diff --git a/src/generator.ts b/src/generator.ts
index 16ee959..d4227e9 100644
--- a/src/generator.ts
+++ b/src/generator.ts
@@ -271,12 +271,18 @@ export class Generator {
     let gitIgnore = '';
     if (fs.existsSync(gitIgnorePath))
       gitIgnore = fs.readFileSync(gitIgnorePath, 'utf-8').trimEnd() + '\n';
-    if (!gitIgnore.includes('node_modules'))
-      gitIgnore += 'node_modules/\n';
-    gitIgnore += '/test-results/\n';
-    gitIgnore += '/playwright-report/\n';
-    gitIgnore += '/blob-report/\n';
-    gitIgnore += '/playwright/.cache/\n';
+    const valuesToAdd = { 
+      'node_modules/': /^node_modules\/?/m,
+      '/test-results/': /^\/?test-results\/?$/m,
+      '/playwright-report/': /^\/playwright-report\/?$/m,
+      '/blob-report/': /^\/blob-report\/?$/m,
+      '/playwright/.cache/': /^\/playwright\/\.cache\/?$/m
+    };
+    Object.entries(valuesToAdd).forEach(([value, regex]) => {
+      if (!gitIgnore.match(regex)) {
+        gitIgnore += `${value}\n`;
+      }
+    });
     fs.writeFileSync(gitIgnorePath, gitIgnore);
   }
 
diff --git a/tests/integration.spec.ts b/tests/integration.spec.ts
index 81b4013..a10c1f7 100644
--- a/tests/integration.spec.ts
+++ b/tests/integration.spec.ts
@@ -18,6 +18,14 @@ import path from 'path';
 import fs from 'fs';
 import childProcess from 'child_process';
 
+const validGitignore = [
+  'node_modules/',
+  '/test-results/',
+  '/playwright-report/',
+  '/blob-report/',
+  '/playwright/.cache/',
+].join('\n');
+
 test('should generate a project in the current directory', async ({ run, dir, packageManager }) => {
   test.slow();
   const { stdout } = await run([], { installGitHubActions: true, testDir: 'tests', language: 'TypeScript', installPlaywrightDependencies: false, installPlaywrightBrowsers: true });
@@ -29,6 +37,7 @@ test('should generate a project in the current directory', async ({ run, dir, pa
   expect(playwrightConfigContent).toContain('tests');
   expect(fs.existsSync(path.join(dir, '.github/workflows/playwright.yml'))).toBeTruthy();
   expect(fs.existsSync(path.join(dir, '.gitignore'))).toBeTruthy();
+  expect(fs.readFileSync(path.join(dir, '.gitignore'), { encoding: 'utf8' }).trim()).toBe(validGitignore);
   if (packageManager === 'npm') {
     expect(stdout).toContain('Initializing NPM project (npm init -y)…');
     expect(stdout).toContain('Installing Playwright Test (npm install --save-dev @playwright/test)…');
@@ -102,6 +111,13 @@ test('should generate in the root of pnpm workspace', async ({ run, packageManag
   expect(fs.existsSync(path.join(dir, 'playwright.config.ts'))).toBeTruthy();
 });
 
+test('should not duplicate gitignore entries', async ({ run, dir }) => {
+  fs.writeFileSync(path.join(dir, '.gitignore'), validGitignore);
+
+  await run([], { installGitHubActions: false, testDir: 'tests', language: 'TypeScript', installPlaywrightDependencies: false, installPlaywrightBrowsers: false });
+  expect(fs.readFileSync(path.join(dir, '.gitignore'), { encoding: 'utf8' }).trim()).toBe(validGitignore);
+})
+
 test('should install with "npm ci" in GHA when using npm with package-lock enabled', async ({ dir, run, packageManager }) => {
   test.skip(packageManager !== 'npm');