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test.mjs
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test.mjs
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import { compile } from "./src/compiler.mjs";
let inputBuffer = [];
let outputBuffer = [];
const testTable = [
{
name: "Simple increment",
program: "+++",
expected: [3]
},
{
name: "Non-BF characters are ignored",
program: "+++X+++",
expected: [6]
},
{
name: "Adding respects pointer position",
program: "+++>++",
expected: [3, 2]
},
{
name: "Subtractting respects pointer position",
program: "+++>++<--",
expected: [1, 2]
},
{
name: "Simple loop",
program: "+++[>++<-]",
expected: [0, 6]
},
{
name: "Loops should be skipped on 0",
program: "[+>]",
expected: [0, 0]
},
{
name: "Instructions after loop are executed",
program: "+++[>]<+++",
expected: [6]
},
{
name: "Code after skipped loops should be executed",
program: "[+>]>+",
expected: [0, 1]
},
{
name: "Nested loops",
program: "+++[>++[>++<-]<-]",
expected: [0, 0, 12]
},
{
name: "Wrap at 256",
program: "++++++++[>++++++++[>++++<-]<-]",
expected: [0, 0, 0]
},
{
name: "Can consume input",
pre() {
inputBuffer = [123];
},
program: ",",
expected: [123]
},
{
name: "Can produce output",
program: "+++.",
expected: [3],
post() {
console.assert(
outputBuffer[0] === 3,
`Unexpected output buffer: ${outputBuffer}`
);
}
},
{
name: "Underflow is limited to cell",
program: ">-.<.",
post() {
console.assert(
outputBuffer[0] === 255 && outputBuffer[1] === 0,
`Unexpected output buffer: ${outputBuffer}`
);
}
},
{
name: "Respects exportPointer flag",
program: "+",
options: {
exportPointer: false
},
post(instance) {
console.assert(
typeof instance.exports.pointer === "undefined",
"Module exposes pointer despite `exportPointer: false`"
);
}
},
{
name: "Respects exportMemory flag",
program: "+",
options: {
exportMemory: false
},
post(instance) {
console.assert(
typeof instance.exports.memory === "undefined",
"Module exposes memory despite `exportMemory: false`"
);
}
}
];
const importObj = {
env: {
in() {
return inputBuffer.shift();
},
out(v) {
outputBuffer.push(v);
}
}
};
async function init() {
for (const {
name,
pre = () => {},
program,
options = {},
expected = [],
post = () => {}
} of testTable) {
inputBuffer = [];
outputBuffer = [];
pre();
console.log(`Running "${name}"`);
const wasm = compile(program, options);
const { instance } = await WebAssembly.instantiate(wasm, importObj);
instance.exports._start();
const memory = new Uint8Array(
(instance.exports.memory || new Uint8Array([])).buffer
);
const relevantMemory = [...memory.slice(0, expected.length)];
console.assert(
JSON.stringify(relevantMemory) === JSON.stringify(expected),
`Error running program "${name}": Expected memory to be ${JSON.stringify(
expected
)}, got ${JSON.stringify(relevantMemory)}`
);
post(instance);
}
}
init();