File size: 1,957 Bytes
6851d40 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | /*******************************************************************************
* Copyright by the contributors to the Dafny Project
* SPDX-License-Identifier: MIT
*******************************************************************************/
// RUN: %verify "%s"
// #RUN: %run --no-verify --unicode-char:false --target:cs "%s" --input "%S/../../src/FileIO/FileIO.cs" -- "%S/data.txt" "System.ArgumentException:"
// #RUN: %run --no-verify --unicode-char:false --target:java "%s" --input "%S/../../src/FileIO/FileIO.java" -- "%S/data.txt" "java.io.IOException:"
// #RUN: %run --no-verify --unicode-char:false --target:js "%s" --input "%S/../../src/FileIO/FileIO.js" -- "%S/data.txt" "Error: ENOENT"
include "../../src/dafny/FileIO/FileIO.dfy"
module ReadBytesFromFile {
import Dafny.FileIO
method Main(args: seq<string>) {
expect |args| > 0;
expect |args| == 3, "usage: " + args[0] + " DATA_PATH EXPECTED_ERROR_PREFIX";
var dataPath := args[1];
var expectedErrorPrefix := args[2];
// Happy path: read from the data file, and check that we see the expected content.
{
var expectedStr := "Hello world\nGoodbye\n";
// This conversion is safe only for ASCII values. For Unicode conversions, see the Unicode modules.
var expectedBytes := seq(|expectedStr|, i requires 0 <= i < |expectedStr| => expectedStr[i] as int);
var res := FileIO.ReadBytesFromFile(dataPath);
expect res.Success?, "unexpected failure: " + res.error;
var readBytes := seq(|res.value|, i requires 0 <= i < |res.value| => res.value[i] as int);
expect readBytes == expectedBytes, "read unexpected byte sequence";
}
// Failure path: attempting to read from a blank file path should never work.
{
var res := FileIO.ReadBytesFromFile("");
expect res.Failure?, "unexpected success";
expect expectedErrorPrefix <= res.error, "unexpected error message: " + res.error;
}
}
}
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