Add support for keyExists()

Closes #25

Author: greg0ire

src/Type/WebMozartAssert/AssertTypeSpecifyingExtension.php

@@ -320,6 +320,12 @@ private static function getExpressionResolvers(): array
 						new \PhpParser\Node\Name($classType->getValue())
 					);
 				},
+				'keyExists' => function (Scope $scope, Arg $array, Arg $key): \PhpParser\Node\Expr {
+					return new \PhpParser\Node\Expr\FuncCall(
+						new \PhpParser\Node\Name('array_key_exists'),
+						[$key, $array]
+					);
+				},
 				'true' => function (Scope $scope, Arg $expr): \PhpParser\Node\Expr {
 					return new \PhpParser\Node\Expr\BinaryOp\Identical(
 						$expr->value,

tests/Type/WebMozartAssert/AssertTypeSpecifyingExtensionTest.php

@@ -164,6 +164,10 @@ public function testExtension(): void
 				'Variable $af is: int',
 				126,
 			],
+			[
+				'Variable $things is: array(\'foo\' => string, \'bar\' => string)',
+				131,
+			],
 		]);
 	}
 

tests/Type/WebMozartAssert/data/data.php

@@ -124,6 +124,11 @@ public function doFoo($a, $b, array $c, iterable $d, $e, $f, $g, $h, $i, $j, $k,
         /** @var int|false $af */
         Assert::notFalse($af);
         $af;
+
+		/** @var array{foo?: string, bar?: string} $things */
+		$things = doFoo();
+		Assert::keyExists($things, 'foo');
+		$things;
     }
 
 }