Improve test coverage

deno.json

@@ -4,7 +4,7 @@
  "test": { "include": ["src/", "test/"] },
  "tasks": {
  "gen": "deno run --allow-read --allow-write ./src/main.ts",
- "test": "deno test --allow-read --allow-write"
+ "test": "deno test --allow-read --allow-write --parallel --shuffle"
  },
  "imports": {
  "@libs/xml": "jsr:@libs/[email protected]",

src/libs/io.ts

@@ -6,12 +6,12 @@ import { convertToOPML, convertToTOML } from "./mod.ts";
 export async function readTOML(file: string): Promise<Lists> {
  try {
  const data: string = await Deno.readTextFile(file);
- return await convertToTOML(data);
+ return convertToTOML(data);
  } catch (error) {
  if (error instanceof Deno.errors.NotFound) {
- throw Error(`File not found: "${file}"`);
+ throw new Error(`File not found: "${file}"`);
  } else if (error instanceof Deno.errors.PermissionDenied) {
- throw Error(`Permission denied: "${file}"`);
+ throw new Error(`Permission denied: "${file}"`);
  } else throw error;
  }
 }

test/libs/io_test.ts

@@ -1,4 +1,4 @@
-import { assertEquals } from "@std/assert";
+import { assertEquals, assertIsError } from "@std/assert";
 import { join } from "@std/path";
 import {
  convertToOPML,
@@ -25,6 +25,32 @@ xmlUrl = "https://example.com/feed"
  assertEquals(convertToTOML(toml), lists);
 });
 
+Deno.test("Read TOML (File not found)", async () => {
+ try {
+ await readTOML("file-not-found.toml");
+ } catch (error) {
+ assertEquals(error.message, 'File not found: "file-not-found.toml"');
+ }
+});
+
+Deno.test("Read TOML (Permission denied)", async () => {
+ const file: string = await Deno.makeTempFile({ suffix: ".toml" });
+ await Deno.chmod(file, 0o000);
+ try {
+ await readTOML(file);
+ } catch (error) {
+ assertEquals(error.message, `Permission denied: "${file}"`);
+ }
+});
+
+Deno.test("Read TOML (Unexpected error)", async () => {
+ try {
+ await readTOML("");
+ } catch (error) {
+ assertIsError(error);
+ }
+});
+
 Deno.test("Write XML", async () => {
  const feeds: Lists = {
  lists: [