Update test suite to ensure 100% code coverage

Author: clue

.github/workflows/ci.yml

@@ -31,7 +31,13 @@ jobs:
           php-version: ${{ matrix.php }}
           coverage: xdebug
       - run: composer install
-      - run: vendor/bin/phpunit --coverage-text
+      - run: vendor/bin/phpunit --coverage-text --coverage-clover=clover.xml
         if: ${{ matrix.php >= 7.3 }}
-      - run: vendor/bin/phpunit --coverage-text -c phpunit.xml.legacy
+      - run: vendor/bin/phpunit --coverage-text --coverage-clover=clover.xml -c phpunit.xml.legacy
         if: ${{ matrix.php < 7.3 }}
+      - 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);

README.md

@@ -1,6 +1,7 @@
 # clue/redis-protocol
 
 [![CI status](https://github.com/clue/redis-protocol/actions/workflows/ci.yml/badge.svg)](https://github.com/clue/redis-protocol/actions)
+[![code coverage](https://img.shields.io/badge/code%20coverage-100%25-success)](#tests)
 [![installs on Packagist](https://img.shields.io/packagist/dt/clue/redis-protocol?color=blue&label=installs%20on%20Packagist)](https://packagist.org/packages/clue/redis-protocol)
 
 A streaming Redis protocol (RESP) parser and serializer written in pure PHP.
@@ -26,6 +27,7 @@ implementations.
   * [Model](#model)
   * [Serializer](#serializer)
 * [Install](#install)
+* [Tests](#tests)
 * [License](#license)
 
 ## Support us
@@ -139,11 +141,34 @@ The recommended way to install this library is [through Composer](https://getcom
 This will install the latest supported version:
 
 ```bash
-$ composer require clue/redis-protocol:^0.3.1
+composer require clue/redis-protocol:^0.3.1
 ```
 
 More details and upgrade guides can be found in the [CHANGELOG](CHANGELOG.md).
 
+## Tests
+
+To run the test suite, you first need to clone this repo and then install all
+dependencies [through Composer](https://getcomposer.org/):
+
+```bash
+composer install
+```
+
+To run the test suite, go to the project root and run:
+
+```bash
+vendor/bin/phpunit
+```
+
+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
 
 Its parser and serializer originally used to be based on

src/Clue/Redis/Protocol/Parser/ResponseParser.php

@@ -143,7 +143,6 @@ private function readResponse()
                 break;
             default:
                 throw new ParserException('Invalid message can not be parsed: "' . $reply . '"');
-                break;
         }
         /* Party on */
         return $response;