Fix printing nodes

* Add `toString()` tests for all nodes

* Fix printing array shapes

* Improve callable type printing

* Add missing function import

src/Ast/Type/ArrayShapeNode.php

@@ -27,7 +27,7 @@ public function __toString(): string
 	{
 		$items = $this->items;
 
-		if ($this->sealed) {
+		if (! $this->sealed) {
 			$items[] = '...';
 		}
 

src/Ast/Type/CallableTypeParameterNode.php

@@ -4,6 +4,7 @@
 
 use PHPStan\PhpDocParser\Ast\Node;
 use PHPStan\PhpDocParser\Ast\NodeAttributes;
+use function trim;
 
 class CallableTypeParameterNode implements Node
 {
@@ -41,7 +42,7 @@ public function __toString(): string
 		$isReference = $this->isReference ? '&' : '';
 		$isVariadic = $this->isVariadic ? '...' : '';
 		$default = $this->isOptional ? ' = default' : '';
-		return "{$type}{$isReference}{$isVariadic}{$this->parameterName}{$default}";
+		return trim("{$type}{$isReference}{$isVariadic}{$this->parameterName}") . $default;
 	}
 
 }

tests/PHPStan/Ast/ToString/ConstExprToStringTest.php

@@ -0,0 +1,52 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\PhpDocParser\Ast\ToString;
+
+use Generator;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprArrayItemNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprArrayNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprFalseNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprFloatNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprIntegerNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprNullNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprStringNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstExprTrueNode;
+use PHPStan\PhpDocParser\Ast\ConstExpr\ConstFetchNode;
+use PHPStan\PhpDocParser\Ast\Node;
+use PHPUnit\Framework\TestCase;
+
+class ConstExprToStringTest extends TestCase
+{
+
+	/**
+	 * @dataProvider provideConstExprCases
+	 */
+	public function testToString(string $expected, Node $node): void
+	{
+		$this->assertSame($expected, (string) $node);
+	}
+
+	public static function provideConstExprCases(): Generator
+	{
+		yield from [
+			['null', new ConstExprNullNode()],
+			['true', new ConstExprTrueNode()],
+			['false', new ConstExprFalseNode()],
+			['8', new ConstExprIntegerNode('8')],
+			['21.37', new ConstExprFloatNode('21.37')],
+			['foo', new ConstExprStringNode('foo')],
+			['FooBar', new ConstFetchNode('', 'FooBar')],
+			['Foo\\Bar::Baz', new ConstFetchNode('Foo\\Bar', 'Baz')],
+			['[]', new ConstExprArrayNode([])],
+			[
+				'[foo, 4 => foo, bar => baz]',
+				new ConstExprArrayNode([
+					new ConstExprArrayItemNode(null, new ConstExprStringNode('foo')),
+					new ConstExprArrayItemNode(new ConstExprIntegerNode('4'), new ConstExprStringNode('foo')),
+					new ConstExprArrayItemNode(new ConstExprStringNode('bar'), new ConstExprStringNode('baz')),
+				]),
+			],
+		];
+	}
+
+}