docker run -it sot528/truffle-vyper-test

$ truffle test

Using network 'test'.



  Contract: VyperStorage
    ✓ ...should store the value 89. (114ms)


  1 passing (129ms)

stored_data: uint256

@public
def set(new_value : uint256):
    self.stored_data = new_value

@public
@constant
def get() -> uint256:
    return self.stored_data

const VyperStorage = artifacts.require("VyperStorage");

contract("VyperStorage", () => {
  it("...should store the value 89.", async () => {
    const storage = await VyperStorage.deployed();

    // Set value of 89
    await storage.set(89);

    // Get stored value
    const storedData = await storage.get();

    assert.equal(storedData, 89, "The value 89 was not stored.");
  });
});

Error parsing /code/contracts/VyperStorage.vy: ParsedContract.sol:1:1: ParserError: Expected pragma, import directive or contract/interface/library definition.
stored_data: uint256
^---------^
Compilation failed. See above.
Truffle v5.0.0 (core: 5.0.0)