test: Ensure all rules are exported

tests/package/exports.js

@@ -9,6 +9,17 @@
 
 import * as exports from "../../src/index.js";
 import assert from "node:assert";
+import path from "node:path";
+import fs from "node:fs/promises";
+import { fileURLToPath, pathToFileURL } from "node:url";
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const filename = fileURLToPath(import.meta.url);
+const dirname = path.dirname(filename);
+const rulesDir = path.resolve(dirname, "../../src/rules");
 
 //------------------------------------------------------------------------------
 // Tests
@@ -24,6 +35,32 @@ describe("Package exports", () => {
 		]);
 	});
 
+	it("has all available rules exported in the ESLint plugin", async () => {
+		const allRules = (await fs.readdir(rulesDir))
+			.filter(name => name.endsWith(".js"))
+			.map(name => name.slice(0, -".js".length))
+			.sort();
+		const exportedRules = exports.default.rules;
+
+		assert.deepStrictEqual(
+			Object.keys(exportedRules).sort(),
+			allRules,
+			"Expected all rules to be exported in the ESLint plugin (`plugin.rules` in `src/index.js`)",
+		);
+
+		for (const [ruleName, rule] of Object.entries(exportedRules)) {
+			assert.strictEqual(
+				rule,
+				(
+					await import(
+						pathToFileURL(path.resolve(rulesDir, `${ruleName}.js`))
+					)
+				).default,
+				`Expected ${ruleName}.js to be exported under key "${ruleName}" in the ESLint plugin (\`plugin.rules\` in \`src/index.js\`)`,
+			);
+		}
+	});
+
 	it("has a JSONLanguage export", () => {
 		assert.ok(exports.JSONLanguage);
 	});

tests/plugin/eslint.test.js

@@ -19,6 +19,25 @@ import dedent from "dedent";
 //-----------------------------------------------------------------------------
 
 describe("when the plugin is used with ESLint", () => {
+	describe("plugin configs", () => {
+		Object.keys(json.configs).forEach(configName => {
+			it(`Using "${configName}" config should not throw`, async () => {
+				const config = {
+					files: ["**/*.json"],
+					language: "json/json",
+					...json.configs[configName],
+				};
+
+				const eslint = new ESLint({
+					overrideConfigFile: true,
+					overrideConfig: config,
+				});
+
+				await eslint.lintText("{}", { filePath: "test.json" });
+			});
+		});
+	});
+
 	describe("config comments", () => {
 		["jsonc", "json5"].forEach(language => {
 			describe(`with ${language} language`, () => {