Add tests for pure-callable

Author: mspirkov

tests/unit/TypeResolverTest.php

@@ -1165,6 +1165,14 @@ public function callableProvider(): array
                 'callable',
                 new Callable_(),
             ],
+            [
+                'pure-callable(int): int',
+                new Callable_(
+                    'pure-callable',
+                    [new CallableParameter(new Integer())],
+                    new Integer()
+                ),
+            ],
             [
                 'callable()',
                 new Callable_(),

tests/unit/Types/CallableTest.php

@@ -73,8 +73,12 @@ public static function provideToStringData(): array
                 new Callable_(),
             ],
             'pure' => [
-                'pure-callable',
-                new Callable_('pure-callable'),
+                'pure-callable(int): int',
+                new Callable_(
+                    'pure-callable',
+                    [new CallableParameter(new Integer())],
+                    new Integer()
+                ),
             ],
             'closure' => [
                 '\Closure',