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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// Run this test with `deno test --unstable-ffi -A compare_with_rust.ts`
import { unicodeWidth } from "../unicode_width.ts";import { fromFileUrl } from "../../path/mod.ts";import fc from "https://esm.sh/fast-check@3.8.0";
// Note: This test is optional. It requires the Rust code to be compiled locallyDeno.test("fast-check equality with unicode_width Rust crate", async (t) => {  const libName = ({    darwin: "libunicode_width_crate.dylib",    linux: "libunicode_width_crate.so",    windows: "libunicode_width_crate.dll",    // deno-lint-ignore no-explicit-any  } as any)[Deno.build.os];  const libPath = fromFileUrl(    import.meta.resolve(      `../testdata/unicode_width_crate/target/debug/${libName}`,    ),  );
  const toCString = (str: string) => new TextEncoder().encode(str + "\0");
  // @ts-ignore type-check errors if unavailable due to lack of --unstable-ffi flag  let dylib: Deno.DynamicLibrary<{    unicode_width: { parameters: ["buffer"]; result: "usize" };  }>;
  try {    dylib = Deno.dlopen(libPath, {      unicode_width: { parameters: ["buffer"], result: "usize" },    });
    for (      const arbitrary of [        "string",        "unicodeString",        "fullUnicodeString",      ] as const    ) {      await t.step({        name: `fc.${arbitrary}()`,        fn() {          // To avoid esm.sh statically analyzed          fc.assert(            fc.property(              fc[arbitrary](),              // JSON stringify to allow "\0" chars to cross FFI boundary in a null-terminated string              // deno-lint-ignore no-explicit-any              (str: any) =>                unicodeWidth(str) ===                  dylib.symbols.unicode_width(toCString(JSON.stringify(str))),            ),          );        },      });    }  } finally {    // deno-lint-ignore no-extra-non-null-assertion    dylib!?.close();  }});