Add phpstan-deprecated and -unit

.gitignore

@@ -2,3 +2,4 @@
 vendor
 composer.lock
 .phpunit.result.cache
+/data/

composer.json

@@ -23,13 +23,16 @@
       "@tests-spec"
     ],
     "tests": "phpunit tests",
-    "analyze": "phpstan analyse --level max src",
+    "analyze": "phpstan analyse --level max",
     "tests-spec": "phpspec run --no-interaction"
   },
   "require-dev": {
     "phpspec/phpspec": "^6.2",
-    "phpunit/phpunit": "^9.3",
-    "phpstan/phpstan": "^0.12"
+    "phpunit/phpunit": "^9.4",
+    "phpstan/phpstan": "^0.12.51",
+    "phpstan/phpstan-deprecation-rules": "^0.12.4",
+    "phpstan/phpstan-phpunit": "^0.12.16",
+    "squizlabs/php_codesniffer": "^3.5.5"
   },
   "autoload": {
     "psr-4": {

phpstan.neon.dist

@@ -0,0 +1,8 @@
+includes:
+  - vendor/phpstan/phpstan-phpunit/extension.neon
+  - vendor/phpstan/phpstan-deprecation-rules/rules.neon
+parameters:
+  tmpDir: data
+  level: max
+  paths:
+    - src

phpunit.xml.dist

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation = "./vendor/phpunit/phpunit/phpunit.xsd"
+         cacheResultFile="./data/phpunit.result.cache"
+         colors                        = "true">
+    <testsuites>
+        <testsuite name="Unit">
+            <directory suffix="Test.php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>