Add tests

Author: sayuprc

tests/PHPStan/Rules/Classes/InstantiationRuleTest.php

@@ -499,4 +499,34 @@ public function testBug10248(): void
 		$this->analyse([__DIR__ . '/data/bug-10248.php'], []);
 	}
 
+	public function testClassString(): void
+	{
+		$this->analyse([__DIR__ . '/data/class-string.php'], [
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				21,
+			],
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				22,
+			],
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				23,
+			],
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				26,
+			],
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				27,
+			],
+			[
+				'Parameter #1 $i of class ClassString\A constructor expects int, string given.',
+				29,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Classes/data/class-string.php

@@ -0,0 +1,35 @@
+<?php declare(strict_types = 1);
+
+namespace ClassString;
+
+class A
+{
+    public $i;
+
+    public function __construct(int $i)
+    {
+        $this->i = $i;
+    }
+}
+
+class HelloWorld
+{
+    /**
+     * @return class-string<A>
+     */
+    public static function sayHelloBug(): string
+    {
+        return A::class;
+    }
+}
+
+$classString = HelloWorld::sayHelloBug();
+$bug = new (HelloWorld::sayHelloBug())('O_O');
+$bug = new ($classString)('O_O');
+$bug = new $classString('O_O');
+
+$className = A::class;
+$ok = new ($className)('O_O');
+$ok = new $className('O_O');
+
+$ok = new A('O_O');