diff --git a/.eslintrc.js b/.eslintrc.js
index 4483568..5c970d2 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -12,7 +12,7 @@ module.exports = {
                 object: "context",
                 property: "getScope",
                 message:
-                    "If you are using it in a test case, use test/test-lib/get-scope.mjs instead. Other than that, the API should also be compatible with ESLint v9.",
+                    "If you are using it in a test case, use test/test-lib/eslint-compat.mjs#getScope instead. Other than that, the API should also be compatible with ESLint v9.",
             },
         ],
     },
diff --git a/package.json b/package.json
index 14352f6..d8f265d 100644
--- a/package.json
+++ b/package.json
@@ -54,6 +54,7 @@
     },
     "devDependencies": {
         "@eslint-community/eslint-plugin-mysticatea": "^15.6.1",
+        "@types/eslint": "^8.56.12",
         "c8": "^8.0.1",
         "dot-prop": "^7.2.0",
         "eslint": "^8.57.1",
diff --git a/test/find-variable.mjs b/test/find-variable.mjs
index 6b6e71c..849f1c1 100644
--- a/test/find-variable.mjs
+++ b/test/find-variable.mjs
@@ -1,7 +1,7 @@
 import assert from "assert"
 import eslint from "eslint"
 import { findVariable } from "../src/index.mjs"
-import { getScope } from "./test-lib/get-scope.mjs"
+import { getScope } from "./test-lib/eslint-compat.mjs"
 
 describe("The 'findVariable' function", () => {
     function getVariable(code, selector, withString = null) {
diff --git a/test/get-innermost-scope.mjs b/test/get-innermost-scope.mjs
index 4370327..9c85bb0 100644
--- a/test/get-innermost-scope.mjs
+++ b/test/get-innermost-scope.mjs
@@ -1,7 +1,7 @@
 import assert from "assert"
 import eslint from "eslint"
 import { getInnermostScope } from "../src/index.mjs"
-import { getScope } from "./test-lib/get-scope.mjs"
+import { getScope } from "./test-lib/eslint-compat.mjs"
 
 describe("The 'getInnermostScope' function", () => {
     let i = 0
diff --git a/test/get-static-value.mjs b/test/get-static-value.mjs
index 9ca05c6..0bf1a2e 100644
--- a/test/get-static-value.mjs
+++ b/test/get-static-value.mjs
@@ -2,7 +2,7 @@ import assert from "assert"
 import eslint from "eslint"
 import semver from "semver"
 import { getStaticValue } from "../src/index.mjs"
-import { getScope } from "./test-lib/get-scope.mjs"
+import { getScope } from "./test-lib/eslint-compat.mjs"
 
 describe("The 'getStaticValue' function", () => {
     for (const { code, expected, noScope = false } of [
diff --git a/test/get-string-if-constant.mjs b/test/get-string-if-constant.mjs
index 5d8cba0..f400fd6 100644
--- a/test/get-string-if-constant.mjs
+++ b/test/get-string-if-constant.mjs
@@ -1,7 +1,7 @@
 import assert from "assert"
 import eslint from "eslint"
 import { getStringIfConstant } from "../src/index.mjs"
-import { getScope } from "./test-lib/get-scope.mjs"
+import { getScope } from "./test-lib/eslint-compat.mjs"
 
 describe("The 'getStringIfConstant' function", () => {
     for (const { code, expected } of [
diff --git a/test/reference-tracker.mjs b/test/reference-tracker.mjs
index 6e9f14a..52993be 100644
--- a/test/reference-tracker.mjs
+++ b/test/reference-tracker.mjs
@@ -2,7 +2,7 @@ import assert from "assert"
 import eslint from "eslint"
 import semver from "semver"
 import { CALL, CONSTRUCT, ESM, READ, ReferenceTracker } from "../src/index.mjs"
-import { getScope } from "./test-lib/get-scope.mjs"
+import { getScope } from "./test-lib/eslint-compat.mjs"
 
 const config = {
     parserOptions: {
diff --git a/test/test-lib/eslint-compat.mjs b/test/test-lib/eslint-compat.mjs
new file mode 100644
index 0000000..abaf70b
--- /dev/null
+++ b/test/test-lib/eslint-compat.mjs
@@ -0,0 +1,5 @@
+export const getScope = (context, node) =>
+    getSourceCode(context).getScope?.(node) ?? context.getScope();
+
+const getSourceCode = (context) =>
+    context.sourceCode ?? context.getSourceCode();
diff --git a/test/test-lib/get-scope.mjs b/test/test-lib/get-scope.mjs
deleted file mode 100644
index 765b6c8..0000000
--- a/test/test-lib/get-scope.mjs
+++ /dev/null
@@ -1,18 +0,0 @@
-export function getScope(context, node) {
-    const sourceCode = context.sourceCode || context.getSourceCode()
-    if (sourceCode.getScope) {
-        return sourceCode.getScope(node)
-    }
-    const scopeManager = sourceCode.scopeManager
-    const inner = node.type !== "Program"
-    for (let n = node; n; n = n.parent) {
-        const scope = scopeManager.acquire(n, inner)
-        if (scope) {
-            if (scope.type === "function-expression-name") {
-                return scope.childScopes[0]
-            }
-            return scope
-        }
-    }
-    return scopeManager.scopes[0]
-}