Outsource run test method

tests/integration.js

@@ -3,15 +3,23 @@ const assert = require("chai").assert;
 const plugin = require("../lib/index.js");
 const { ESLint } = require("eslint");
 
-describe("Integration tests", () => {
-  const eslint = new ESLint({
-    fix: true,
-    overrideConfigFile: "./tests/eslint.test.config.js",
-    overrideConfig: {
-      processor: plugin.processors.processorJs,
-    },
-  });
+const eslint = new ESLint({
+  fix: true,
+  overrideConfigFile: "./tests/eslint.test.config.js",
+  overrideConfig: {
+    processor: plugin.processors.processorJs,
+    files: ["**/*.js"],
+  },
+});
+
+async function runTest(filename, expectedFilename) {
+  const testCode = fs.readFileSync(filename, "utf-8");
+  const result = await eslint.lintText(testCode, { filePath: filename });
+  const expectedCode = fs.readFileSync(expectedFilename, "utf-8");
+  assert.strictEqual(result[0].output, expectedCode);
+}
 
+describe("Integration tests (JS)", () => {
   const mapFiles = [
     "common",
     "each-do",
@@ -22,13 +30,7 @@ describe("Integration tests", () => {
   ];
   mapFiles.forEach((name) => {
     it(`performs linting as we expect it on ${name}.js`, async () => {
-      const filename = `tests/fixtures/${name}.js`;
-      const testCode = fs.readFileSync(filename, "utf-8");
-
-      const result = await eslint.lintText(testCode, { filePath: filename });
-
-      const expectedCode = fs.readFileSync(`tests/fixtures/${name}.expected.js`, "utf-8");
-      assert.strictEqual(result[0].output, expectedCode);
+      await runTest(`tests/fixtures/${name}.js`, `tests/fixtures/${name}.expected.js`, eslint);
     });
   });
 });