add more testcase for generic types

Author: Flyingmana

tests/PHPStan/Rules/Functions/MissingFunctionReturnTypehintRuleTest.php

@@ -66,6 +66,22 @@ public function testRule(): void
 				'Function MissingFunctionReturnTypehint\returnsGeneratorOfIntegersByStringNoPrototype() return type with generic class Generator does not specify its types: TKey, TValue, TSend, TReturn',
 				169,
 			],
+			[
+				'Function MissingFunctionReturnTypehint\returnsIteratorNoPrototype() return type with generic interface Iterator does not specify its types: TKey, TValue, TSend, TReturn',
+				186,
+			],
+			[
+				'Function MissingFunctionReturnTypehint\returnsIteratorAggregateNoPrototype() return type with generic interface IteratorAggregate does not specify its types: TKey, TValue, TSend, TReturn',
+				199,
+			],
+			[
+				'Function MissingFunctionReturnTypehint\returnsTraversableNoPrototype() return type has no value type specified in iterable type Traversable',
+				212,
+			],
+			[
+				'Function MissingFunctionReturnTypehint\returnsTraversableNoPrototype() return type with generic interface Traversable does not specify its types: TKey, TValue, TSend, TReturn',
+				212,
+			],
 		]);
 	}
 

tests/PHPStan/Rules/Functions/data/missing-function-return-typehint.php

@@ -176,10 +176,49 @@ function returnsGeneratorOfIntegersByStringNoPrototype(): \Generator
 	/**
 	 * @return \Generator<string, int>
 	 */
-	function returnsGeneratorOfIntegersByStringwithPrototype(): \Generator
+	function returnsGeneratorOfIntegersByStringWithPrototype(): \Generator
 	{
 		yield '1' => 1;
 		yield '2' => 2;
 		yield '3' => 3;
 	}
+
+	function returnsIteratorNoPrototype(): \Iterator
+	{
+		yield 'test';
+	}
+
+	/**
+	 * @return \Iterator<array-key,string>
+	 */
+	function returnsIteratorWithPrototype(): \Iterator
+	{
+		yield 'test';
+	}
+
+	function returnsIteratorAggregateNoPrototype(): \IteratorAggregate
+	{
+		return new \ArrayObject([]);
+	}
+
+	/**
+	 * @return \IteratorAggregate<array-key,string>
+	 */
+	function returnsIteratorAggregateWithPrototype(): \IteratorAggregate
+	{
+		return new \ArrayObject([]);
+	}
+
+	function returnsTraversableNoPrototype(): \Traversable
+	{
+		yield 'test';
+	}
+
+	/**
+	 * @return \Traversable<array-key,string>
+	 */
+	function returnsTraversableWithPrototype(): \Traversable
+	{
+		yield 'test';
+	}
 }