Add configuration for QA tools

.gitattributes

@@ -1,3 +1,9 @@
-/.gitattributes     export-ignore
-/.gitignore         export-ignore
-/README.md          export-ignore
+/.gitattributes      export-ignore
+/.gitignore          export-ignore
+/.scrutinizer.yml    export-ignore
+/.travis.yml         export-ignore
+/infection.json.dist export-ignore
+/phpcs.xml.dist      export-ignore
+/phpstan.neon.dist   export-ignore
+/phpunit.xml.dist    export-ignore
+/README.md           export-ignore

.gitignore

@@ -1,2 +1,4 @@
 /vendor/
 /composer.lock
+/.phpcs.cache
+/infection-log.txt

.scrutinizer.yml

@@ -0,0 +1,38 @@
+build:
+    environment:
+        mysql: false
+        postgresql: false
+        redis: false
+        rabbitmq: false
+        mongodb: false
+        php:
+            version: 7.2
+
+    cache:
+        disabled: false
+        directories:
+            - ~/.composer/cache
+
+    dependencies:
+        override:
+            - composer install --no-interaction --prefer-dist
+
+    nodes:
+        analysis:
+            project_setup:
+                override: true
+            tests:
+                override:
+                    - php-scrutinizer-run
+                    - phpcs-run
+
+checks:
+    php : true
+
+tools:
+    external_code_coverage: true
+
+build_failure_conditions:
+    - 'elements.rating(<= C).new.exists'
+    - 'issues.severity(>= MAJOR).new.exists'
+    - 'project.metric_change("scrutinizer.test_coverage", < -0.01)'

.travis.yml

@@ -0,0 +1,54 @@
+dist: trusty
+sudo: false
+language: php
+
+php:
+  - 7.2
+  - nightly
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+before_install:
+  - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{,.disabled} || echo "xdebug not available"
+  - composer self-update
+
+install: travis_retry composer install
+
+script:
+  - ./vendor/bin/phpunit
+
+jobs:
+  allow_failures:
+    - php: nightly
+
+  include:
+    - stage: Code Quality
+      env: TEST_COVERAGE=1
+      before_script:
+        - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{.disabled,}
+        - if [[ ! $(php -m | grep -si xdebug) ]]; then echo "xdebug required for coverage"; exit 1; fi
+      script:
+        - ./vendor/bin/phpunit --coverage-clover ./clover.xml
+      after_script:
+        - wget https://scrutinizer-ci.com/ocular.phar
+        - php ocular.phar code-coverage:upload --format=php-clover ./clover.xml
+
+    - stage: Code Quality
+      env: CODE_STANDARD=1
+      script:
+        - ./vendor/bin/phpcs
+
+    - stage: Code Quality
+      env: STATIC_ANALYSIS=1
+      script:
+        - ./vendor/bin/phpstan analyse
+
+    - stage: Code Quality
+      env: MUTATION_TESTS=1
+      before_script:
+        - mv ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini{.disabled,}
+        - if [[ ! $(php -m | grep -si xdebug) ]]; then echo "xdebug required for mutation tests"; exit 1; fi
+      script:
+        - ./vendor/bin/infection --threads=4 --min-msi=100 --min-covered-msi=100

composer.json

@@ -22,5 +22,14 @@
         "php": "^7.2",
         "fig/http-message-util": "^1.1",
         "psr/http-server-middleware": "^1.0"
+    },
+    "require-dev": {
+        "doctrine/coding-standard": "^4.0",
+        "infection/infection": "^0.8",
+        "phpstan/phpstan": "^0.10@dev",
+        "phpstan/phpstan-phpunit": "^0.10@dev",
+        "phpstan/phpstan-strict-rules": "^0.10@dev",
+        "phpunit/phpunit": "^7.0",
+        "squizlabs/php_codesniffer": "^3.2"
     }
 }

infection.json.dist

@@ -0,0 +1,9 @@
+{
+    "timeout": 1,
+    "source": {
+        "directories": ["src"]
+    },
+    "logs": {
+        "text": "infection-log.txt"
+    }
+}

phpcs.xml.dist

@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+<ruleset>
+    <arg name="basepath" value="." />
+    <arg name="extensions" value="php" />
+    <arg name="parallel" value="80" />
+    <arg name="colors" />
+    <arg name="cache" value=".phpcs.cache" />
+    <arg value="p" />
+
+    <file>src</file>
+    <file>tests</file>
+
+    <rule ref="Doctrine" />
+
+    <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
+        <properties>
+            <property name="newlinesCountBetweenOpenTagAndDeclare" value="1"/>
+            <property name="spacesCountAroundEqualsSign" value="0"/>
+            <property name="newlinesCountAfterDeclare" value="2"/>
+        </properties>
+    </rule>
+
+    <rule ref="SlevomatCodingStandard.TypeHints.ReturnTypeHintSpacing">
+        <properties>
+            <property name="spacesCountBeforeColon" value="0"/>
+        </properties>
+    </rule>
+</ruleset>

phpstan.neon.dist

@@ -0,0 +1,9 @@
+includes:
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+    - vendor/phpstan/phpstan-strict-rules/rules.neon
+
+parameters:
+    level: 7
+    paths:
+        - src
+        - tests

phpunit.xml.dist

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+    colors="true"
+    verbose="true"
+    beStrictAboutOutputDuringTests="true"
+    beStrictAboutTodoAnnotatedTests="true"
+    beStrictAboutChangesToGlobalState="true"
+    beStrictAboutCoversAnnotation="true"
+    beStrictAboutResourceUsageDuringSmallTests="true"
+    forceCoversAnnotation="true"
+>
+    <testsuites>
+        <testsuite name="unit">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>src</directory>
+        </whitelist>
+    </filter>
+</phpunit>