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diff --git a/test/eslint-config.test.js b/test/eslint-config.test.js
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+++ b/test/eslint-config.test.js
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+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import esbuild from 'esbuild';
+import {readFileSync} from 'fs';
+import {dirname, join} from 'path';
+import {fileURLToPath} from 'url';
+import {describe, test} from 'vitest';
+import {parseJson} from '../dev/json.js';
+
+const rootDir = join(dirname(fileURLToPath(import.meta.url)), '..');
+
+/**
+ * @param {string[]} scriptPaths
+ * @returns {Promise<string[]>}
+ */
+async function getDependencies(scriptPaths) {
+    const v = await esbuild.build({
+        entryPoints: scriptPaths,
+        bundle: true,
+        minify: false,
+        sourcemap: true,
+        target: 'es2022',
+        format: 'esm',
+        write: false,
+        metafile: true
+    });
+    const dependencies = Object.keys(v.metafile.inputs);
+    const stringComparer = new Intl.Collator('en-US'); // Invariant locale
+    dependencies.sort((a, b) => stringComparer.compare(a, b));
+    return dependencies;
+}
+
+/**
+ * @param {string[]} dependencies
+ * @returns {string[]}
+ */
+function removeLibraryDependencies(dependencies) {
+    const pattern = /^ext\/lib\//;
+    return dependencies.filter((v) => !pattern.test(v));
+}
+
+/**
+ * @param {{[key: string]: boolean}|undefined} env1
+ * @param {{[key: string]: boolean}} env2
+ * @returns {boolean}
+ */
+function envMatches(env1, env2) {
+    if (typeof env1 !== 'object' || env1 === null) { return false; }
+    const map1 = new Map(Object.entries(env1));
+    const map2 = new Map(Object.entries(env2));
+    if (map1.size !== map2.size) { return false; }
+    for (const [k1, v1] of map1) {
+        if (map2.get(k1) !== v1) { return false; }
+    }
+    return true;
+}
+
+/**
+ * @param {string[]} files1
+ * @param {string[]} files2
+ * @returns {boolean}
+ */
+function filesMatch(files1, files2) {
+    if (!Array.isArray(files1)) { return false; }
+    const set1 = new Set(files1);
+    const set2 = new Set(files2);
+    if (set1.size !== set2.size) { return false; }
+    for (const v of set1) {
+        if (!set2.has(v)) { return false; }
+    }
+    return true;
+}
+
+const targets = [
+    {
+        name: 'sandbox',
+        paths: [
+            'ext/js/templates/sandbox/template-renderer-frame-main.js'
+        ],
+        /** @type {{[key: string]: boolean}} */
+        env: {
+            webextensions: false
+        }
+    },
+    {
+        name: 'worker',
+        paths: [
+            'ext/js/dictionary/dictionary-worker-main.js'
+        ],
+        /** @type {{[key: string]: boolean}} */
+        env: {
+            browser: false,
+            worker: true
+        }
+    },
+    {
+        name: 'serviceworker',
+        paths: [
+            'ext/js/background/background-main.js'
+        ],
+        /** @type {{[key: string]: boolean}} */
+        env: {
+            browser: false,
+            serviceworker: true
+        }
+    }
+];
+
+describe('Eslint configuration', () => {
+    const eslintConfigPath = '.eslintrc.json';
+    /** @type {import('core').SafeAny} */
+    const eslintConfig = parseJson(readFileSync(join(rootDir, eslintConfigPath), 'utf8'));
+    describe.each(targets)('Environment is $name', ({name, paths, env}) => {
+        test('Entry exists', async ({expect}) => {
+            const fullPaths = paths.map((v) => join(rootDir, v));
+            const dependencies = removeLibraryDependencies(await getDependencies(fullPaths));
+
+            let okay = false;
+            const candidates = [];
+            const {overrides} = eslintConfig;
+            for (let i = 0, ii = overrides.length; i < ii; ++i) {
+                const override = overrides[i];
+                if (!envMatches(override.env, env)) { continue; }
+                const {files} = override;
+                if (!Array.isArray(files)) { continue; }
+                candidates.push(i);
+                if (filesMatch(files, dependencies)) {
+                    okay = true;
+                    break;
+                }
+            }
+
+            if (okay) { return; }
+            switch (candidates.length) {
+                case 0:
+                    {
+                        const message = `No override found with "${name}" environment: ${JSON.stringify(env)}`;
+                        expect(false, message).toStrictEqual(true);
+                    }
+                    break;
+                case 1:
+                    {
+                        const index = candidates[0];
+                        const message = `Override at index ${index} does not have the expected files for the "${name}" environment.`;
+                        expect(overrides[index].files, message).toStrictEqual(dependencies);
+                    }
+                    break;
+                default:
+                    {
+                        const message = `No override found with the correct file list for the "${name}" environment; candidate indices: [${candidates.join(', ')}].`;
+                        expect([], message).toStrictEqual(dependencies);
+                    }
+                    break;
+            }
+        });
+    });
+});