Add PHP 8.0 support

Add PHP 8.0 to the build matrix
Enable composer caching
Change dependencies for PHP 8
Remove composer.lock file
Use Yoast PhpUnitPolyfill base test case in PsrStreamInterfaceImplTest
Fix boolean encoding
Fix exception handling in PHP 8

Author: tkm

.github/workflows/test.yml

@@ -12,21 +12,46 @@ jobs:
   build:
     strategy:
       matrix:
-        php: [5.6, 7.0, 7.1, 7.2, 7.3, 7.4]
+        include:
+          - php: 5.6
+            phpunit: 5
+          - php: '7.0'
+            phpunit: 6
+          - php: 7.1
+            phpunit: 7
+          - php: 7.2
+            phpunit: 8
+          - php: 7.3
+            phpunit: 9
+          - php: 7.4
+            phpunit: 9
+          - php: '8.0'
+            phpunit: 9
 
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
-      
+
     - name: Install PHP
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php }}
         coverage: none
 
+    - name: Cache Composer dependencies
+      uses: actions/cache@v2
+      with:
+        path: /tmp/composer-cache
+        key: php${{ matrix.php }}-${{ hashFiles('**/composer.json') }}
+
     - name: Install dependencies
-      run: | 
-        composer --no-plugins --no-scripts install
-        composer --no-plugins --no-scripts dump-autoload -o
-        vendor/bin/phpunit --configuration ./phpunit.xml --teamcity
+      uses: php-actions/composer@v5
+      with:
+        php_version: ${{ matrix.php }}
+
+    - name: Run tests
+      uses: php-actions/phpunit@v3
+      with:
+        php_version: ${{ matrix.php }}
+        version: ${{ matrix.phpunit }}

composer.json

@@ -18,11 +18,12 @@
         }
     ],
     "require": {
-        "phpseclib/phpseclib": "^2.0"
+        "phpseclib/phpseclib": "^2.0",
+        "symfony/polyfill-php70": "^1.19"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7",
-        "guzzlehttp/guzzle": "^6.2"
+        "guzzlehttp/guzzle": "^6.2",
+        "yoast/phpunit-polyfills": "^1.0"
     },
     "suggest": {
         "psr/http-message": "Allow usage of the PsrHttpMessageEncryptionInterceptor class"