Integration test for coalesce

Author: ondrejmirtes

tests/PHPStan/Levels/LevelsIntegrationTest.php

@@ -32,6 +32,7 @@ public function dataTopics(): array
 			['missingReturn'],
 			['arrayAccess'],
 			['typehints'],
+			['coalesce'],
 		];
 	}
 

tests/PHPStan/Levels/data/coalesce-0.json

@@ -0,0 +1,7 @@
+[
+    {
+        "message": "Undefined variable: $bar",
+        "line": 6,
+        "ignorable": true
+    }
+]

tests/PHPStan/Levels/data/coalesce-1.json

@@ -0,0 +1,12 @@
+[
+    {
+        "message": "Variable $foo on left side of ?? is never defined.",
+        "line": 4,
+        "ignorable": true
+    },
+    {
+        "message": "Property ReflectionClass<object>::$name (class-string<object>) on left side of ?? is not nullable.",
+        "line": 10,
+        "ignorable": true
+    }
+]

tests/PHPStan/Levels/data/coalesce-2.json

@@ -0,0 +1,7 @@
+[
+    {
+        "message": "Access to an undefined property ReflectionClass::$nonexistent.",
+        "line": 11,
+        "ignorable": true
+    }
+]

tests/PHPStan/Levels/data/coalesce.php

@@ -0,0 +1,12 @@
+<?php
+
+function (): void {
+	echo $foo ?? 'foo';
+
+	echo $bar->bar ?? 'foo';
+};
+
+function (\ReflectionClass $ref): void {
+	echo $ref->name ?? 'foo';
+	echo $ref->nonexistent ?? 'bar';
+};