hack for phpunit 8 compatibility

.github/workflows/ci.yml

@@ -37,16 +37,31 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
-      - name: Delete composer lock file
+      - name: Update PHPUnit version for PHP 8
         id: composer-lock
         if: "startsWith(matrix.php-version, '8.')"
         run: |
           rm -f composer.lock
           echo "::set-output name=flags::--ignore-platform-reqs"
+          composer remove phpunit/phpunit --dev --no-update --no-interaction
+          composer require phpunit/phpunit ^8.0 --dev --no-update
 
       - name: Install dependencies
         run: composer update --no-progress --prefer-dist --optimize-autoloader ${{ steps.composer-lock.outputs.flags }}
 
+      - name: Update code to make PHPUnit 8 compatible
+        if: "startsWith(matrix.php-version, '8.')"
+        run: |
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function setUpBeforeClass()$/function setUpBeforeClass(): void/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function tearDownAfterClass()$/function tearDownAfterClass(): void/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function setUp()$/function setUp(): void/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/function tearDown()$/function tearDown(): void/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/->assertContains(/->assertStringContainsString(/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e 's/->assertNotContains(/->assertStringNotContainsString(/' {} \;
+          find ./tests/ -name "*.php" -type f -exec sed -i -e "s/->assertInternalType('array', /->assertIsArray(/" {} \;
+          sed -i "s/\$this->addWarning('The @expectedException,/\/\/\$this->addWarning('The @expectedException,/" ./vendor/phpunit/phpunit/src/Framework/TestCase.php
+          sed -i "s/self::createWarning('The optional \$delta/\/\/self::createWarning('The optional \$delta/" ./vendor/phpunit/phpunit/src/Framework/Assert.php
+
       - name: Setup problem matchers for PHP
         run: echo "::add-matcher::${{ runner.tool_cache }}/php.json"
 
@@ -57,7 +72,7 @@ jobs:
         uses: mheap/phpunit-matcher-action@v1
 
       - name: Test with PHPUnit
-        run: ./vendor/bin/phpunit --teamcity -c ./
+        run: ./vendor/bin/phpunit --teamcity --no-coverage -c ./
 
   php-cs-fixer:
     runs-on: ubuntu-latest