Path) -> Result<String>

Read the entire contents of a file into a string.

fn write_bytes(&self, _: &Path, _: &[u8]) -> Result<()>

Write a slice of bytes to a file.