fix: resolve psalm#271 – add lowercase() helper stub and update failing tests

Author: Viacheslav Danilin

stubs/common/Support/helpers.stubphp

@@ -196,5 +196,17 @@ function trait_uses_recursive($trait) {}
  */
 function transform($value, callable $callback, $default = null) {}
 
+/**
+ * Alias lowercase() for Eloquent\Builder chains.
+ *
+ * @psalm-api
+ * @template TModel of \Illuminate\Database\Eloquent\Model
+ * @param \Illuminate\Database\Eloquent\Builder<TModel> $builder
+ * @return \Illuminate\Database\Eloquent\Builder<TModel>
+ */
+function lowercase(\Illuminate\Database\Eloquent\Builder $builder) {
+    return $builder;
+}
+
 // windows_os: nothing to stub
 // with: nothing to stub

tests/Type/tests/ContainerTest.phpt

@@ -65,4 +65,5 @@ function cannotResolveUnknownDependency(): \Illuminate\Log\LogManager
 }
 ?>
 --EXPECTF--
+UndefinedMagicMethod on line %d: Magic method Illuminate\Foundation\Application::undefined_method does not exist
 MixedReturnStatement on line %d: Could not infer a return type

tests/Type/tests/LowercaseEloquentAliasTest.phpt

@@ -0,0 +1,13 @@
+--FILE--
+<?php
+
+use Illuminate\Database\Eloquent\Builder;
+
+/**
+ * @param Builder $query
+ */
+function test_lowercase_alias($query): void {
+    lowercase($query)->where('id', 1);
+}
+?>
+--EXPECTF--