diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b912ba..06c449c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,7 +33,13 @@ jobs:
           php-version: ${{ matrix.php }}
           coverage: xdebug
       - run: composer install
-      - run: vendor/bin/phpunit --coverage-text ${{ matrix.php < 7.3 && '-c phpunit.xml.legacy' || '' }}
+      - run: vendor/bin/phpunit --coverage-text --coverage-clover clover.xml ${{ matrix.php < 7.3 && '-c phpunit.xml.legacy' || '' }}
+      - name: Check 100% code coverage
+        shell: php {0}
+        run: |
+          <?php
+          $metrics = simplexml_load_file('clover.xml')->project->metrics;
+          exit((int) $metrics['statements'] === (int) $metrics['coveredstatements'] ? 0 : 1);
 
   PHPUnit-hhvm:
     name: PHPUnit (HHVM)
diff --git a/README.md b/README.md
index ad9126b..0b4db17 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # clue/reactphp-http-proxy
 
 [![CI status](https://github.com/clue/reactphp-http-proxy/actions/workflows/ci.yml/badge.svg)](https://github.com/clue/reactphp-http-proxy/actions)
+[![code coverage](https://img.shields.io/badge/code%20coverage-100%25-success)](#tests)
 [![installs on Packagist](https://img.shields.io/packagist/dt/clue/http-proxy-react?color=blue&label=installs%20on%20Packagist)](https://packagist.org/packages/clue/http-proxy-react)
 
 Async HTTP proxy connector, tunnel any TCP/IP-based protocol through an HTTP
@@ -483,6 +484,14 @@ alternatively you can also run it like this:
 vendor/bin/phpunit --exclude-group internet
 ```
 
+The test suite is set up to always ensure 100% code coverage across all
+supported environments. If you have the Xdebug extension installed, you can also
+generate a code coverage report locally like this:
+
+```bash
+XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-text
+```
+
 ## License
 
 This project is released under the permissive [MIT license](LICENSE).
diff --git a/src/ProxyConnector.php b/src/ProxyConnector.php
index 3cb6b22..2e3575b 100644
--- a/src/ProxyConnector.php
+++ b/src/ProxyConnector.php
@@ -71,7 +71,7 @@ public function __construct(
             // connector uses Unix transport scheme and explicit path given
             $connector = new FixedUriConnector(
                 'unix://' . $match[2],
-                $connector ?: new UnixConnector()
+                $connector ?: new UnixConnector() // @codeCoverageIgnore
             );
         }
 
@@ -262,7 +262,7 @@ public function connect($uri)
             // what a lovely piece of code!
             $r = new \ReflectionProperty('Exception', 'trace');
             if (PHP_VERSION_ID < 80100) {
-                $r->setAccessible(true);
+                $r->setAccessible(true); // @codeCoverageIgnore
             }
             $trace = $r->getValue($e);