add phptan to allow plugin

composer.json

@@ -23,7 +23,10 @@
         ]
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     },
     "require": {
         "php": "^7.4 || ^8.0",

tests/e2e/Codeception_Basic/composer.json

@@ -15,6 +15,11 @@
     },
     "require": {
         "infection/infection": "0.25.0",
-        "infection/codeception-adapter": "dev-master"
+        "infection/codeception-adapter": "dev-non-default-codeception-config-path"
+    },
+    "config": {
+        "allow-plugins": {
+            "infection/extension-installer": true
+        }
     }
 }

tests/e2e/Codeception_Basic/tests/unit/SourceClassTest.php

@@ -31,6 +31,6 @@ public function test_it_can_add_small_numbers()
     {
         $source = new SourceClass();
 
-        $this->assertSame(0.3, $source->add(0.1, 0.2));
+        $this->assertSame(0.3, round($source->add(0.1, 0.2), 1));
     }
 }