Add GitHub actions to run unit tests

.github/workflows/php.yml

@@ -0,0 +1,34 @@
+name: PHP Composer
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+
+    - name: Cache Composer packages
+      id: composer-cache
+      uses: actions/cache@v2
+      with:
+        path: vendor
+        key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-php-
+
+    - name: Install dependencies
+      if: steps.composer-cache.outputs.cache-hit != 'true'
+      run: composer install --prefer-dist --no-progress --no-suggest
+
+    - name: Run test suite
+      run: vendor/bin/phpunit

Tests/Service/Request/RequestFactoryTest.php

@@ -264,7 +264,7 @@ public function testBuildFlowWithQueryParams()
      */
     public function testBuildFlowValidationFailsOnUnmappedRequestArguments()
     {
-        $this->setExpectedException(InvalidArgumentException::class);
+        $this->expectException(InvalidArgumentException::class);
 
         $baseUrl = 'baseUrl';
         $routeString = 'routeString\{invalidArgument}';

Tests/Service/Response/ResponseTransformerTest.php

@@ -114,7 +114,7 @@ public function testTransformSuccess()
      */
     public function testTransformFails()
     {
-        static::setExpectedException(ResponseException::class);
+        $this->expectException(ResponseException::class);
 
         $responseBodyContent = '{$responseBodyContent:$responseBodyContent}';
         $failedStatusCode = Response::HTTP_INTERNAL_SERVER_ERROR;

composer.json

@@ -37,7 +37,7 @@
     "require-dev": {
         "symfony/yaml": "~3.0|~4.0|~5.0",
         "symfony/console": "~3.0|~4.0|~5.0",
-        "phpunit/phpunit": "^4.8",
+        "phpunit/phpunit": "^6.5",
         "symfony/phpunit-bridge": "^3.3.8",
         "phpspec/prophecy": "^1.7.2"
     },